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Carles Fernandez 2019-04-09 01:52:12 +02:00
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32 changed files with 1155 additions and 577 deletions
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2
README.md
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@ -578,7 +578,7 @@ $ sudo port install doxygen +docs
You also might need to activate a Python installation. The list of installed versions can be retrieved with:
~~~~~~
$ port select list python
$ port select --list python
~~~~~~
and you can activate a certain version by typing:

7
cmake/Modules/SetupPython.cmake
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@ -100,6 +100,13 @@ else()
gnsssdr_python_check_module("mako >= ${GNSSSDR_MAKO_MIN_VERSION}" mako "mako.__version__ >= '${GNSSSDR_MAKO_MIN_VERSION}'" MAKO_FOUND)
gnsssdr_python_check_module("six - python 2 and 3 compatibility library" six "True" SIX_FOUND)
endif()
if(NOT MAKO_FOUND OR NOT SIX_FOUND)
unset(PYTHON_EXECUTABLE)
find_package(PythonInterp ${GNSSSDR_PYTHON_MIN_VERSION})
gnsssdr_python_check_module("python >= ${GNSSSDR_PYTHON_MIN_VERSION}" sys "sys.version.split()[0] >= '${GNSSSDR_PYTHON_MIN_VERSION}'" PYTHON_MIN_VER_FOUND)
gnsssdr_python_check_module("mako >= ${GNSSSDR_MAKO_MIN_VERSION}" mako "mako.__version__ >= '${GNSSSDR_MAKO_MIN_VERSION}'" MAKO_FOUND)
gnsssdr_python_check_module("six - python 2 and 3 compatibility library" six "True" SIX_FOUND)
endif()
endif()
endif()

31
src/algorithms/acquisition/adapters/galileo_e1_pcps_ambiguous_acquisition_fpga.cc
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@ -44,6 +44,13 @@
#include <complex> // for complex
#include <cstring> // for memcpy
// the following flags are FPGA-specific and they are using arrange the values of the fft of the local code in the way the FPGA
// expects. This arrangement is done in the initialisation to avoid consuming unnecessary clock cycles during tracking.
#define QUANT_BITS_LOCAL_CODE 16
#define SELECT_LSBits 0x0000FFFF // Select the 10 LSbits out of a 20-bit word
#define SELECT_MSBbits 0xFFFF0000 // Select the 10 MSbits out of a 20-bit word
#define SELECT_ALL_CODE_BITS 0xFFFFFFFF // Select a 20 bit word
#define SHL_CODE_BITS 65536 // shift left by 10 bits
GalileoE1PcpsAmbiguousAcquisitionFpga::GalileoE1PcpsAmbiguousAcquisitionFpga(
ConfigurationInterface* configuration,
@ -67,7 +74,7 @@ GalileoE1PcpsAmbiguousAcquisitionFpga::GalileoE1PcpsAmbiguousAcquisitionFpga(
acq_parameters.repeat_satellite = configuration_->property(role + ".repeat_satellite", false);
DLOG(INFO) << role << " satellite repeat = " << acq_parameters.repeat_satellite;
float downsampling_factor = configuration_->property(role + ".downsampling_factor", 4.0);
uint32_t downsampling_factor = configuration_->property(role + ".downsampling_factor", 4);
acq_parameters.downsampling_factor = downsampling_factor;
fs_in = fs_in / downsampling_factor;
@ -97,15 +104,16 @@ GalileoE1PcpsAmbiguousAcquisitionFpga::GalileoE1PcpsAmbiguousAcquisitionFpga(
acq_parameters.device_name = device_name;
acq_parameters.samples_per_ms = nsamples_total / sampled_ms;
acq_parameters.samples_per_code = nsamples_total;
acq_parameters.excludelimit = static_cast<uint32_t>(std::round(static_cast<double>(fs_in) / GALILEO_E1_CODE_CHIP_RATE_HZ));
acq_parameters.excludelimit = static_cast<unsigned int>(1 + ceil((1.0 / GALILEO_E1_CODE_CHIP_RATE_HZ) * static_cast<float>(fs_in)));
// compute all the GALILEO E1 PRN Codes (this is done only once in the class constructor in order to avoid re-computing the PRN codes every time
// a channel is assigned)
auto* fft_if = new gr::fft::fft_complex(nsamples_total, true); // Direct FFT
auto* code = new std::complex<float>[nsamples_total]; // buffer for the local code
auto* fft_codes_padded = static_cast<gr_complex*>(volk_gnsssdr_malloc(nsamples_total * sizeof(gr_complex), volk_gnsssdr_get_alignment()));
d_all_fft_codes_ = new lv_16sc_t[nsamples_total * GALILEO_E1_NUMBER_OF_CODES]; // memory containing all the possible fft codes for PRN 0 to 32
d_all_fft_codes_ = new uint32_t[(nsamples_total * GALILEO_E1_NUMBER_OF_CODES)]; // memory containing all the possible fft codes for PRN 0 to 32
float max; // temporary maxima search
int32_t tmp, tmp2, local_code, fft_data;
for (uint32_t PRN = 1; PRN <= GALILEO_E1_NUMBER_OF_CODES; PRN++)
{
@ -153,17 +161,26 @@ GalileoE1PcpsAmbiguousAcquisitionFpga::GalileoE1PcpsAmbiguousAcquisitionFpga(
max = std::abs(fft_codes_padded[i].imag());
}
}
for (uint32_t i = 0; i < nsamples_total; i++) // map the FFT to the dynamic range of the fixed point values an copy to buffer containing all FFTs
// map the FFT to the dynamic range of the fixed point values an copy to buffer containing all FFTs
// and package codes in a format that is ready to be written to the FPGA
for (uint32_t i = 0; i < nsamples_total; i++)
{
d_all_fft_codes_[i + nsamples_total * (PRN - 1)] = lv_16sc_t(static_cast<int32_t>(floor(fft_codes_padded[i].real() * (pow(2, 9) - 1) / max)),
static_cast<int32_t>(floor(fft_codes_padded[i].imag() * (pow(2, 9) - 1) / max)));
tmp = static_cast<int32_t>(floor(fft_codes_padded[i].real() * (pow(2, QUANT_BITS_LOCAL_CODE - 1) - 1) / max));
tmp2 = static_cast<int32_t>(floor(fft_codes_padded[i].imag() * (pow(2, QUANT_BITS_LOCAL_CODE - 1) - 1) / max));
local_code = (tmp & SELECT_LSBits) | ((tmp2 * SHL_CODE_BITS) & SELECT_MSBbits); // put together the real part and the imaginary part
fft_data = local_code & SELECT_ALL_CODE_BITS;
d_all_fft_codes_[i + (nsamples_total * (PRN - 1))] = fft_data;
}
}
acq_parameters.all_fft_codes = d_all_fft_codes_;
acq_parameters.num_doppler_bins_step2 = configuration_->property(role + ".second_nbins", 4);
acq_parameters.doppler_step2 = configuration_->property(role + ".second_doppler_step", 125.0);
acq_parameters.make_2_steps = configuration_->property(role + ".make_two_steps", false);
acq_parameters.max_num_acqs = configuration_->property(role + ".max_num_acqs", 2);
// reference for the FPGA FFT-IFFT attenuation factor
acq_parameters.total_block_exp = configuration_->property(role + ".total_block_exp", 14);
acq_parameters.total_block_exp = configuration_->property(role + ".total_block_exp", 12);
acquisition_fpga_ = pcps_make_acquisition_fpga(acq_parameters);

2
src/algorithms/acquisition/adapters/galileo_e1_pcps_ambiguous_acquisition_fpga.h
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@ -166,7 +166,7 @@ private:
unsigned int in_streams_;
unsigned int out_streams_;
lv_16sc_t* d_all_fft_codes_; // memory that contains all the code ffts
uint32_t* d_all_fft_codes_; // memory that contains all the code ffts
};
#endif /* GNSS_SDR_GALILEO_E1_PCPS_AMBIGUOUS_ACQUISITION_FPGA_H_ */

32
src/algorithms/acquisition/adapters/galileo_e5a_pcps_acquisition_fpga.cc
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@ -44,6 +44,13 @@
#include <complex> // for complex
#include <cstring> // for strcpy, memcpy
// the following flags are FPGA-specific and they are using arrange the values of the fft of the local code in the way the FPGA
// expects. This arrangement is done in the initialisation to avoid consuming unnecessary clock cycles during tracking.
#define QUANT_BITS_LOCAL_CODE 16
#define SELECT_LSBits 0x0000FFFF // Select the 10 LSbits out of a 20-bit word
#define SELECT_MSBbits 0xFFFF0000 // Select the 10 MSbits out of a 20-bit word
#define SELECT_ALL_CODE_BITS 0xFFFFFFFF // Select a 20 bit word
#define SHL_CODE_BITS 65536 // shift left by 10 bits
GalileoE5aPcpsAcquisitionFpga::GalileoE5aPcpsAcquisitionFpga(ConfigurationInterface* configuration,
const std::string& role,
@ -64,7 +71,7 @@ GalileoE5aPcpsAcquisitionFpga::GalileoE5aPcpsAcquisitionFpga(ConfigurationInterf
acq_parameters.repeat_satellite = configuration_->property(role + ".repeat_satellite", false);
DLOG(INFO) << role << " satellite repeat = " << acq_parameters.repeat_satellite;
float downsampling_factor = configuration_->property(role + ".downsampling_factor", 1.0);
uint32_t downsampling_factor = configuration_->property(role + ".downsampling_factor", 1);
acq_parameters.downsampling_factor = downsampling_factor;
fs_in = fs_in / downsampling_factor;
@ -98,15 +105,17 @@ GalileoE5aPcpsAcquisitionFpga::GalileoE5aPcpsAcquisitionFpga(ConfigurationInterf
acq_parameters.samples_per_ms = nsamples_total / sampled_ms;
acq_parameters.samples_per_code = nsamples_total;
acq_parameters.excludelimit = static_cast<uint32_t>(ceil((1.0 / GALILEO_E5A_CODE_CHIP_RATE_HZ) * static_cast<float>(acq_parameters.fs_in)));
acq_parameters.excludelimit = static_cast<unsigned int>(1 + ceil((1.0 / GALILEO_E5A_CODE_CHIP_RATE_HZ) * static_cast<float>(fs_in)));
// compute all the GALILEO E5 PRN Codes (this is done only once in the class constructor in order to avoid re-computing the PRN codes every time
// a channel is assigned)
auto* fft_if = new gr::fft::fft_complex(nsamples_total, true); // Direct FFT
auto* code = new std::complex<float>[nsamples_total]; // buffer for the local code
auto* fft_codes_padded = static_cast<gr_complex*>(volk_gnsssdr_malloc(nsamples_total * sizeof(gr_complex), volk_gnsssdr_get_alignment()));
d_all_fft_codes_ = new lv_16sc_t[nsamples_total * GALILEO_E5A_NUMBER_OF_CODES]; // memory containing all the possible fft codes for PRN 0 to 32
d_all_fft_codes_ = new uint32_t[(nsamples_total * GALILEO_E5A_NUMBER_OF_CODES)]; // memory containing all the possible fft codes for PRN 0 to 32
float max; // temporary maxima search
int32_t tmp, tmp2, local_code, fft_data;
for (uint32_t PRN = 1; PRN <= GALILEO_E5A_NUMBER_OF_CODES; PRN++)
{
@ -154,18 +163,27 @@ GalileoE5aPcpsAcquisitionFpga::GalileoE5aPcpsAcquisitionFpga(ConfigurationInterf
max = std::abs(fft_codes_padded[i].imag());
}
}
for (uint32_t i = 0; i < nsamples_total; i++) // map the FFT to the dynamic range of the fixed point values an copy to buffer containing all FFTs
// map the FFT to the dynamic range of the fixed point values an copy to buffer containing all FFTs
// and package codes in a format that is ready to be written to the FPGA
for (uint32_t i = 0; i < nsamples_total; i++)
{
d_all_fft_codes_[i + nsamples_total * (PRN - 1)] = lv_16sc_t(static_cast<int32_t>(floor(fft_codes_padded[i].real() * (pow(2, 9) - 1) / max)),
static_cast<int32_t>(floor(fft_codes_padded[i].imag() * (pow(2, 9) - 1) / max)));
tmp = static_cast<int32_t>(floor(fft_codes_padded[i].real() * (pow(2, QUANT_BITS_LOCAL_CODE - 1) - 1) / max));
tmp2 = static_cast<int32_t>(floor(fft_codes_padded[i].imag() * (pow(2, QUANT_BITS_LOCAL_CODE - 1) - 1) / max));
local_code = (tmp & SELECT_LSBits) | ((tmp2 * SHL_CODE_BITS) & SELECT_MSBbits); // put together the real part and the imaginary part
fft_data = local_code & SELECT_ALL_CODE_BITS;
d_all_fft_codes_[i + (nsamples_total * (PRN - 1))] = fft_data;
}
}
acq_parameters.all_fft_codes = d_all_fft_codes_;
// reference for the FPGA FFT-IFFT attenuation factor
acq_parameters.total_block_exp = configuration_->property(role + ".total_block_exp", 14);
acq_parameters.total_block_exp = configuration_->property(role + ".total_block_exp", 13);
acq_parameters.num_doppler_bins_step2 = configuration_->property(role + ".second_nbins", 4);
acq_parameters.doppler_step2 = configuration_->property(role + ".second_doppler_step", 125.0);
acq_parameters.make_2_steps = configuration_->property(role + ".make_two_steps", false);
acq_parameters.max_num_acqs = configuration_->property(role + ".max_num_acqs", 2);
acquisition_fpga_ = pcps_make_acquisition_fpga(acq_parameters);
channel_ = 0;

2
src/algorithms/acquisition/adapters/galileo_e5a_pcps_acquisition_fpga.h
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@ -184,7 +184,7 @@ private:
Gnss_Synchro* gnss_synchro_;
lv_16sc_t* d_all_fft_codes_; // memory that contains all the code ffts
uint32_t* d_all_fft_codes_; // memory that contains all the code ffts
};
#endif /* GNSS_SDR_GALILEO_E5A_PCPS_ACQUISITION_FPGA_H_ */

36
src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition_fpga.cc
View File

@ -47,9 +47,15 @@
#include <complex> // for complex
#include <cstring> // for memcpy
#define NUM_PRNs 32
// the following flags are FPGA-specific and they are using arrange the values of the fft of the local code in the way the FPGA
// expects. This arrangement is done in the initialisation to avoid consuming unnecessary clock cycles during tracking.
#define QUANT_BITS_LOCAL_CODE 16
#define SELECT_LSBits 0x0000FFFF // Select the 10 LSbits out of a 20-bit word
#define SELECT_MSBbits 0xFFFF0000 // Select the 10 MSbits out of a 20-bit word
#define SELECT_ALL_CODE_BITS 0xFFFFFFFF // Select a 20 bit word
#define SHL_CODE_BITS 65536 // shift left by 10 bits
GpsL1CaPcpsAcquisitionFpga::GpsL1CaPcpsAcquisitionFpga(
ConfigurationInterface* configuration,
@ -71,9 +77,8 @@ GpsL1CaPcpsAcquisitionFpga::GpsL1CaPcpsAcquisitionFpga(
acq_parameters.repeat_satellite = configuration_->property(role + ".repeat_satellite", false);
DLOG(INFO) << role << " satellite repeat = " << acq_parameters.repeat_satellite;
float downsampling_factor = configuration_->property(role + ".downsampling_factor", 4.0);
uint32_t downsampling_factor = configuration_->property(role + ".downsampling_factor", 4);
acq_parameters.downsampling_factor = downsampling_factor;
fs_in = fs_in / downsampling_factor;
acq_parameters.fs_in = fs_in;
@ -94,7 +99,7 @@ GpsL1CaPcpsAcquisitionFpga::GpsL1CaPcpsAcquisitionFpga(
acq_parameters.device_name = device_name;
acq_parameters.samples_per_ms = nsamples_total / sampled_ms;
acq_parameters.samples_per_code = nsamples_total;
acq_parameters.excludelimit = static_cast<uint32_t>(std::round(static_cast<double>(fs_in) / GPS_L1_CA_CODE_RATE_HZ));
acq_parameters.excludelimit = static_cast<unsigned int>(1 + ceil(GPS_L1_CA_CHIP_PERIOD * static_cast<float>(fs_in)));
// compute all the GPS L1 PRN Codes (this is done only once upon the class constructor in order to avoid re-computing the PRN codes every time
// a channel is assigned)
@ -102,8 +107,10 @@ GpsL1CaPcpsAcquisitionFpga::GpsL1CaPcpsAcquisitionFpga(
// allocate memory to compute all the PRNs and compute all the possible codes
auto* code = new std::complex<float>[nsamples_total]; // buffer for the local code
auto* fft_codes_padded = static_cast<gr_complex*>(volk_gnsssdr_malloc(nsamples_total * sizeof(gr_complex), volk_gnsssdr_get_alignment()));
d_all_fft_codes_ = new lv_16sc_t[nsamples_total * NUM_PRNs]; // memory containing all the possible fft codes for PRN 0 to 32
float max; // temporary maxima search
d_all_fft_codes_ = new uint32_t[(nsamples_total * NUM_PRNs)]; // memory containing all the possible fft codes for PRN 0 to 32
float max;
int32_t tmp, tmp2, local_code, fft_data;
// temporary maxima search
for (uint32_t PRN = 1; PRN <= NUM_PRNs; PRN++)
{
gps_l1_ca_code_gen_complex_sampled(code, PRN, fs_in, 0); // generate PRN code
@ -135,10 +142,15 @@ GpsL1CaPcpsAcquisitionFpga::GpsL1CaPcpsAcquisitionFpga(
max = std::abs(fft_codes_padded[i].imag());
}
}
for (uint32_t i = 0; i < nsamples_total; i++) // map the FFT to the dynamic range of the fixed point values an copy to buffer containing all FFTs
// map the FFT to the dynamic range of the fixed point values an copy to buffer containing all FFTs
// and package codes in a format that is ready to be written to the FPGA
for (uint32_t i = 0; i < nsamples_total; i++)
{
d_all_fft_codes_[i + nsamples_total * (PRN - 1)] = lv_16sc_t(static_cast<int32_t>(floor(fft_codes_padded[i].real() * (pow(2, 9) - 1) / max)),
static_cast<int32_t>(floor(fft_codes_padded[i].imag() * (pow(2, 9) - 1) / max)));
tmp = static_cast<int32_t>(floor(fft_codes_padded[i].real() * (pow(2, QUANT_BITS_LOCAL_CODE - 1) - 1) / max));
tmp2 = static_cast<int32_t>(floor(fft_codes_padded[i].imag() * (pow(2, QUANT_BITS_LOCAL_CODE - 1) - 1) / max));
local_code = (tmp & SELECT_LSBits) | ((tmp2 * SHL_CODE_BITS) & SELECT_MSBbits); // put together the real part and the imaginary part
fft_data = local_code & SELECT_ALL_CODE_BITS;
d_all_fft_codes_[i + (nsamples_total * (PRN - 1))] = fft_data;
}
}
@ -146,8 +158,12 @@ GpsL1CaPcpsAcquisitionFpga::GpsL1CaPcpsAcquisitionFpga(
acq_parameters.all_fft_codes = d_all_fft_codes_;
// reference for the FPGA FFT-IFFT attenuation factor
acq_parameters.total_block_exp = configuration_->property(role + ".total_block_exp", 14);
acq_parameters.total_block_exp = configuration_->property(role + ".total_block_exp", 11);
acq_parameters.num_doppler_bins_step2 = configuration_->property(role + ".second_nbins", 4);
acq_parameters.doppler_step2 = configuration_->property(role + ".second_doppler_step", 125.0);
acq_parameters.make_2_steps = configuration_->property(role + ".make_two_steps", false);
acq_parameters.max_num_acqs = configuration_->property(role + ".max_num_acqs", 2);
acquisition_fpga_ = pcps_make_acquisition_fpga(acq_parameters);
channel_ = 0;

3
src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition_fpga.h
View File

@ -35,6 +35,7 @@
#ifndef GNSS_SDR_GPS_L1_CA_PCPS_ACQUISITION_FPGA_H_
#define GNSS_SDR_GPS_L1_CA_PCPS_ACQUISITION_FPGA_H_
#include "channel_fsm.h"
#include "pcps_acquisition_fpga.h"
#include <gnuradio/runtime_types.h> // for basic_block_sptr, top_block_sptr
@ -166,7 +167,7 @@ private:
std::string role_;
unsigned int in_streams_;
unsigned int out_streams_;
lv_16sc_t* d_all_fft_codes_; // memory that contains all the code ffts
uint32_t* d_all_fft_codes_; // memory that contains all the code ffts
};
#endif /* GNSS_SDR_GPS_L1_CA_PCPS_ACQUISITION_FPGA_H_ */

25
src/algorithms/acquisition/adapters/gps_l2_m_pcps_acquisition_fpga.cc
View File

@ -47,7 +47,11 @@
#include <cstring> // for memcpy
#define NUM_PRNs 32
#define QUANT_BITS_LOCAL_CODE 16
#define SELECT_LSBits 0x0000FFFF // Select the 10 LSbits out of a 20-bit word
#define SELECT_MSBbits 0xFFFF0000 // Select the 10 MSbits out of a 20-bit word
#define SELECT_ALL_CODE_BITS 0xFFFFFFFF // Select a 20 bit word
#define SHL_CODE_BITS 65536 // shift left by 10 bits
GpsL2MPcpsAcquisitionFpga::GpsL2MPcpsAcquisitionFpga(
ConfigurationInterface* configuration,
@ -102,8 +106,11 @@ GpsL2MPcpsAcquisitionFpga::GpsL2MPcpsAcquisitionFpga(
// allocate memory to compute all the PRNs and compute all the possible codes
auto* code = new std::complex<float>[nsamples_total]; // buffer for the local code
auto* fft_codes_padded = static_cast<gr_complex*>(volk_gnsssdr_malloc(nsamples_total * sizeof(gr_complex), volk_gnsssdr_get_alignment()));
d_all_fft_codes_ = new lv_16sc_t[nsamples_total * NUM_PRNs]; // memory containing all the possible fft codes for PRN 0 to 32
//d_all_fft_codes_ = new lv_16sc_t[nsamples_total * NUM_PRNs]; // memory containing all the possible fft codes for PRN 0 to 32
d_all_fft_codes_ = new uint32_t[(nsamples_total * NUM_PRNs)]; // memory containing all the possible fft codes for PRN 0 to 32
float max; // temporary maxima search
int32_t tmp, tmp2, local_code, fft_data;
for (unsigned int PRN = 1; PRN <= NUM_PRNs; PRN++)
{
gps_l2c_m_code_gen_complex_sampled(code, PRN, fs_in_);
@ -127,10 +134,18 @@ GpsL2MPcpsAcquisitionFpga::GpsL2MPcpsAcquisitionFpga(
max = std::abs(fft_codes_padded[i].imag());
}
}
for (unsigned int i = 0; i < nsamples_total; i++) // map the FFT to the dynamic range of the fixed point values an copy to buffer containing all FFTs
// map the FFT to the dynamic range of the fixed point values an copy to buffer containing all FFTs
// and package codes in a format that is ready to be written to the FPGA
for (uint32_t i = 0; i < nsamples_total; i++)
{
d_all_fft_codes_[i + nsamples_total * (PRN - 1)] = lv_16sc_t(static_cast<int>(floor(fft_codes_padded[i].real() * (pow(2, 7) - 1) / max)),
static_cast<int>(floor(fft_codes_padded[i].imag() * (pow(2, 7) - 1) / max)));
tmp = static_cast<int32_t>(floor(fft_codes_padded[i].real() * (pow(2, QUANT_BITS_LOCAL_CODE - 1) - 1) / max));
tmp2 = static_cast<int32_t>(floor(fft_codes_padded[i].imag() * (pow(2, QUANT_BITS_LOCAL_CODE - 1) - 1) / max));
local_code = (tmp & SELECT_LSBits) | ((tmp2 * SHL_CODE_BITS) & SELECT_MSBbits); // put together the real part and the imaginary part
fft_data = local_code & SELECT_ALL_CODE_BITS;
d_all_fft_codes_[i + (nsamples_total * (PRN - 1))] = fft_data;
// d_all_fft_codes_[i + nsamples_total * (PRN - 1)] = lv_16sc_t(static_cast<int32_t>(floor(fft_codes_padded[i].real() * (pow(2, QUANT_BITS_LOCAL_CODE - 1) - 1) / max)),
// static_cast<int32_t>(floor(fft_codes_padded[i].imag() * (pow(2, QUANT_BITS_LOCAL_CODE - 1) - 1) / max)));
}
}

2
src/algorithms/acquisition/adapters/gps_l2_m_pcps_acquisition_fpga.h
View File

@ -169,7 +169,7 @@ private:
unsigned int in_streams_;
unsigned int out_streams_;
lv_16sc_t* d_all_fft_codes_; // memory that contains all the code ffts
uint32_t* d_all_fft_codes_; // memory that contains all the code ffts
//float calculate_threshold(float pfa);
};

33
src/algorithms/acquisition/adapters/gps_l5i_pcps_acquisition_fpga.cc
View File

@ -49,6 +49,14 @@
#define NUM_PRNs 32
// the following flags are FPGA-specific and they are using arrange the values of the fft of the local code in the way the FPGA
// expects. This arrangement is done in the initialisation to avoid consuming unnecessary clock cycles during tracking.
#define QUANT_BITS_LOCAL_CODE 16
#define SELECT_LSBits 0x0000FFFF // Select the 10 LSbits out of a 20-bit word
#define SELECT_MSBbits 0xFFFF0000 // Select the 10 MSbits out of a 20-bit word
#define SELECT_ALL_CODE_BITS 0xFFFFFFFF // Select a 20 bit word
#define SHL_CODE_BITS 65536 // shift left by 10 bits
GpsL5iPcpsAcquisitionFpga::GpsL5iPcpsAcquisitionFpga(
ConfigurationInterface* configuration,
@ -70,7 +78,7 @@ GpsL5iPcpsAcquisitionFpga::GpsL5iPcpsAcquisitionFpga(
acq_parameters.repeat_satellite = configuration_->property(role + ".repeat_satellite", false);
DLOG(INFO) << role << " satellite repeat = " << acq_parameters.repeat_satellite;
float downsampling_factor = configuration_->property(role + ".downsampling_factor", 1.0);
uint32_t downsampling_factor = configuration_->property(role + ".downsampling_factor", 1);
acq_parameters.downsampling_factor = downsampling_factor;
fs_in = fs_in / downsampling_factor;
@ -96,16 +104,18 @@ GpsL5iPcpsAcquisitionFpga::GpsL5iPcpsAcquisitionFpga(
acq_parameters.samples_per_ms = nsamples_total / sampled_ms;
acq_parameters.samples_per_code = nsamples_total;
acq_parameters.excludelimit = static_cast<uint32_t>(ceil((1.0 / GPS_L5I_CODE_RATE_HZ) * static_cast<float>(acq_parameters.fs_in)));
acq_parameters.excludelimit = static_cast<unsigned int>(1 + ceil((1.0 / GPS_L5I_CODE_RATE_HZ) * static_cast<float>(fs_in)));
// compute all the GPS L5 PRN Codes (this is done only once upon the class constructor in order to avoid re-computing the PRN codes every time
// a channel is assigned)
auto* fft_if = new gr::fft::fft_complex(nsamples_total, true); // Direct FFT
auto* code = new gr_complex[nsamples_total];
auto* fft_codes_padded = static_cast<gr_complex*>(volk_gnsssdr_malloc(nsamples_total * sizeof(gr_complex), volk_gnsssdr_get_alignment()));
d_all_fft_codes_ = new lv_16sc_t[nsamples_total * NUM_PRNs]; // memory containing all the possible fft codes for PRN 0 to 32
d_all_fft_codes_ = new uint32_t[(nsamples_total * NUM_PRNs)]; // memory containing all the possible fft codes for PRN 0 to 32
float max; // temporary maxima search
int32_t tmp, tmp2, local_code, fft_data;
for (uint32_t PRN = 1; PRN <= NUM_PRNs; PRN++)
{
gps_l5i_code_gen_complex_sampled(code, PRN, fs_in);
@ -136,18 +146,27 @@ GpsL5iPcpsAcquisitionFpga::GpsL5iPcpsAcquisitionFpga(
max = std::abs(fft_codes_padded[i].imag());
}
}
for (uint32_t i = 0; i < nsamples_total; i++) // map the FFT to the dynamic range of the fixed point values an copy to buffer containing all FFTs
// map the FFT to the dynamic range of the fixed point values an copy to buffer containing all FFTs
// and package codes in a format that is ready to be written to the FPGA
for (uint32_t i = 0; i < nsamples_total; i++)
{
d_all_fft_codes_[i + nsamples_total * (PRN - 1)] = lv_16sc_t(static_cast<int32_t>(floor(fft_codes_padded[i].real() * (pow(2, 9) - 1) / max)),
static_cast<int32_t>(floor(fft_codes_padded[i].imag() * (pow(2, 9) - 1) / max)));
tmp = static_cast<int32_t>(floor(fft_codes_padded[i].real() * (pow(2, QUANT_BITS_LOCAL_CODE - 1) - 1) / max));
tmp2 = static_cast<int32_t>(floor(fft_codes_padded[i].imag() * (pow(2, QUANT_BITS_LOCAL_CODE - 1) - 1) / max));
local_code = (tmp & SELECT_LSBits) | ((tmp2 * SHL_CODE_BITS) & SELECT_MSBbits); // put together the real part and the imaginary part
fft_data = local_code & SELECT_ALL_CODE_BITS;
d_all_fft_codes_[i + (nsamples_total * (PRN - 1))] = fft_data;
}
}
acq_parameters.all_fft_codes = d_all_fft_codes_;
// reference for the FPGA FFT-IFFT attenuation factor
acq_parameters.total_block_exp = configuration_->property(role + ".total_block_exp", 14);
acq_parameters.total_block_exp = configuration_->property(role + ".total_block_exp", 11);
acq_parameters.num_doppler_bins_step2 = configuration_->property(role + ".second_nbins", 4);
acq_parameters.doppler_step2 = configuration_->property(role + ".second_doppler_step", 125.0);
acq_parameters.make_2_steps = configuration_->property(role + ".make_two_steps", false);
acq_parameters.max_num_acqs = configuration_->property(role + ".max_num_acqs", 2);
acquisition_fpga_ = pcps_make_acquisition_fpga(acq_parameters);
channel_ = 0;

3
src/algorithms/acquisition/adapters/gps_l5i_pcps_acquisition_fpga.h
View File

@ -106,6 +106,7 @@ public:
channel_fsm_ = channel_fsm;
acquisition_fpga_->set_channel_fsm(channel_fsm);
}
/*!
* \brief Set statistics threshold of PCPS algorithm
*/
@ -167,7 +168,7 @@ private:
unsigned int in_streams_;
unsigned int out_streams_;
lv_16sc_t* d_all_fft_codes_; // memory that contains all the code ffts
uint32_t* d_all_fft_codes_; // memory that contains all the code ffts
float calculate_threshold(float pfa);
};

141
src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition_fpga.cc
View File

@ -34,6 +34,7 @@
#include "pcps_acquisition_fpga.h"
#include "gnss_synchro.h"
//#include <boost/chrono.hpp>
#include <glog/logging.h>
#include <cmath> // for ceil
#include <iostream> // for operator<<
@ -42,7 +43,6 @@
#define AQ_DOWNSAMPLING_DELAY 40 // delay due to the downsampling filter in the acquisition
pcps_acquisition_fpga_sptr pcps_make_acquisition_fpga(pcpsconf_fpga_t conf_)
{
return pcps_acquisition_fpga_sptr(new pcps_acquisition_fpga(std::move(conf_)));
@ -52,7 +52,7 @@ pcps_acquisition_fpga_sptr pcps_make_acquisition_fpga(pcpsconf_fpga_t conf_)
pcps_acquisition_fpga::pcps_acquisition_fpga(pcpsconf_fpga_t conf_)
{
acq_parameters = std::move(conf_);
d_sample_counter = 0ULL; // SAMPLE COUNTER
d_sample_counter = 0ULL; // Sample Counter
d_active = false;
d_state = 0;
d_fft_size = acq_parameters.samples_per_code;
@ -71,6 +71,15 @@ pcps_acquisition_fpga::pcps_acquisition_fpga(pcpsconf_fpga_t conf_)
d_total_block_exp = acq_parameters.total_block_exp;
d_make_2_steps = acq_parameters.make_2_steps;
d_num_doppler_bins_step2 = acq_parameters.num_doppler_bins_step2;
d_doppler_step2 = acq_parameters.doppler_step2;
d_doppler_center_step_two = 0.0;
d_doppler_max = acq_parameters.doppler_max;
d_max_num_acqs = acq_parameters.max_num_acqs;
acquisition_fpga = std::make_shared<Fpga_Acquisition>(acq_parameters.device_name, acq_parameters.code_length, acq_parameters.doppler_max, d_fft_size,
acq_parameters.fs_in, acq_parameters.sampled_ms, acq_parameters.select_queue_Fpga, acq_parameters.all_fft_codes, acq_parameters.excludelimit);
}
@ -100,9 +109,7 @@ void pcps_acquisition_fpga::init()
d_mag = 0.0;
d_input_power = 0.0;
d_num_doppler_bins = static_cast<uint32_t>(std::ceil(static_cast<double>(static_cast<int32_t>(acq_parameters.doppler_max) - static_cast<int32_t>(-acq_parameters.doppler_max)) / static_cast<double>(d_doppler_step))) + 1;
acquisition_fpga->init();
d_num_doppler_bins = static_cast<uint32_t>(std::ceil(static_cast<double>(static_cast<int32_t>(d_doppler_max) - static_cast<int32_t>(-d_doppler_max)) / static_cast<double>(d_doppler_step))) + 1;
}
@ -171,48 +178,35 @@ void pcps_acquisition_fpga::send_negative_acquisition()
}
}
void pcps_acquisition_fpga::set_active(bool active)
void pcps_acquisition_fpga::acquisition_core(uint32_t num_doppler_bins, uint32_t doppler_step, int32_t doppler_min)
{
d_active = active;
// initialize acquisition algorithm
uint32_t indext = 0U;
float firstpeak = 0.0;
float secondpeak = 0.0;
uint32_t total_block_exp;
d_input_power = 0.0;
d_mag = 0.0;
int32_t doppler;
DLOG(INFO) << "Channel: " << d_channel
<< " , doing acquisition of satellite: " << d_gnss_synchro->System << " " << d_gnss_synchro->PRN
<< " ,sample stamp: " << d_sample_counter << ", threshold: "
<< d_threshold << ", doppler_max: " << acq_parameters.doppler_max
<< ", doppler_step: " << d_doppler_step
// no CFAR algorithm in the FPGA
<< ", use_CFAR_algorithm_flag: false";
uint64_t initial_sample;
acquisition_fpga->configure_acquisition();
acquisition_fpga->set_doppler_sweep(d_num_doppler_bins);
acquisition_fpga->write_local_code();
acquisition_fpga->set_block_exp(d_total_block_exp);
int32_t doppler;
acquisition_fpga->set_doppler_sweep(num_doppler_bins, doppler_step, doppler_min);
acquisition_fpga->run_acquisition();
acquisition_fpga->read_acquisition_results(&indext, &firstpeak, &secondpeak, &initial_sample, &d_input_power, &d_doppler_index, &total_block_exp);
acquisition_fpga->read_acquisition_results(&indext,
&firstpeak,
&secondpeak,
&initial_sample,
&d_input_power,
&d_doppler_index,
&total_block_exp);
doppler = static_cast<int32_t>(doppler_min) + doppler_step * (d_doppler_index - 1);
if (total_block_exp > d_total_block_exp)
{
// if the attenuation factor of the FPGA FFT-IFFT is smaller than the reference attenuation factor then we need to update the reference attenuation factor
std::cout << "changing blk exp..... d_total_block_exp = " << d_total_block_exp << " total_block_exp = " << total_block_exp << " chan = " << d_channel << std::endl;
d_total_block_exp = total_block_exp;
d_test_statistics = 0;
}
doppler = -static_cast<int32_t>(acq_parameters.doppler_max) + d_doppler_step * (d_doppler_index - 1);
else
{
if (secondpeak > 0)
{
d_test_statistics = firstpeak / secondpeak;
@ -221,6 +215,14 @@ void pcps_acquisition_fpga::set_active(bool active)
{
d_test_statistics = 0.0;
}
}
// debug
// if (d_test_statistics > d_threshold)
// {
// printf("firstpeak = %f, secondpeak = %f, test_statistics = %f reported block exp = %d PRN = %d inext = %d, initial_sample = %ld doppler = %d\n", firstpeak, secondpeak, d_test_statistics, (int)total_block_exp, (int)d_gnss_synchro->PRN, (int)indext, (long int)initial_sample, (int)doppler);
// printf("doppler_min = %d doppler_step = %d num_doppler_bins = %d\n", (int)doppler_min, (int)doppler_step, (int)num_doppler_bins);
// }
d_gnss_synchro->Acq_doppler_hz = static_cast<double>(doppler);
d_sample_counter = initial_sample;
@ -230,7 +232,7 @@ void pcps_acquisition_fpga::set_active(bool active)
if (d_downsampling_factor > 1)
{
d_gnss_synchro->Acq_delay_samples = static_cast<double>(d_downsampling_factor * (indext));
d_gnss_synchro->Acq_samplestamp_samples = d_downsampling_factor * d_sample_counter - 44; //33; //41; //+ 81*0.5; // delay due to the downsampling filter in the acquisition
d_gnss_synchro->Acq_samplestamp_samples = d_downsampling_factor * static_cast<uint64_t>(d_sample_counter) - static_cast<uint64_t>(44); //33; //41; //+ 81*0.5; // delay due to the downsampling filter in the acquisition
}
else
{
@ -243,7 +245,34 @@ void pcps_acquisition_fpga::set_active(bool active)
d_gnss_synchro->Acq_delay_samples = static_cast<double>(indext);
d_gnss_synchro->Acq_samplestamp_samples = d_sample_counter; // delay due to the downsampling filter in the acquisition
}
}
void pcps_acquisition_fpga::set_active(bool active)
{
d_active = active;
d_input_power = 0.0;
d_mag = 0.0;
DLOG(INFO) << "Channel: " << d_channel
<< " , doing acquisition of satellite: " << d_gnss_synchro->System << " " << d_gnss_synchro->PRN
<< " ,sample stamp: " << d_sample_counter << ", threshold: "
<< d_threshold << ", doppler_max: " << d_doppler_max
<< ", doppler_step: " << d_doppler_step
// no CFAR algorithm in the FPGA
<< ", use_CFAR_algorithm_flag: false";
acquisition_fpga->open_device();
acquisition_fpga->configure_acquisition();
acquisition_fpga->write_local_code();
acquisition_fpga->set_block_exp(d_total_block_exp);
acquisition_core(d_num_doppler_bins, d_doppler_step, -d_doppler_max);
if (!d_make_2_steps)
{
acquisition_fpga->close_device();
if (d_test_statistics > d_threshold)
{
d_active = false;
@ -256,17 +285,49 @@ void pcps_acquisition_fpga::set_active(bool active)
d_active = false;
send_negative_acquisition();
}
}
else
{
if (d_test_statistics > d_threshold)
{
d_doppler_center_step_two = static_cast<float>(d_gnss_synchro->Acq_doppler_hz);
uint32_t num_second_acq = 1;
while (num_second_acq < d_max_num_acqs)
{
acquisition_core(d_num_doppler_bins_step2, d_doppler_step2, d_doppler_center_step_two - static_cast<float>(floor(d_num_doppler_bins_step2 / 2.0)) * d_doppler_step2);
if (d_test_statistics > d_threshold)
{
d_active = false;
send_positive_acquisition();
d_state = 0; // Positive acquisition
break;
}
num_second_acq = num_second_acq + 1;
}
if (d_test_statistics <= d_threshold)
{
d_state = 0;
d_active = false;
send_negative_acquisition();
}
}
else
{
acquisition_fpga->close_device();
d_state = 0;
d_active = false;
send_negative_acquisition();
}
}
}
void pcps_acquisition_fpga::reset_acquisition(void)
{
// this function triggers a HW reset of the FPGA PL.
acquisition_fpga->open_device();
acquisition_fpga->reset_acquisition();
}
void pcps_acquisition_fpga::read_fpga_total_scale_factor(uint32_t* total_scale_factor, uint32_t* fw_scale_factor)
{
acquisition_fpga->read_fpga_total_scale_factor(total_scale_factor, fw_scale_factor);
acquisition_fpga->close_device();
}

29
src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition_fpga.h
View File

@ -62,11 +62,16 @@ typedef struct
int32_t code_length;
uint32_t select_queue_Fpga;
std::string device_name;
lv_16sc_t* all_fft_codes; // memory that contains all the code ffts
float downsampling_factor;
uint32_t* all_fft_codes; // pointer to memory that contains all the code ffts
//float downsampling_factor;
uint32_t downsampling_factor;
uint32_t total_block_exp;
uint32_t excludelimit;
bool make_2_steps;
uint32_t num_doppler_bins_step2;
float doppler_step2;
bool repeat_satellite;
uint32_t max_num_acqs;
} pcpsconf_fpga_t;
class pcps_acquisition_fpga;
@ -95,6 +100,8 @@ private:
float first_vs_second_peak_statistic(uint32_t& indext, int32_t& doppler, uint32_t num_doppler_bins, int32_t doppler_max, int32_t doppler_step);
void acquisition_core(uint32_t num_doppler_bins, uint32_t doppler_step, int32_t doppler_max);
pcpsconf_fpga_t acq_parameters;
bool d_active;
float d_threshold;
@ -106,17 +113,25 @@ private:
uint32_t d_channel;
std::shared_ptr<ChannelFsm> d_channel_fsm;
uint32_t d_doppler_step;
uint32_t d_doppler_max;
uint32_t d_fft_size;
uint32_t d_num_doppler_bins;
uint64_t d_sample_counter;
Gnss_Synchro* d_gnss_synchro;
std::shared_ptr<Fpga_Acquisition> acquisition_fpga;
float d_downsampling_factor;
//float d_downsampling_factor;
uint32_t d_downsampling_factor;
uint32_t d_select_queue_Fpga;
uint32_t d_total_block_exp;
bool d_make_2_steps;
uint32_t d_num_doppler_bins_step2;
float d_doppler_step2;
float d_doppler_center_step_two;
uint32_t d_max_num_acqs;
public:
~pcps_acquisition_fpga();
@ -172,7 +187,6 @@ public:
d_channel = channel;
}
/*!
* \brief Set channel fsm associated to this acquisition instance
*/
@ -197,7 +211,7 @@ public:
*/
inline void set_doppler_max(uint32_t doppler_max)
{
acq_parameters.doppler_max = doppler_max;
d_doppler_max = doppler_max;
acquisition_fpga->set_doppler_max(doppler_max);
}
@ -215,11 +229,6 @@ public:
* \brief This funciton triggers a HW reset of the FPGA PL.
*/
void reset_acquisition(void);
/*!
* \brief This funciton is only used for the unit tests
*/
void read_fpga_total_scale_factor(uint32_t* total_scale_factor, uint32_t* fw_scale_factor);
};
#endif /* GNSS_SDR_PCPS_ACQUISITION_FPGA_H_*/

126
src/algorithms/acquisition/libs/fpga_acquisition.cc
View File

@ -46,22 +46,19 @@
// FPGA register parameters
#define PAGE_SIZE 0x10000 // default page size for the multicorrelator memory map
#define MAX_PHASE_STEP_RAD 0.999999999534339 // 1 - pow(2,-31);
#define RESET_ACQUISITION 2 // command to reset the multicorrelator
#define LAUNCH_ACQUISITION 1 // command to launch the multicorrelator
#define TEST_REG_SANITY_CHECK 0x55AA // value to check the presence of the test register (to detect the hw)
#define LOCAL_CODE_CLEAR_MEM 0x10000000 // command to clear the internal memory of the multicorrelator
#define MEM_LOCAL_CODE_WR_ENABLE 0x0C000000 // command to enable the ENA and WR pins of the internal memory of the multicorrelator
#define POW_2_2 4 // 2^2 (used for the conversion of floating point numbers to integers)
#define POW_2_29 536870912 // 2^29 (used for the conversion of floating point numbers to integers)
#define SELECT_LSB 0x00FF // value to select the least significant byte
#define SELECT_MSB 0XFF00 // value to select the most significant byte
#define SELECT_16_BITS 0xFFFF // value to select 16 bits
#define SHL_8_BITS 256 // value used to shift a value 8 bits to the left
#define SELECT_LSBits 0x000003FF // Select the 10 LSbits out of a 20-bit word
#define SELECT_MSBbits 0x000FFC00 // Select the 10 MSbits out of a 20-bit word
#define SELECT_ALL_CODE_BITS 0x000FFFFF // Select a 20 bit word
#define SHL_CODE_BITS 1024 // shift left by 10 bits
#define POW_2_31 2147483648 // 2^31 (used for the conversion of floating point numbers to integers)
#define SELECT_LSBits 0x0000FFFF // Select the 10 LSbits out of a 20-bit word
#define SELECT_MSBbits 0xFFFF0000 // Select the 10 MSbits out of a 20-bit word
#define SELECT_ALL_CODE_BITS 0xFFFFFFFF // Select a 20 bit word
#define SHL_CODE_BITS 65536 // shift left by 10 bits
#ifndef TEMP_FAILURE_RETRY
#define TEMP_FAILURE_RETRY(exp) \
@ -84,7 +81,8 @@ Fpga_Acquisition::Fpga_Acquisition(std::string device_name,
int64_t fs_in,
uint32_t sampled_ms __attribute__((unused)),
uint32_t select_queue,
lv_16sc_t *all_fft_codes,
//lv_16sc_t *all_fft_codes,
uint32_t *all_fft_codes,
uint32_t excludelimit)
{
uint32_t vector_length = nsamples_total;
@ -102,12 +100,10 @@ Fpga_Acquisition::Fpga_Acquisition(std::string device_name,
d_fd = 0; // driver descriptor
d_map_base = nullptr; // driver memory map
d_all_fft_codes = all_fft_codes;
Fpga_Acquisition::reset_acquisition();
Fpga_Acquisition::open_device();
Fpga_Acquisition::reset_acquisition();
Fpga_Acquisition::fpga_acquisition_test_register();
Fpga_Acquisition::close_device();
d_PRN = 0;
DLOG(INFO) << "Acquisition FPGA class created";
}
@ -116,12 +112,6 @@ Fpga_Acquisition::Fpga_Acquisition(std::string device_name,
Fpga_Acquisition::~Fpga_Acquisition() = default;
bool Fpga_Acquisition::init()
{
return true;
}
bool Fpga_Acquisition::set_local_code(uint32_t PRN)
{
// select the code with the chosen PRN
@ -132,8 +122,12 @@ bool Fpga_Acquisition::set_local_code(uint32_t PRN)
void Fpga_Acquisition::write_local_code()
{
Fpga_Acquisition::fpga_configure_acquisition_local_code(
&d_all_fft_codes[d_nsamples_total * (d_PRN - 1)]);
d_map_base[9] = LOCAL_CODE_CLEAR_MEM;
// write local code
for (uint32_t k = 0; k < d_vector_length; k++)
{
d_map_base[6] = d_all_fft_codes[d_nsamples_total * (d_PRN - 1) + k];
}
}
@ -184,26 +178,6 @@ void Fpga_Acquisition::fpga_acquisition_test_register()
}
void Fpga_Acquisition::fpga_configure_acquisition_local_code(lv_16sc_t fft_local_code[])
{
uint32_t local_code;
uint32_t k, tmp, tmp2;
uint32_t fft_data;
d_map_base[9] = LOCAL_CODE_CLEAR_MEM;
// write local code
for (k = 0; k < d_vector_length; k++)
{
tmp = fft_local_code[k].real();
tmp2 = fft_local_code[k].imag();
local_code = (tmp & SELECT_LSBits) | ((tmp2 * SHL_CODE_BITS) & SELECT_MSBbits); // put together the real part and the imaginary part
fft_data = local_code & SELECT_ALL_CODE_BITS;
d_map_base[6] = fft_data;
}
}
void Fpga_Acquisition::run_acquisition(void)
{
// enable interrupts
@ -241,47 +215,30 @@ void Fpga_Acquisition::set_block_exp(uint32_t total_block_exp)
d_map_base[11] = total_block_exp;
}
void Fpga_Acquisition::set_doppler_sweep(uint32_t num_sweeps)
void Fpga_Acquisition::set_doppler_sweep(uint32_t num_sweeps, uint32_t doppler_step, int32_t doppler_min)
{
float phase_step_rad_real;
float phase_step_rad_int_temp;
int32_t phase_step_rad_int;
auto doppler = static_cast<int32_t>(-d_doppler_max);
float phase_step_rad = GPS_TWO_PI * (doppler) / static_cast<float>(d_fs_in);
// The doppler step can never be outside the range -pi to +pi, otherwise there would be aliasing
// The FPGA expects phase_step_rad between -1 (-pi) to +1 (+pi)
// The FPGA also expects the phase to be negative since it produces cos(x) -j*sin(x)
phase_step_rad_real = phase_step_rad / (GPS_TWO_PI / 2);
// avoid saturation of the fixed point representation in the fpga
// (only the positive value can saturate due to the 2's complement representation)
if (phase_step_rad_real >= 1.0)
{
phase_step_rad_real = MAX_PHASE_STEP_RAD;
}
phase_step_rad_int_temp = phase_step_rad_real * POW_2_2; // * 2^2
phase_step_rad_int = static_cast<int32_t>(phase_step_rad_int_temp * (POW_2_29)); // * 2^29 (in total it makes x2^31 in two steps to avoid the warnings
phase_step_rad_real = 2.0 * (doppler_min) / static_cast<float>(d_fs_in);
phase_step_rad_int = static_cast<int32_t>(phase_step_rad_real * (POW_2_31));
d_map_base[3] = phase_step_rad_int;
// repeat the calculation with the doppler step
doppler = static_cast<int32_t>(d_doppler_step);
phase_step_rad = GPS_TWO_PI * (doppler) / static_cast<float>(d_fs_in);
phase_step_rad_real = phase_step_rad / (GPS_TWO_PI / 2);
if (phase_step_rad_real >= 1.0)
{
phase_step_rad_real = MAX_PHASE_STEP_RAD;
}
phase_step_rad_int_temp = phase_step_rad_real * POW_2_2; // * 2^2
phase_step_rad_int = static_cast<int32_t>(phase_step_rad_int_temp * (POW_2_29)); // * 2^29 (in total it makes x2^31 in two steps to avoid the warnings
phase_step_rad_real = 2.0 * (doppler_step) / static_cast<float>(d_fs_in);
phase_step_rad_int = static_cast<int32_t>(phase_step_rad_real * (POW_2_31)); // * 2^29 (in total it makes x2^31 in two steps to avoid the warnings
d_map_base[4] = phase_step_rad_int;
// write number of doppler sweeps
d_map_base[5] = num_sweeps;
}
void Fpga_Acquisition::configure_acquisition()
{
Fpga_Acquisition::open_device();
//Fpga_Acquisition::open_device();
d_map_base[0] = d_select_queue;
d_map_base[1] = d_vector_length;
@ -291,30 +248,6 @@ void Fpga_Acquisition::configure_acquisition()
}
void Fpga_Acquisition::set_phase_step(uint32_t doppler_index)
{
float phase_step_rad_real;
float phase_step_rad_int_temp;
int32_t phase_step_rad_int;
int32_t doppler = -static_cast<int32_t>(d_doppler_max) + d_doppler_step * doppler_index;
float phase_step_rad = GPS_TWO_PI * (doppler) / static_cast<float>(d_fs_in);
// The doppler step can never be outside the range -pi to +pi, otherwise there would be aliasing
// The FPGA expects phase_step_rad between -1 (-pi) to +1 (+pi)
// The FPGA also expects the phase to be negative since it produces cos(x) -j*sin(x)
// while the gnss-sdr software (volk_gnsssdr_s32f_sincos_32fc) generates cos(x) + j*sin(x)
phase_step_rad_real = phase_step_rad / (GPS_TWO_PI / 2);
// avoid saturation of the fixed point representation in the fpga
// (only the positive value can saturate due to the 2's complement representation)
if (phase_step_rad_real >= 1.0)
{
phase_step_rad_real = MAX_PHASE_STEP_RAD;
}
phase_step_rad_int_temp = phase_step_rad_real * POW_2_2; // * 2^2
phase_step_rad_int = static_cast<int32_t>(phase_step_rad_int_temp * (POW_2_29)); // * 2^29 (in total it makes x2^31 in two steps to avoid the warnings
d_map_base[3] = phase_step_rad_int;
}
void Fpga_Acquisition::read_acquisition_results(uint32_t *max_index,
float *firstpeak, float *secondpeak, uint64_t *initial_sample, float *power_sum, uint32_t *doppler_index, uint32_t *total_blk_exp)
{
@ -349,9 +282,7 @@ void Fpga_Acquisition::read_acquisition_results(uint32_t *max_index,
readval = d_map_base[7]; // read doppler index -- this read releases the interrupt line
*doppler_index = readval;
readval = d_map_base[15]; // read dummy
Fpga_Acquisition::close_device();
readval = d_map_base[15]; // read dummy (to be removed)
}
@ -380,9 +311,7 @@ void Fpga_Acquisition::close_device()
void Fpga_Acquisition::reset_acquisition(void)
{
Fpga_Acquisition::open_device();
d_map_base[8] = RESET_ACQUISITION; // writing a 2 to d_map_base[8] resets the multicorrelator
Fpga_Acquisition::close_device();
}
@ -392,8 +321,7 @@ void Fpga_Acquisition::read_fpga_total_scale_factor(uint32_t *total_scale_factor
uint32_t readval = 0;
readval = d_map_base[8];
*total_scale_factor = readval;
//readval = d_map_base[8];
// only the total scale factor is used for the tests (fw scale factor to be removed)
*fw_scale_factor = 0;
}

10
src/algorithms/acquisition/libs/fpga_acquisition.h
View File

@ -53,16 +53,15 @@ public:
int64_t fs_in,
uint32_t sampled_ms,
uint32_t select_queue,
lv_16sc_t *all_fft_codes,
uint32_t *all_fft_codes,
uint32_t excludelimit);
~Fpga_Acquisition();
bool init();
bool set_local_code(uint32_t PRN);
bool free();
void set_doppler_sweep(uint32_t num_sweeps);
void set_doppler_sweep(uint32_t num_sweeps, uint32_t doppler_step, int32_t doppler_min);
void run_acquisition(void);
void set_phase_step(uint32_t doppler_index);
void read_acquisition_results(uint32_t *max_index, float *firstpeak, float *secondpeak, uint64_t *initial_sample, float *power_sum, uint32_t *doppler_index, uint32_t *total_blk_exp);
void block_samples();
@ -110,7 +109,7 @@ private:
// data related to the hardware module and the driver
int32_t d_fd; // driver descriptor
volatile uint32_t *d_map_base; // driver memory map
lv_16sc_t *d_all_fft_codes; // memory that contains all the code ffts
uint32_t *d_all_fft_codes; // memory that contains all the code ffts
uint32_t d_vector_length; // number of samples incluing padding and number of ms
uint32_t d_excludelimit;
uint32_t d_nsamples_total; // number of samples including padding
@ -122,7 +121,6 @@ private:
uint32_t d_PRN; // PRN
// FPGA private functions
void fpga_acquisition_test_register(void);
void fpga_configure_acquisition_local_code(lv_16sc_t fft_local_code[]);
void read_result_valid(uint32_t *result_valid);
};

1
src/algorithms/channel/adapters/channel.cc
View File

@ -218,7 +218,6 @@ void Channel::set_signal(const Gnss_Signal& gnss_signal)
acq_->set_local_code();
if (flag_enable_fpga)
{
//set again the gnss_synchro pointer to trigger the preloading of the current PRN code to the FPGA fabric
trk_->set_gnss_synchro(&gnss_synchro_);
}
nav_->set_satellite(gnss_signal_.get_satellite());

6
src/algorithms/signal_source/adapters/ad9361_fpga_signal_source.cc
View File

@ -53,10 +53,10 @@ Ad9361FpgaSignalSource::Ad9361FpgaSignalSource(ConfigurationInterface* configura
std::string default_item_type = "gr_complex";
std::string default_dump_file = "./data/signal_source.dat";
freq_ = configuration->property(role + ".freq", GPS_L1_FREQ_HZ);
sample_rate_ = configuration->property(role + ".sampling_frequency", 2600000);
bandwidth_ = configuration->property(role + ".bandwidth", 2000000);
sample_rate_ = configuration->property(role + ".sampling_frequency", 12500000);
bandwidth_ = configuration->property(role + ".bandwidth", 12500000);
rx1_en_ = configuration->property(role + ".rx1_enable", true);
rx2_en_ = configuration->property(role + ".rx2_enable", false);
rx2_en_ = configuration->property(role + ".rx2_enable", true);
buffer_size_ = configuration->property(role + ".buffer_size", 0xA0000);
quadrature_ = configuration->property(role + ".quadrature", true);
rf_dc_ = configuration->property(role + ".rf_dc", true);

118
src/algorithms/tracking/adapters/galileo_e1_dll_pll_veml_tracking_fpga.cc
View File

@ -48,6 +48,11 @@
#include <cstring> // for memcpy
#include <iostream> // for operator<<,
// the following flags are FPGA-specific and they are using arrange the values of the local code in the way the FPGA
// expects. This arrangement is done in the initialisation to avoid consuming unnecessary clock cycles during tracking.
#define LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY 0x0C000000 // flag that enables WE (Write Enable) of the local code FPGA
#define LOCAL_CODE_FPGA_CORRELATOR_SELECT_COUNT 0x20000000 // flag that selects the writing of the pilot code in the FPGA (as opposed to the data code)
GalileoE1DllPllVemlTrackingFpga::GalileoE1DllPllVemlTrackingFpga(
ConfigurationInterface* configuration, const std::string& role,
@ -56,8 +61,6 @@ GalileoE1DllPllVemlTrackingFpga::GalileoE1DllPllVemlTrackingFpga(
Dll_Pll_Conf_Fpga trk_param_fpga = Dll_Pll_Conf_Fpga();
DLOG(INFO) << "role " << role;
//################# CONFIGURATION PARAMETERS ########################
std::string default_item_type = "gr_complex";
std::string item_type = configuration->property(role + ".item_type", default_item_type);
int32_t fs_in_deprecated = configuration->property("GNSS-SDR.internal_fs_hz", 2048000);
int32_t fs_in = configuration->property("GNSS-SDR.internal_fs_sps", fs_in_deprecated);
trk_param_fpga.fs_in = fs_in;
@ -68,16 +71,76 @@ GalileoE1DllPllVemlTrackingFpga::GalileoE1DllPllVemlTrackingFpga(
trk_param_fpga.dump_filename = dump_filename;
bool dump_mat = configuration->property(role + ".dump_mat", true);
trk_param_fpga.dump_mat = dump_mat;
trk_param_fpga.high_dyn = configuration->property(role + ".high_dyn", false);
if (configuration->property(role + ".smoother_length", 10) < 1)
{
trk_param_fpga.smoother_length = 1;
std::cout << TEXT_RED << "WARNING: Gal. E1. smoother_length must be bigger than 0. It has been set to 1" << TEXT_RESET << std::endl;
}
else
{
trk_param_fpga.smoother_length = configuration->property(role + ".smoother_length", 10);
}
float pll_bw_hz = configuration->property(role + ".pll_bw_hz", 5.0);
if (FLAGS_pll_bw_hz != 0.0) pll_bw_hz = static_cast<float>(FLAGS_pll_bw_hz);
if (FLAGS_pll_bw_hz != 0.0)
{
pll_bw_hz = static_cast<float>(FLAGS_pll_bw_hz);
}
trk_param_fpga.pll_bw_hz = pll_bw_hz;
float dll_bw_hz = configuration->property(role + ".dll_bw_hz", 0.5);
if (FLAGS_dll_bw_hz != 0.0) dll_bw_hz = static_cast<float>(FLAGS_dll_bw_hz);
if (FLAGS_dll_bw_hz != 0.0)
{
dll_bw_hz = static_cast<float>(FLAGS_dll_bw_hz);
}
trk_param_fpga.dll_bw_hz = dll_bw_hz;
float pll_bw_narrow_hz = configuration->property(role + ".pll_bw_narrow_hz", 2.0);
trk_param_fpga.pll_bw_narrow_hz = pll_bw_narrow_hz;
float dll_bw_narrow_hz = configuration->property(role + ".dll_bw_narrow_hz", 0.25);
trk_param_fpga.dll_bw_narrow_hz = dll_bw_narrow_hz;
int dll_filter_order = configuration->property(role + ".dll_filter_order", 2);
if (dll_filter_order < 1)
{
LOG(WARNING) << "dll_filter_order parameter must be 1, 2 or 3. Set to 1.";
dll_filter_order = 1;
}
if (dll_filter_order > 3)
{
LOG(WARNING) << "dll_filter_order parameter must be 1, 2 or 3. Set to 3.";
dll_filter_order = 3;
}
trk_param_fpga.dll_filter_order = dll_filter_order;
int pll_filter_order = configuration->property(role + ".pll_filter_order", 3);
if (pll_filter_order < 2)
{
LOG(WARNING) << "pll_filter_order parameter must be 2 or 3. Set to 2.";
pll_filter_order = 2;
}
if (pll_filter_order > 3)
{
LOG(WARNING) << "pll_filter_order parameter must be 2 or 3. Set to 3.";
pll_filter_order = 3;
}
trk_param_fpga.pll_filter_order = pll_filter_order;
if (pll_filter_order == 2)
{
trk_param_fpga.fll_filter_order = 1;
}
if (pll_filter_order == 3)
{
trk_param_fpga.fll_filter_order = 2;
}
bool enable_fll_pull_in = configuration->property(role + ".enable_fll_pull_in", false);
trk_param_fpga.enable_fll_pull_in = enable_fll_pull_in;
float fll_bw_hz = configuration->property(role + ".fll_bw_hz", 35.0);
trk_param_fpga.fll_bw_hz = fll_bw_hz;
float pull_in_time_s = configuration->property(role + ".pull_in_time_s", 2.0);
trk_param_fpga.pull_in_time_s = pull_in_time_s;
int32_t extend_correlation_symbols = configuration->property(role + ".extend_correlation_symbols", 1);
float early_late_space_chips = configuration->property(role + ".early_late_space_chips", 0.15);
trk_param_fpga.early_late_space_chips = early_late_space_chips;
@ -111,16 +174,29 @@ GalileoE1DllPllVemlTrackingFpga::GalileoE1DllPllVemlTrackingFpga(
char sig_[3] = "1B";
std::memcpy(trk_param_fpga.signal, sig_, 3);
int32_t cn0_samples = configuration->property(role + ".cn0_samples", 20);
if (FLAGS_cn0_samples != 20) cn0_samples = FLAGS_cn0_samples;
if (FLAGS_cn0_samples != 20)
{
cn0_samples = FLAGS_cn0_samples;
}
trk_param_fpga.cn0_samples = cn0_samples;
int32_t cn0_min = configuration->property(role + ".cn0_min", 25);
if (FLAGS_cn0_min != 25) cn0_min = FLAGS_cn0_min;
if (FLAGS_cn0_min != 25)
{
cn0_min = FLAGS_cn0_min;
}
trk_param_fpga.cn0_min = cn0_min;
int32_t max_lock_fail = configuration->property(role + ".max_lock_fail", 50);
if (FLAGS_max_lock_fail != 50) max_lock_fail = FLAGS_max_lock_fail;
if (FLAGS_max_lock_fail != 50)
{
max_lock_fail = FLAGS_max_lock_fail;
}
trk_param_fpga.max_lock_fail = max_lock_fail;
double carrier_lock_th = configuration->property(role + ".carrier_lock_th", 0.85);
if (FLAGS_carrier_lock_th != 0.85) carrier_lock_th = FLAGS_carrier_lock_th;
if (FLAGS_carrier_lock_th != 0.85)
{
carrier_lock_th = FLAGS_carrier_lock_th;
}
trk_param_fpga.carrier_lock_th = carrier_lock_th;
// FPGA configuration parameters
@ -158,19 +234,39 @@ GalileoE1DllPllVemlTrackingFpga::GalileoE1DllPllVemlTrackingFpga(
galileo_e1_code_gen_sinboc11_float(ca_codes_f, pilot_signal, PRN);
galileo_e1_code_gen_sinboc11_float(data_codes_f, data_signal, PRN);
// The code is generated as a series of 1s and -1s. In order to store the values using only one bit, a -1 is stored as a 0 in the FPGA
for (uint32_t s = 0; s < 2 * GALILEO_E1_B_CODE_LENGTH_CHIPS; s++)
{
d_ca_codes[static_cast<int32_t>(GALILEO_E1_B_CODE_LENGTH_CHIPS) * 2 * (PRN - 1) + s] = static_cast<int32_t>(ca_codes_f[s]);
d_data_codes[static_cast<int32_t>(GALILEO_E1_B_CODE_LENGTH_CHIPS) * 2 * (PRN - 1) + s] = static_cast<int32_t>(data_codes_f[s]);
int32_t tmp_value = static_cast<int32_t>(ca_codes_f[s]);
if (tmp_value < 0)
{
tmp_value = 0;
}
tmp_value = tmp_value | LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY;
d_ca_codes[static_cast<int32_t>(GALILEO_E1_B_CODE_LENGTH_CHIPS) * 2 * (PRN - 1) + s] = tmp_value;
tmp_value = static_cast<int32_t>(data_codes_f[s]);
if (tmp_value < 0)
{
tmp_value = 0;
}
tmp_value = tmp_value | LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY | LOCAL_CODE_FPGA_CORRELATOR_SELECT_COUNT;
d_data_codes[static_cast<int32_t>(GALILEO_E1_B_CODE_LENGTH_CHIPS) * 2 * (PRN - 1) + s] = tmp_value;
}
}
else
{
galileo_e1_code_gen_sinboc11_float(ca_codes_f, data_signal, PRN);
// The code is generated as a series of 1s and -1s. In order to store the values using only one bit, a -1 is stored as a 0 in the FPGA
for (uint32_t s = 0; s < 2 * GALILEO_E1_B_CODE_LENGTH_CHIPS; s++)
{
d_ca_codes[static_cast<int32_t>(GALILEO_E1_B_CODE_LENGTH_CHIPS) * 2 * (PRN - 1) + s] = static_cast<int32_t>(ca_codes_f[s]);
int32_t tmp_value = static_cast<int32_t>(ca_codes_f[s]);
if (tmp_value < 0)
{
tmp_value = 0;
}
tmp_value = tmp_value | LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY;
d_ca_codes[static_cast<int32_t>(GALILEO_E1_B_CODE_LENGTH_CHIPS) * 2 * (PRN - 1) + s] = tmp_value;
}
}
}

119
src/algorithms/tracking/adapters/galileo_e5a_dll_pll_tracking_fpga.cc
View File

@ -45,6 +45,11 @@
#include <cstring> // for memcpy
#include <iostream>
// the following flags are FPGA-specific and they are using arrange the values of the local code in the way the FPGA
// expects. This arrangement is done in the initialisation to avoid consuming unnecessary clock cycles during tracking.
#define LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY 0x0C000000 // flag that enables WE (Write Enable) of the local code FPGA
#define LOCAL_CODE_FPGA_CORRELATOR_SELECT_COUNT 0x20000000 // flag that selects the writing of the pilot code in the FPGA (as opposed to the data code)
GalileoE5aDllPllTrackingFpga::GalileoE5aDllPllTrackingFpga(
ConfigurationInterface *configuration, const std::string &role,
@ -53,8 +58,6 @@ GalileoE5aDllPllTrackingFpga::GalileoE5aDllPllTrackingFpga(
Dll_Pll_Conf_Fpga trk_param_fpga = Dll_Pll_Conf_Fpga();
DLOG(INFO) << "role " << role;
//################# CONFIGURATION PARAMETERS ########################
std::string default_item_type = "gr_complex";
std::string item_type = configuration->property(role + ".item_type", default_item_type);
int32_t fs_in_deprecated = configuration->property("GNSS-SDR.internal_fs_hz", 12000000);
int32_t fs_in = configuration->property("GNSS-SDR.internal_fs_sps", fs_in_deprecated);
trk_param_fpga.fs_in = fs_in;
@ -65,12 +68,71 @@ GalileoE5aDllPllTrackingFpga::GalileoE5aDllPllTrackingFpga(
trk_param_fpga.dump_filename = dump_filename;
bool dump_mat = configuration->property(role + ".dump_mat", true);
trk_param_fpga.dump_mat = dump_mat;
trk_param_fpga.high_dyn = configuration->property(role + ".high_dyn", false);
if (configuration->property(role + ".smoother_length", 10) < 1)
{
trk_param_fpga.smoother_length = 1;
std::cout << TEXT_RED << "WARNING: Gal. E5a. smoother_length must be bigger than 0. It has been set to 1" << TEXT_RESET << std::endl;
}
else
{
trk_param_fpga.smoother_length = configuration->property(role + ".smoother_length", 10);
}
float pll_bw_hz = configuration->property(role + ".pll_bw_hz", 20.0);
if (FLAGS_pll_bw_hz != 0.0) pll_bw_hz = static_cast<float>(FLAGS_pll_bw_hz);
if (FLAGS_pll_bw_hz != 0.0)
{
pll_bw_hz = static_cast<float>(FLAGS_pll_bw_hz);
}
trk_param_fpga.pll_bw_hz = pll_bw_hz;
float dll_bw_hz = configuration->property(role + ".dll_bw_hz", 20.0);
if (FLAGS_dll_bw_hz != 0.0) dll_bw_hz = static_cast<float>(FLAGS_dll_bw_hz);
if (FLAGS_dll_bw_hz != 0.0)
{
dll_bw_hz = static_cast<float>(FLAGS_dll_bw_hz);
}
trk_param_fpga.dll_bw_hz = dll_bw_hz;
int dll_filter_order = configuration->property(role + ".dll_filter_order", 2);
if (dll_filter_order < 1)
{
LOG(WARNING) << "dll_filter_order parameter must be 1, 2 or 3. Set to 1.";
dll_filter_order = 1;
}
if (dll_filter_order > 3)
{
LOG(WARNING) << "dll_filter_order parameter must be 1, 2 or 3. Set to 3.";
dll_filter_order = 3;
}
trk_param_fpga.dll_filter_order = dll_filter_order;
int pll_filter_order = configuration->property(role + ".pll_filter_order", 3);
if (pll_filter_order < 2)
{
LOG(WARNING) << "pll_filter_order parameter must be 2 or 3. Set to 2.";
pll_filter_order = 2;
}
if (pll_filter_order > 3)
{
LOG(WARNING) << "pll_filter_order parameter must be 2 or 3. Set to 3.";
pll_filter_order = 3;
}
trk_param_fpga.pll_filter_order = pll_filter_order;
if (pll_filter_order == 2)
{
trk_param_fpga.fll_filter_order = 1;
}
if (pll_filter_order == 3)
{
trk_param_fpga.fll_filter_order = 2;
}
bool enable_fll_pull_in = configuration->property(role + ".enable_fll_pull_in", false);
trk_param_fpga.enable_fll_pull_in = enable_fll_pull_in;
float fll_bw_hz = configuration->property(role + ".fll_bw_hz", 35.0);
trk_param_fpga.fll_bw_hz = fll_bw_hz;
float pull_in_time_s = configuration->property(role + ".pull_in_time_s", 2.0);
trk_param_fpga.pull_in_time_s = pull_in_time_s;
float pll_bw_narrow_hz = configuration->property(role + ".pll_bw_narrow_hz", 5.0);
trk_param_fpga.pll_bw_narrow_hz = pll_bw_narrow_hz;
float dll_bw_narrow_hz = configuration->property(role + ".dll_bw_narrow_hz", 2.0);
@ -106,17 +168,30 @@ GalileoE5aDllPllTrackingFpga::GalileoE5aDllPllTrackingFpga(
char sig_[3] = "5X";
std::memcpy(trk_param_fpga.signal, sig_, 3);
int32_t cn0_samples = configuration->property(role + ".cn0_samples", 20);
if (FLAGS_cn0_samples != 20) cn0_samples = FLAGS_cn0_samples;
if (FLAGS_cn0_samples != 20)
{
cn0_samples = FLAGS_cn0_samples;
}
trk_param_fpga.cn0_samples = cn0_samples;
int32_t cn0_min = configuration->property(role + ".cn0_min", 25);
if (FLAGS_cn0_min != 25) cn0_min = FLAGS_cn0_min;
if (FLAGS_cn0_min != 25)
{
cn0_min = FLAGS_cn0_min;
}
trk_param_fpga.cn0_min = cn0_min;
int32_t max_lock_fail = configuration->property(role + ".max_lock_fail", 50);
if (FLAGS_max_lock_fail != 50) max_lock_fail = FLAGS_max_lock_fail;
if (FLAGS_max_lock_fail != 50)
{
max_lock_fail = FLAGS_max_lock_fail;
}
trk_param_fpga.max_lock_fail = max_lock_fail;
double carrier_lock_th = configuration->property(role + ".carrier_lock_th", 0.85);
if (FLAGS_carrier_lock_th != 0.85) carrier_lock_th = FLAGS_carrier_lock_th;
if (FLAGS_carrier_lock_th != 0.85)
{
carrier_lock_th = FLAGS_carrier_lock_th;
}
trk_param_fpga.carrier_lock_th = carrier_lock_th;
d_data_codes = nullptr;
// FPGA configuration parameters
@ -143,19 +218,41 @@ GalileoE5aDllPllTrackingFpga::GalileoE5aDllPllTrackingFpga(
for (uint32_t PRN = 1; PRN <= GALILEO_E5A_NUMBER_OF_CODES; PRN++)
{
galileo_e5_a_code_gen_complex_primary(aux_code, PRN, const_cast<char *>(sig_));
if (trk_param_fpga.track_pilot)
{
// The code is generated as a series of 1s and -1s. In order to store the values using only one bit, a -1 is stored as a 0 in the FPGA
for (uint32_t s = 0; s < code_length_chips; s++)
{
d_ca_codes[static_cast<int32_t>(code_length_chips) * (PRN - 1) + s] = static_cast<int32_t>(aux_code[s].imag());
d_data_codes[static_cast<int32_t>(code_length_chips) * (PRN - 1) + s] = static_cast<int32_t>(aux_code[s].real());
int32_t tmp_value = static_cast<int32_t>(aux_code[s].imag());
if (tmp_value < 0)
{
tmp_value = 0;
}
tmp_value = tmp_value | LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY;
d_ca_codes[static_cast<int32_t>(code_length_chips) * (PRN - 1) + s] = tmp_value;
tmp_value = static_cast<int32_t>(aux_code[s].real());
if (tmp_value < 0)
{
tmp_value = 0;
}
tmp_value = tmp_value | LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY | LOCAL_CODE_FPGA_CORRELATOR_SELECT_COUNT;
d_data_codes[static_cast<int32_t>(code_length_chips) * (PRN - 1) + s] = tmp_value;
}
}
else
{
// The code is generated as a series of 1s and -1s. In order to store the values using only one bit, a -1 is stored as a 0 in the FPGA
for (uint32_t s = 0; s < code_length_chips; s++)
{
d_ca_codes[static_cast<int32_t>(code_length_chips) * (PRN - 1) + s] = static_cast<int32_t>(aux_code[s].real());
int32_t tmp_value = static_cast<int32_t>(aux_code[s].real());
if (tmp_value < 0)
{
tmp_value = 0;
}
tmp_value = tmp_value | LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY;
d_ca_codes[static_cast<int32_t>(code_length_chips) * (PRN - 1) + s] = tmp_value;
}
}
}

1
src/algorithms/tracking/adapters/galileo_e5a_dll_pll_tracking_fpga.h
View File

@ -99,7 +99,6 @@ private:
std::string role_;
uint32_t in_streams_;
uint32_t out_streams_;
int32_t* d_ca_codes;
int32_t* d_data_codes;
bool d_track_pilot;

105
src/algorithms/tracking/adapters/gps_l1_ca_dll_pll_tracking_fpga.cc
View File

@ -48,8 +48,11 @@
#include <cstring> // for memcpy
#include <iostream>
#define NUM_PRNs 32
#define NUM_PRNs 32 // total number of PRNs
// the following flag is FPGA-specific and they are using arrange the values of the local code in the way the FPGA
// expects. This arrangement is done in the initialisation to avoid consuming unnecessary clock cycles during tracking.
#define LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY 0x0C000000 // flag that enables WE (Write Enable) of the local code FPGA
GpsL1CaDllPllTrackingFpga::GpsL1CaDllPllTrackingFpga(
ConfigurationInterface* configuration, const std::string& role,
@ -62,6 +65,17 @@ GpsL1CaDllPllTrackingFpga::GpsL1CaDllPllTrackingFpga(
int32_t fs_in_deprecated = configuration->property("GNSS-SDR.internal_fs_hz", 2048000);
int32_t fs_in = configuration->property("GNSS-SDR.internal_fs_sps", fs_in_deprecated);
trk_param_fpga.fs_in = fs_in;
trk_param_fpga.high_dyn = configuration->property(role + ".high_dyn", false);
if (configuration->property(role + ".smoother_length", 10) < 1)
{
trk_param_fpga.smoother_length = 1;
std::cout << TEXT_RED << "WARNING: GPS L1 C/A. smoother_length must be bigger than 0. It has been set to 1" << TEXT_RESET << std::endl;
}
else
{
trk_param_fpga.smoother_length = configuration->property(role + ".smoother_length", 10);
}
bool dump = configuration->property(role + ".dump", false);
trk_param_fpga.dump = dump;
std::string default_dump_filename = "./track_ch";
@ -70,15 +84,64 @@ GpsL1CaDllPllTrackingFpga::GpsL1CaDllPllTrackingFpga(
bool dump_mat = configuration->property(role + ".dump_mat", true);
trk_param_fpga.dump_mat = dump_mat;
float pll_bw_hz = configuration->property(role + ".pll_bw_hz", 50.0);
if (FLAGS_pll_bw_hz != 0.0) pll_bw_hz = static_cast<float>(FLAGS_pll_bw_hz);
if (FLAGS_pll_bw_hz != 0.0)
{
pll_bw_hz = static_cast<float>(FLAGS_pll_bw_hz);
}
trk_param_fpga.pll_bw_hz = pll_bw_hz;
float pll_bw_narrow_hz = configuration->property(role + ".pll_bw_narrow_hz", 20.0);
trk_param_fpga.pll_bw_narrow_hz = pll_bw_narrow_hz;
float dll_bw_narrow_hz = configuration->property(role + ".dll_bw_narrow_hz", 2.0);
trk_param_fpga.dll_bw_narrow_hz = dll_bw_narrow_hz;
float dll_bw_hz = configuration->property(role + ".dll_bw_hz", 2.0);
if (FLAGS_dll_bw_hz != 0.0) dll_bw_hz = static_cast<float>(FLAGS_dll_bw_hz);
if (FLAGS_dll_bw_hz != 0.0)
{
dll_bw_hz = static_cast<float>(FLAGS_dll_bw_hz);
}
trk_param_fpga.dll_bw_hz = dll_bw_hz;
int dll_filter_order = configuration->property(role + ".dll_filter_order", 2);
if (dll_filter_order < 1)
{
LOG(WARNING) << "dll_filter_order parameter must be 1, 2 or 3. Set to 1.";
dll_filter_order = 1;
}
if (dll_filter_order > 3)
{
LOG(WARNING) << "dll_filter_order parameter must be 1, 2 or 3. Set to 3.";
dll_filter_order = 3;
}
trk_param_fpga.dll_filter_order = dll_filter_order;
int pll_filter_order = configuration->property(role + ".pll_filter_order", 3);
if (pll_filter_order < 2)
{
LOG(WARNING) << "pll_filter_order parameter must be 2 or 3. Set to 2.";
pll_filter_order = 2;
}
if (pll_filter_order > 3)
{
LOG(WARNING) << "pll_filter_order parameter must be 2 or 3. Set to 3.";
pll_filter_order = 3;
}
trk_param_fpga.pll_filter_order = pll_filter_order;
if (pll_filter_order == 2)
{
trk_param_fpga.fll_filter_order = 1;
}
if (pll_filter_order == 3)
{
trk_param_fpga.fll_filter_order = 2;
}
bool enable_fll_pull_in = configuration->property(role + ".enable_fll_pull_in", false);
trk_param_fpga.enable_fll_pull_in = enable_fll_pull_in;
float fll_bw_hz = configuration->property(role + ".fll_bw_hz", 35.0);
trk_param_fpga.fll_bw_hz = fll_bw_hz;
float pull_in_time_s = configuration->property(role + ".pull_in_time_s", 2.0);
trk_param_fpga.pull_in_time_s = pull_in_time_s;
float early_late_space_chips = configuration->property(role + ".early_late_space_chips", 0.5);
trk_param_fpga.early_late_space_chips = early_late_space_chips;
float early_late_space_narrow_chips = configuration->property(role + ".early_late_space_narrow_chips", 0.5);
@ -113,16 +176,28 @@ GpsL1CaDllPllTrackingFpga::GpsL1CaDllPllTrackingFpga(
char sig_[3] = "1C";
std::memcpy(trk_param_fpga.signal, sig_, 3);
int32_t cn0_samples = configuration->property(role + ".cn0_samples", 20);
if (FLAGS_cn0_samples != 20) cn0_samples = FLAGS_cn0_samples;
if (FLAGS_cn0_samples != 20)
{
cn0_samples = FLAGS_cn0_samples;
}
trk_param_fpga.cn0_samples = cn0_samples;
int32_t cn0_min = configuration->property(role + ".cn0_min", 25);
if (FLAGS_cn0_min != 25) cn0_min = FLAGS_cn0_min;
int32_t cn0_min = configuration->property(role + ".cn0_min", 30);
if (FLAGS_cn0_min != 25)
{
cn0_min = FLAGS_cn0_min;
}
trk_param_fpga.cn0_min = cn0_min;
int32_t max_lock_fail = configuration->property(role + ".max_lock_fail", 50);
if (FLAGS_max_lock_fail != 50) max_lock_fail = FLAGS_max_lock_fail;
if (FLAGS_max_lock_fail != 50)
{
max_lock_fail = FLAGS_max_lock_fail;
}
trk_param_fpga.max_lock_fail = max_lock_fail;
double carrier_lock_th = configuration->property(role + ".carrier_lock_th", 0.85);
if (FLAGS_carrier_lock_th != 0.85) carrier_lock_th = FLAGS_carrier_lock_th;
double carrier_lock_th = configuration->property(role + ".carrier_lock_th", 0.80);
if (FLAGS_carrier_lock_th != 0.85)
{
carrier_lock_th = FLAGS_carrier_lock_th;
}
trk_param_fpga.carrier_lock_th = carrier_lock_th;
// FPGA configuration parameters
@ -138,6 +213,18 @@ GpsL1CaDllPllTrackingFpga::GpsL1CaDllPllTrackingFpga(
for (uint32_t PRN = 1; PRN <= NUM_PRNs; PRN++)
{
gps_l1_ca_code_gen_int(&d_ca_codes[(int32_t(GPS_L1_CA_CODE_LENGTH_CHIPS)) * (PRN - 1)], PRN, 0);
// The code is generated as a series of 1s and -1s. In order to store the values using only one bit, a -1 is stored as a 0 in the FPGA
for (uint32_t k = 0; k < GPS_L1_CA_CODE_LENGTH_CHIPS; k++)
{
int32_t tmp_value = d_ca_codes[(int32_t(GPS_L1_CA_CODE_LENGTH_CHIPS)) * (PRN - 1) + k];
if (tmp_value < 0)
{
tmp_value = 0;
}
tmp_value = tmp_value | LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY;
d_ca_codes[(int32_t(GPS_L1_CA_CODE_LENGTH_CHIPS)) * (PRN - 1) + k] = tmp_value;
}
}
trk_param_fpga.ca_codes = d_ca_codes;
trk_param_fpga.code_length_chips = GPS_L1_CA_CODE_LENGTH_CHIPS;

118
src/algorithms/tracking/adapters/gps_l5_dll_pll_tracking_fpga.cc
View File

@ -50,7 +50,12 @@
#include <cstring> // for memcpy
#include <iostream>
#define NUM_PRNs 32
#define NUM_PRNs 32 // number of PRNS
// the following flags are FPGA-specific and they are using arrange the values of the local code in the way the FPGA
// expects. This arrangement is done in the initialisation to avoid consuming unnecessary clock cycles during tracking.
#define LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY 0x0C000000 // flag that enables WE (Write Enable) of the local code FPGA
#define LOCAL_CODE_FPGA_CORRELATOR_SELECT_COUNT 0x20000000 // flag that selects the writing of the pilot code in the FPGA (as opposed to the data code)
GpsL5DllPllTrackingFpga::GpsL5DllPllTrackingFpga(
@ -70,11 +75,27 @@ GpsL5DllPllTrackingFpga::GpsL5DllPllTrackingFpga(
trk_param_fpga.dump_filename = dump_filename;
bool dump_mat = configuration->property(role + ".dump_mat", true);
trk_param_fpga.dump_mat = dump_mat;
trk_param_fpga.high_dyn = configuration->property(role + ".high_dyn", false);
if (configuration->property(role + ".smoother_length", 10) < 1)
{
trk_param_fpga.smoother_length = 1;
std::cout << TEXT_RED << "WARNING: GPS L5. smoother_length must be bigger than 0. It has been set to 1" << TEXT_RESET << std::endl;
}
else
{
trk_param_fpga.smoother_length = configuration->property(role + ".smoother_length", 10);
}
float pll_bw_hz = configuration->property(role + ".pll_bw_hz", 50.0);
if (FLAGS_pll_bw_hz != 0.0) pll_bw_hz = static_cast<float>(FLAGS_pll_bw_hz);
if (FLAGS_pll_bw_hz != 0.0)
{
pll_bw_hz = static_cast<float>(FLAGS_pll_bw_hz);
}
trk_param_fpga.pll_bw_hz = pll_bw_hz;
float dll_bw_hz = configuration->property(role + ".dll_bw_hz", 2.0);
if (FLAGS_dll_bw_hz != 0.0) dll_bw_hz = static_cast<float>(FLAGS_dll_bw_hz);
if (FLAGS_dll_bw_hz != 0.0)
{
dll_bw_hz = static_cast<float>(FLAGS_dll_bw_hz);
}
trk_param_fpga.dll_bw_hz = dll_bw_hz;
float pll_bw_narrow_hz = configuration->property(role + ".pll_bw_narrow_hz", 2.0);
trk_param_fpga.pll_bw_narrow_hz = pll_bw_narrow_hz;
@ -82,6 +103,49 @@ GpsL5DllPllTrackingFpga::GpsL5DllPllTrackingFpga(
trk_param_fpga.dll_bw_narrow_hz = dll_bw_narrow_hz;
float early_late_space_chips = configuration->property(role + ".early_late_space_chips", 0.5);
trk_param_fpga.early_late_space_chips = early_late_space_chips;
int dll_filter_order = configuration->property(role + ".dll_filter_order", 2);
if (dll_filter_order < 1)
{
LOG(WARNING) << "dll_filter_order parameter must be 1, 2 or 3. Set to 1.";
dll_filter_order = 1;
}
if (dll_filter_order > 3)
{
LOG(WARNING) << "dll_filter_order parameter must be 1, 2 or 3. Set to 3.";
dll_filter_order = 3;
}
trk_param_fpga.dll_filter_order = dll_filter_order;
int pll_filter_order = configuration->property(role + ".pll_filter_order", 3);
if (pll_filter_order < 2)
{
LOG(WARNING) << "pll_filter_order parameter must be 2 or 3. Set to 2.";
pll_filter_order = 2;
}
if (pll_filter_order > 3)
{
LOG(WARNING) << "pll_filter_order parameter must be 2 or 3. Set to 3.";
pll_filter_order = 3;
}
trk_param_fpga.pll_filter_order = pll_filter_order;
if (pll_filter_order == 2)
{
trk_param_fpga.fll_filter_order = 1;
}
if (pll_filter_order == 3)
{
trk_param_fpga.fll_filter_order = 2;
}
bool enable_fll_pull_in = configuration->property(role + ".enable_fll_pull_in", false);
trk_param_fpga.enable_fll_pull_in = enable_fll_pull_in;
float fll_bw_hz = configuration->property(role + ".fll_bw_hz", 35.0);
trk_param_fpga.fll_bw_hz = fll_bw_hz;
float pull_in_time_s = configuration->property(role + ".pull_in_time_s", 2.0);
trk_param_fpga.pull_in_time_s = pull_in_time_s;
int32_t vector_length = std::round(static_cast<double>(fs_in) / (static_cast<double>(GPS_L5I_CODE_RATE_HZ) / static_cast<double>(GPS_L5I_CODE_LENGTH_CHIPS)));
trk_param_fpga.vector_length = vector_length;
int32_t extend_correlation_symbols = configuration->property(role + ".extend_correlation_symbols", 1);
@ -111,16 +175,28 @@ GpsL5DllPllTrackingFpga::GpsL5DllPllTrackingFpga(
char sig_[3] = "L5";
std::memcpy(trk_param_fpga.signal, sig_, 3);
int32_t cn0_samples = configuration->property(role + ".cn0_samples", 20);
if (FLAGS_cn0_samples != 20) cn0_samples = FLAGS_cn0_samples;
if (FLAGS_cn0_samples != 20)
{
cn0_samples = FLAGS_cn0_samples;
}
trk_param_fpga.cn0_samples = cn0_samples;
int32_t cn0_min = configuration->property(role + ".cn0_min", 25);
if (FLAGS_cn0_min != 25) cn0_min = FLAGS_cn0_min;
if (FLAGS_cn0_min != 25)
{
cn0_min = FLAGS_cn0_min;
}
trk_param_fpga.cn0_min = cn0_min;
int32_t max_lock_fail = configuration->property(role + ".max_lock_fail", 50);
if (FLAGS_max_lock_fail != 50) max_lock_fail = FLAGS_max_lock_fail;
if (FLAGS_max_lock_fail != 50)
{
max_lock_fail = FLAGS_max_lock_fail;
}
trk_param_fpga.max_lock_fail = max_lock_fail;
double carrier_lock_th = configuration->property(role + ".carrier_lock_th", 0.75);
if (FLAGS_carrier_lock_th != 0.85) carrier_lock_th = FLAGS_carrier_lock_th;
if (FLAGS_carrier_lock_th != 0.85)
{
carrier_lock_th = FLAGS_carrier_lock_th;
}
trk_param_fpga.carrier_lock_th = carrier_lock_th;
// FPGA configuration parameters
@ -163,18 +239,40 @@ GpsL5DllPllTrackingFpga::GpsL5DllPllTrackingFpga(
gps_l5q_code_gen_float(tracking_code, PRN);
gps_l5i_code_gen_float(data_code, PRN);
// The code is generated as a series of 1s and -1s. In order to store the values using only one bit, a -1 is stored as a 0 in the FPGA
for (uint32_t s = 0; s < code_length_chips; s++)
{
d_ca_codes[static_cast<int32_t>(code_length_chips) * (PRN - 1) + s] = static_cast<int32_t>(tracking_code[s]);
d_data_codes[static_cast<int32_t>(code_length_chips) * (PRN - 1) + s] = static_cast<int32_t>(data_code[s]);
int32_t tmp_value = static_cast<int32_t>(tracking_code[s]);
if (tmp_value < 0)
{
tmp_value = 0;
}
tmp_value = tmp_value | LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY;
d_ca_codes[static_cast<int32_t>(code_length_chips) * (PRN - 1) + s] = tmp_value;
tmp_value = static_cast<int32_t>(data_code[s]);
if (tmp_value < 0)
{
tmp_value = 0;
}
tmp_value = tmp_value | LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY | LOCAL_CODE_FPGA_CORRELATOR_SELECT_COUNT;
d_data_codes[static_cast<int32_t>(code_length_chips) * (PRN - 1) + s] = tmp_value;
}
}
else
{
gps_l5i_code_gen_float(tracking_code, PRN);
// The code is generated as a series of 1s and -1s. In order to store the values using only one bit, a -1 is stored as a 0 in the FPGA
for (uint32_t s = 0; s < code_length_chips; s++)
{
d_ca_codes[static_cast<int32_t>(code_length_chips) * (PRN - 1) + s] = static_cast<int32_t>(tracking_code[s]);
int32_t tmp_value = static_cast<int32_t>(tracking_code[s]);
if (tmp_value < 0)
{
tmp_value = 0;
}
tmp_value = tmp_value | LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY;
d_ca_codes[static_cast<int32_t>(code_length_chips) * (PRN - 1) + s] = tmp_value;
}
}
}

377
src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking_fpga.cc
View File

@ -80,15 +80,17 @@ dll_pll_veml_tracking_fpga::dll_pll_veml_tracking_fpga(const Dll_Pll_Conf_Fpga &
this->message_port_register_in(pmt::mp("preamble_samplestamp"));
// Telemetry message port input
this->message_port_register_in(pmt::mp("telemetry_to_trk"));
//todo: Implement the telemetry_to_trk handler in the same way the software version of tracking
this->set_msg_handler(pmt::mp("telemetry_to_trk"), boost::bind(&dll_pll_veml_tracking_fpga::msg_handler_telemetry_to_trk, this, _1));
// initialize internal vars
d_veml = false;
d_cloop = true;
d_pull_in_transitory = true;
d_code_chip_rate = 0.0;
d_secondary_code_length = 0U;
d_secondary_code_string = nullptr;
d_gps_l1ca_preambles_symbols = nullptr;
d_preambles_symbols = nullptr;
d_preamble_length_symbols = 0;
signal_type = std::string(trk_parameters.signal);
std::map<std::string, std::string> map_signal_pretty_name;
@ -124,7 +126,8 @@ dll_pll_veml_tracking_fpga::dll_pll_veml_tracking_fpga(const Dll_Pll_Conf_Fpga &
uint16_t preambles_bits[GPS_CA_PREAMBLE_LENGTH_BITS] = GPS_PREAMBLE;
// preamble bits to sampled symbols
d_gps_l1ca_preambles_symbols = static_cast<int32_t *>(volk_gnsssdr_malloc(GPS_CA_PREAMBLE_LENGTH_SYMBOLS * sizeof(int32_t), volk_gnsssdr_get_alignment()));
d_preamble_length_symbols = GPS_CA_PREAMBLE_LENGTH_SYMBOLS;
d_preambles_symbols = static_cast<int32_t *>(volk_gnsssdr_malloc(GPS_CA_PREAMBLE_LENGTH_SYMBOLS * sizeof(int32_t), volk_gnsssdr_get_alignment()));
int32_t n = 0;
for (uint16_t preambles_bit : preambles_bits)
{
@ -132,16 +135,16 @@ dll_pll_veml_tracking_fpga::dll_pll_veml_tracking_fpga(const Dll_Pll_Conf_Fpga &
{
if (preambles_bit == 1)
{
d_gps_l1ca_preambles_symbols[n] = 1;
d_preambles_symbols[n] = 1;
}
else
{
d_gps_l1ca_preambles_symbols[n] = -1;
d_preambles_symbols[n] = -1;
}
n++;
}
}
d_symbol_history.resize(GPS_CA_PREAMBLE_LENGTH_SYMBOLS); // Change fixed buffer size
d_symbol_history.set_capacity(GPS_CA_PREAMBLE_LENGTH_SYMBOLS); // Change fixed buffer size
d_symbol_history.clear(); // Clear all the elements in the buffer
}
else if (signal_type == "2S")
@ -268,10 +271,9 @@ dll_pll_veml_tracking_fpga::dll_pll_veml_tracking_fpga(const Dll_Pll_Conf_Fpga &
K_blk_samples = 0.0;
// Initialize tracking ==========================================
d_code_loop_filter.set_DLL_BW(trk_parameters.dll_bw_hz);
d_carrier_loop_filter.set_PLL_BW(trk_parameters.pll_bw_hz);
d_code_loop_filter = Tracking_2nd_DLL_filter(static_cast<float>(d_code_period));
d_carrier_loop_filter = Tracking_2nd_PLL_filter(static_cast<float>(d_code_period));
d_code_loop_filter = Tracking_loop_filter(d_code_period, trk_parameters.dll_bw_hz, trk_parameters.dll_filter_order, false);
printf("trk_parameters.fll_bw_hz = %f trk_parameters.pll_bw_hz = %f trk_parameters.pll_filter_order = %d\n", trk_parameters.fll_bw_hz, trk_parameters.pll_bw_hz, trk_parameters.pll_filter_order);
d_carrier_loop_filter.set_params(trk_parameters.fll_bw_hz, trk_parameters.pll_bw_hz, trk_parameters.pll_filter_order);
if (d_veml)
{
@ -326,6 +328,7 @@ dll_pll_veml_tracking_fpga::dll_pll_veml_tracking_fpga(const Dll_Pll_Conf_Fpga &
}
// --- Initializations ---
d_Prompt_circular_buffer.set_capacity(d_secondary_code_length);
// Initial code frequency basis of NCO
d_code_freq_chips = d_code_chip_rate;
// Residual code phase (in chips)
@ -340,6 +343,8 @@ dll_pll_veml_tracking_fpga::dll_pll_veml_tracking_fpga(const Dll_Pll_Conf_Fpga &
d_current_prn_length_samples = static_cast<int32_t>(trk_parameters.vector_length);
d_next_prn_length_samples = d_current_prn_length_samples;
d_current_correlation_time_s = 0.0;
d_correlation_length_samples = static_cast<int32_t>(trk_parameters.vector_length); // this one is only for initialisation and does not change its value (MM)
// CN0 estimation and lock detector buffers
@ -370,13 +375,13 @@ dll_pll_veml_tracking_fpga::dll_pll_veml_tracking_fpga(const Dll_Pll_Conf_Fpga &
if (trk_parameters.smoother_length > 0)
{
d_carr_ph_history.resize(trk_parameters.smoother_length * 2);
d_code_ph_history.resize(trk_parameters.smoother_length * 2);
d_carr_ph_history.set_capacity(trk_parameters.smoother_length * 2);
d_code_ph_history.set_capacity(trk_parameters.smoother_length * 2);
}
else
{
d_carr_ph_history.resize(1);
d_code_ph_history.resize(1);
d_carr_ph_history.set_capacity(1);
d_code_ph_history.set_capacity(1);
}
d_dump = trk_parameters.dump;
@ -425,9 +430,45 @@ dll_pll_veml_tracking_fpga::dll_pll_veml_tracking_fpga(const Dll_Pll_Conf_Fpga &
d_sample_counter_next = 0ULL;
}
void dll_pll_veml_tracking_fpga::msg_handler_telemetry_to_trk(const pmt::pmt_t &msg)
{
try
{
if (pmt::any_ref(msg).type() == typeid(int))
{
int tlm_event;
tlm_event = boost::any_cast<int>(pmt::any_ref(msg));
switch (tlm_event)
{
case 1: //tlm fault in current channel
{
DLOG(INFO) << "Telemetry fault received in ch " << this->d_channel;
gr::thread::scoped_lock lock(d_setlock);
d_carrier_lock_fail_counter = 10000; //force loss-of-lock condition
break;
}
default:
{
break;
}
}
}
}
catch (boost::bad_any_cast &e)
{
LOG(WARNING) << "msg_handler_telemetry_to_trk Bad any cast!";
}
}
void dll_pll_veml_tracking_fpga::start_tracking()
{
// all the calculations that do not require the data from the acquisition module are moved to the
// set_gnss_synchro command, which is received with a valid PRN before the acquisition module starts the
// acquisition process. This is done to minimize the time between the end of the acquisition process and
// the beginning of the tracking process.
// correct the code phase according to the delay between acq and trk
d_acq_code_phase_samples = d_acquisition_gnss_synchro->Acq_delay_samples;
d_acq_carrier_doppler_hz = d_acquisition_gnss_synchro->Acq_doppler_hz;
@ -435,75 +476,13 @@ void dll_pll_veml_tracking_fpga::start_tracking()
d_carrier_doppler_hz = d_acq_carrier_doppler_hz;
d_carrier_phase_step_rad = PI_2 * d_carrier_doppler_hz / trk_parameters.fs_in;
d_carrier_phase_rate_step_rad = 0.0;
d_carr_ph_history.clear();
d_code_ph_history.clear();
// DLL/PLL filter initialization
d_carrier_loop_filter.initialize(); // initialize the carrier filter
d_code_loop_filter.initialize(); // initialize the code filter
if (systemName == "GPS" and signal_type == "L5")
{
if (trk_parameters.track_pilot)
{
d_Prompt_Data[0] = gr_complex(0.0, 0.0);
}
}
else if (systemName == "Galileo" and signal_type == "1B")
{
if (trk_parameters.track_pilot)
{
d_Prompt_Data[0] = gr_complex(0.0, 0.0);
}
}
else if (systemName == "Galileo" and signal_type == "5X")
{
if (trk_parameters.track_pilot)
{
d_secondary_code_string = const_cast<std::string *>(&GALILEO_E5A_Q_SECONDARY_CODE[d_acquisition_gnss_synchro->PRN - 1]);
d_Prompt_Data[0] = gr_complex(0.0, 0.0);
}
}
std::fill_n(d_correlator_outs, d_n_correlator_taps, gr_complex(0.0, 0.0));
// filter initialization
d_carrier_loop_filter.initialize(static_cast<float>(d_acq_carrier_doppler_hz)); // initialize the carrier filter
d_carrier_lock_fail_counter = 0;
d_rem_code_phase_samples = 0.0;
d_rem_carr_phase_rad = 0.0;
d_rem_code_phase_chips = 0.0;
d_acc_carrier_phase_rad = 0.0;
d_cn0_estimation_counter = 0;
d_carrier_lock_test = 1.0;
d_CN0_SNV_dB_Hz = 0.0;
if (d_veml)
{
d_local_code_shift_chips[0] = -trk_parameters.very_early_late_space_chips * static_cast<float>(d_code_samples_per_chip);
d_local_code_shift_chips[1] = -trk_parameters.early_late_space_chips * static_cast<float>(d_code_samples_per_chip);
d_local_code_shift_chips[3] = trk_parameters.early_late_space_chips * static_cast<float>(d_code_samples_per_chip);
d_local_code_shift_chips[4] = trk_parameters.very_early_late_space_chips * static_cast<float>(d_code_samples_per_chip);
}
else
{
d_local_code_shift_chips[0] = -trk_parameters.early_late_space_chips * static_cast<float>(d_code_samples_per_chip);
d_local_code_shift_chips[2] = trk_parameters.early_late_space_chips * static_cast<float>(d_code_samples_per_chip);
}
d_code_loop_filter.set_DLL_BW(trk_parameters.dll_bw_hz);
d_carrier_loop_filter.set_PLL_BW(trk_parameters.pll_bw_hz);
d_carrier_loop_filter.set_pdi(static_cast<float>(d_code_period));
d_code_loop_filter.set_pdi(static_cast<float>(d_code_period));
// DEBUG OUTPUT
std::cout << "Tracking of " << systemName << " " << signal_pretty_name << " signal started on channel " << d_channel << " for satellite " << Gnss_Satellite(systemName, d_acquisition_gnss_synchro->PRN) << std::endl;
DLOG(INFO) << "Starting tracking of satellite " << Gnss_Satellite(systemName, d_acquisition_gnss_synchro->PRN) << " on channel " << d_channel;
multicorrelator_fpga->set_local_code_and_taps(d_local_code_shift_chips, d_prompt_data_shift, d_acquisition_gnss_synchro->PRN);
// enable tracking pull-in
d_state = 1;
d_cloop = true;
d_Prompt_buffer_deque.clear();
d_last_prompt = gr_complex(0.0, 0.0);
}
@ -511,7 +490,7 @@ dll_pll_veml_tracking_fpga::~dll_pll_veml_tracking_fpga()
{
if (signal_type == "1C")
{
volk_gnsssdr_free(d_gps_l1ca_preambles_symbols);
volk_gnsssdr_free(d_preambles_symbols);
}
if (d_dump_file.is_open())
@ -557,7 +536,8 @@ bool dll_pll_veml_tracking_fpga::acquire_secondary()
int32_t corr_value = 0;
for (uint32_t i = 0; i < d_secondary_code_length; i++)
{
if (d_Prompt_buffer_deque.at(i).real() < 0.0) // symbols clipping
if (d_Prompt_circular_buffer[i].real() < 0.0) // symbols clipping
//if (d_Prompt_buffer_deque.at(i).real() < 0.0) // symbols clipping
{
if (d_secondary_code_string->at(i) == '0')
{
@ -585,17 +565,14 @@ bool dll_pll_veml_tracking_fpga::acquire_secondary()
{
return true;
}
else
{
return false;
}
}
bool dll_pll_veml_tracking_fpga::cn0_and_tracking_lock_status(double coh_integration_time_s)
{
// ####### CN0 ESTIMATION AND LOCK DETECTORS ######
if (d_cn0_estimation_counter < trk_parameters.cn0_samples)
{
// fill buffer with prompt correlator output values
@ -611,13 +588,19 @@ bool dll_pll_veml_tracking_fpga::cn0_and_tracking_lock_status(double coh_integra
// Carrier lock indicator
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, trk_parameters.cn0_samples);
// Loss of lock detection
if (!d_pull_in_transitory)
{
if (d_carrier_lock_test < d_carrier_lock_threshold or d_CN0_SNV_dB_Hz < trk_parameters.cn0_min)
{
d_carrier_lock_fail_counter++;
}
else
{
if (d_carrier_lock_fail_counter > 0) d_carrier_lock_fail_counter--;
if (d_carrier_lock_fail_counter > 0)
{
d_carrier_lock_fail_counter--;
}
}
}
if (d_carrier_lock_fail_counter > trk_parameters.max_lock_fail)
{
@ -641,10 +624,10 @@ bool dll_pll_veml_tracking_fpga::cn0_and_tracking_lock_status(double coh_integra
// - updated remnant code phase in samples (d_rem_code_phase_samples)
// - d_code_freq_chips
// - d_carrier_doppler_hz
//void dll_pll_veml_tracking_fpga::do_correlation_step(const gr_complex *input_samples)
void dll_pll_veml_tracking_fpga::do_correlation_step(void)
{
// // ################# CARRIER WIPEOFF AND CORRELATORS ##############################
// ################# CARRIER WIPEOFF AND CORRELATORS ##############################
// perform carrier wipe-off and compute Early, Prompt and Late correlation
multicorrelator_fpga->Carrier_wipeoff_multicorrelator_resampler(
d_rem_carr_phase_rad,
@ -660,22 +643,48 @@ void dll_pll_veml_tracking_fpga::run_dll_pll()
{
// ################## PLL ##########################################################
// PLL discriminator
//printf("d_cloop = %d\n", d_cloop);
if (d_cloop)
{
// Costas loop discriminator, insensitive to 180 deg phase transitions
d_carr_phase_error_hz = pll_cloop_two_quadrant_atan(d_P_accu) / PI_2;
d_carr_error_hz = pll_cloop_two_quadrant_atan(d_P_accu) / PI_2;
}
else
{
// Secondary code acquired. No symbols transition should be present in the signal
d_carr_phase_error_hz = pll_four_quadrant_atan(d_P_accu) / PI_2;
d_carr_error_hz = pll_four_quadrant_atan(d_P_accu) / PI_2;
}
if ((d_pull_in_transitory == true and trk_parameters.enable_fll_pull_in == true) or trk_parameters.enable_fll_steady_state)
{
// FLL discriminator
d_carr_freq_error_hz = fll_four_quadrant_atan(d_P_accu_old, d_P_accu, 0, d_current_correlation_time_s) / GPS_TWO_PI;
d_P_accu_old = d_P_accu;
// Carrier discriminator filter
d_carr_error_filt_hz = d_carrier_loop_filter.get_carrier_nco(d_carr_error_hz);
// New carrier Doppler frequency estimation
d_carrier_doppler_hz = d_acq_carrier_doppler_hz + d_carr_error_filt_hz;
if ((d_pull_in_transitory == true and trk_parameters.enable_fll_pull_in == true))
{
//pure FLL, disable PLL
d_carr_error_filt_hz = d_carrier_loop_filter.get_carrier_error(d_carr_freq_error_hz, 0, d_current_correlation_time_s);
}
else
{
//FLL-aided PLL
d_carr_error_filt_hz = d_carrier_loop_filter.get_carrier_error(d_carr_freq_error_hz, d_carr_phase_error_hz, d_current_correlation_time_s);
}
}
else
{
// Carrier discriminator filter
d_carr_error_filt_hz = d_carrier_loop_filter.get_carrier_error(0, d_carr_phase_error_hz, d_current_correlation_time_s);
}
// New carrier Doppler frequency estimation
d_carrier_doppler_hz = d_carr_error_filt_hz;
// std::cout << "d_carrier_doppler_hz: " << d_carrier_doppler_hz << std::endl;
// std::cout << "d_CN0_SNV_dB_Hz: " << this->d_CN0_SNV_dB_Hz << std::endl;
// ################## DLL ##########################################################
// DLL discriminator
if (d_veml)
@ -687,7 +696,7 @@ void dll_pll_veml_tracking_fpga::run_dll_pll()
d_code_error_chips = dll_nc_e_minus_l_normalized(d_E_accu, d_L_accu); // [chips/Ti]
}
// Code discriminator filter
d_code_error_filt_chips = d_code_loop_filter.get_code_nco(d_code_error_chips); // [chips/second]
d_code_error_filt_chips = d_code_loop_filter.apply(d_code_error_chips); // [chips/second]
// New code Doppler frequency estimation
d_code_freq_chips = (1.0 + (d_carrier_doppler_hz / d_signal_carrier_freq)) * d_code_chip_rate - d_code_error_filt_chips;
@ -697,13 +706,20 @@ void dll_pll_veml_tracking_fpga::run_dll_pll()
void dll_pll_veml_tracking_fpga::clear_tracking_vars()
{
std::fill_n(d_correlator_outs, d_n_correlator_taps, gr_complex(0.0, 0.0));
if (trk_parameters.track_pilot) d_Prompt_Data[0] = gr_complex(0.0, 0.0);
if (trk_parameters.track_pilot)
{
d_Prompt_Data[0] = gr_complex(0.0, 0.0);
}
d_P_accu_old = gr_complex(0.0, 0.0);
d_carr_phase_error_hz = 0.0;
d_carr_freq_error_hz = 0.0;
d_carr_error_hz = 0.0;
d_carr_error_filt_hz = 0.0;
d_code_error_chips = 0.0;
d_code_error_filt_chips = 0.0;
d_current_symbol = 0;
d_Prompt_buffer_deque.clear();
d_Prompt_circular_buffer.clear();
//d_Prompt_buffer_deque.clear();
d_last_prompt = gr_complex(0.0, 0.0);
d_carrier_phase_rate_step_rad = 0.0;
d_code_phase_rate_step_chips = 0.0;
@ -722,6 +738,7 @@ void dll_pll_veml_tracking_fpga::update_tracking_vars()
// Compute the next buffer length based in the new period of the PRN sequence and the code phase error estimation
T_prn_samples = T_prn_seconds * trk_parameters.fs_in;
K_blk_samples = T_prn_samples + d_rem_code_phase_samples;
//d_next_prn_length_samples = static_cast<int32_t>(std::floor(K_blk_samples)); // round to a discrete number of samples
d_next_prn_length_samples = static_cast<int32_t>(std::floor(K_blk_samples)); // round to a discrete number of samples
//################### PLL COMMANDS #################################################
@ -736,22 +753,26 @@ void dll_pll_veml_tracking_fpga::update_tracking_vars()
double tmp_cp1 = 0.0;
double tmp_cp2 = 0.0;
double tmp_samples = 0.0;
for (uint32_t k = 0; k < trk_parameters.smoother_length; k++)
for (unsigned int k = 0; k < trk_parameters.smoother_length; k++)
{
tmp_cp1 += d_carr_ph_history.at(k).first;
tmp_cp2 += d_carr_ph_history.at(trk_parameters.smoother_length * 2 - k - 1).first;
tmp_samples += d_carr_ph_history.at(trk_parameters.smoother_length * 2 - k - 1).second;
tmp_cp1 += d_carr_ph_history[k].first;
tmp_cp2 += d_carr_ph_history[trk_parameters.smoother_length * 2 - k - 1].first;
tmp_samples += d_carr_ph_history[trk_parameters.smoother_length * 2 - k - 1].second;
}
tmp_cp1 /= static_cast<double>(trk_parameters.smoother_length);
tmp_cp2 /= static_cast<double>(trk_parameters.smoother_length);
d_carrier_phase_rate_step_rad = (tmp_cp2 - tmp_cp1) / tmp_samples;
}
}
//std::cout << d_carrier_phase_rate_step_rad * trk_parameters.fs_in * trk_parameters.fs_in / PI_2 << std::endl;
// remnant carrier phase to prevent overflow in the code NCO
d_rem_carr_phase_rad += static_cast<float>(d_carrier_phase_step_rad * static_cast<double>(d_current_prn_length_samples) + 0.5 * d_carrier_phase_rate_step_rad * static_cast<double>(d_current_prn_length_samples) * static_cast<double>(d_current_prn_length_samples));
d_rem_carr_phase_rad = fmod(d_rem_carr_phase_rad, PI_2);
// carrier phase accumulator
//double a = d_carrier_phase_step_rad * static_cast<double>(d_current_prn_length_samples);
//double b = 0.5 * d_carrier_phase_rate_step_rad * static_cast<double>(d_current_prn_length_samples) * static_cast<double>(d_current_prn_length_samples);
//std::cout << fmod(b, PI_2) / fmod(a, PI_2) << std::endl;
d_acc_carrier_phase_rad -= (d_carrier_phase_step_rad * static_cast<double>(d_current_prn_length_samples) + 0.5 * d_carrier_phase_rate_step_rad * static_cast<double>(d_current_prn_length_samples) * static_cast<double>(d_current_prn_length_samples));
//################### DLL COMMANDS #################################################
@ -765,11 +786,11 @@ void dll_pll_veml_tracking_fpga::update_tracking_vars()
double tmp_cp1 = 0.0;
double tmp_cp2 = 0.0;
double tmp_samples = 0.0;
for (uint32_t k = 0; k < trk_parameters.smoother_length; k++)
for (unsigned int k = 0; k < trk_parameters.smoother_length; k++)
{
tmp_cp1 += d_code_ph_history.at(k).first;
tmp_cp2 += d_code_ph_history.at(trk_parameters.smoother_length * 2 - k - 1).first;
tmp_samples += d_code_ph_history.at(trk_parameters.smoother_length * 2 - k - 1).second;
tmp_cp1 += d_code_ph_history[k].first;
tmp_cp2 += d_code_ph_history[trk_parameters.smoother_length * 2 - k - 1].first;
tmp_samples += d_code_ph_history[trk_parameters.smoother_length * 2 - k - 1].second;
}
tmp_cp1 /= static_cast<double>(trk_parameters.smoother_length);
tmp_cp2 /= static_cast<double>(trk_parameters.smoother_length);
@ -827,9 +848,13 @@ void dll_pll_veml_tracking_fpga::save_correlation_results()
}
// If tracking pilot, disable Costas loop
if (trk_parameters.track_pilot)
{
d_cloop = false;
}
else
{
d_cloop = true;
}
}
@ -927,7 +952,8 @@ void dll_pll_veml_tracking_fpga::log_data(bool integrating)
tmp_float = d_code_phase_rate_step_chips * trk_parameters.fs_in * trk_parameters.fs_in;
d_dump_file.write(reinterpret_cast<char *>(&tmp_float), sizeof(float));
// PLL commands
tmp_float = d_carr_error_hz;
tmp_float = d_carr_phase_error_hz;
//tmp_float = d_carr_error_hz;
d_dump_file.write(reinterpret_cast<char *>(&tmp_float), sizeof(float));
tmp_float = d_carr_error_filt_hz;
d_dump_file.write(reinterpret_cast<char *>(&tmp_float), sizeof(float));
@ -1221,6 +1247,8 @@ void dll_pll_veml_tracking_fpga::set_channel(uint32_t channel)
{
try
{
//trk_parameters.dump_filename.append(boost::lexical_cast<std::string>(d_channel));
//trk_parameters.dump_filename.append(".dat");
d_dump_file.exceptions(std::ifstream::failbit | std::ifstream::badbit);
d_dump_file.open(dump_filename_.c_str(), std::ios::out | std::ios::binary);
LOG(INFO) << "Tracking dump enabled on channel " << d_channel << " Log file: " << dump_filename_.c_str();
@ -1237,6 +1265,86 @@ void dll_pll_veml_tracking_fpga::set_channel(uint32_t channel)
void dll_pll_veml_tracking_fpga::set_gnss_synchro(Gnss_Synchro *p_gnss_synchro)
{
d_acquisition_gnss_synchro = p_gnss_synchro;
if (p_gnss_synchro->PRN > 0)
{
//std::cout << "Acquisition is about to start " << std::endl;
// When using the FPGA the SW only reads the sample counter during active tracking in order to spare CPU clock cycles.
d_sample_counter = 0;
d_sample_counter_next = 0;
d_carrier_phase_rate_step_rad = 0.0;
d_code_ph_history.clear();
// DLL/PLL filter initialization
d_code_loop_filter.initialize(); // initialize the code filter
d_carr_ph_history.clear();
if (systemName == "GPS" and signal_type == "L5")
{
if (trk_parameters.track_pilot)
{
d_Prompt_Data[0] = gr_complex(0.0, 0.0);
}
}
else if (systemName == "Galileo" and signal_type == "1B")
{
if (trk_parameters.track_pilot)
{
d_Prompt_Data[0] = gr_complex(0.0, 0.0);
}
}
else if (systemName == "Galileo" and signal_type == "5X")
{
if (trk_parameters.track_pilot)
{
d_secondary_code_string = const_cast<std::string *>(&GALILEO_E5A_Q_SECONDARY_CODE[d_acquisition_gnss_synchro->PRN - 1]);
d_Prompt_Data[0] = gr_complex(0.0, 0.0);
}
}
std::fill_n(d_correlator_outs, d_n_correlator_taps, gr_complex(0.0, 0.0));
d_carrier_lock_fail_counter = 0;
d_rem_code_phase_samples = 0.0;
d_rem_carr_phase_rad = 0.0;
d_rem_code_phase_chips = 0.0;
d_acc_carrier_phase_rad = 0.0;
d_cn0_estimation_counter = 0;
d_carrier_lock_test = 1.0;
d_CN0_SNV_dB_Hz = 0.0;
if (d_veml)
{
d_local_code_shift_chips[0] = -trk_parameters.very_early_late_space_chips * static_cast<float>(d_code_samples_per_chip);
d_local_code_shift_chips[1] = -trk_parameters.early_late_space_chips * static_cast<float>(d_code_samples_per_chip);
d_local_code_shift_chips[3] = trk_parameters.early_late_space_chips * static_cast<float>(d_code_samples_per_chip);
d_local_code_shift_chips[4] = trk_parameters.very_early_late_space_chips * static_cast<float>(d_code_samples_per_chip);
}
else
{
d_local_code_shift_chips[0] = -trk_parameters.early_late_space_chips * static_cast<float>(d_code_samples_per_chip);
d_local_code_shift_chips[2] = trk_parameters.early_late_space_chips * static_cast<float>(d_code_samples_per_chip);
}
d_current_correlation_time_s = d_code_period;
d_code_loop_filter.set_noise_bandwidth(trk_parameters.dll_bw_hz);
d_code_loop_filter.set_update_interval(d_code_period);
multicorrelator_fpga->set_local_code_and_taps(d_local_code_shift_chips, d_prompt_data_shift, d_acquisition_gnss_synchro->PRN);
d_pull_in_transitory = true;
//d_Prompt_buffer_deque.clear();
d_last_prompt = gr_complex(0.0, 0.0);
d_cloop = true;
d_Prompt_circular_buffer.clear();
}
}
@ -1262,15 +1370,30 @@ int dll_pll_veml_tracking_fpga::general_work(int noutput_items __attribute__((un
d_current_prn_length_samples = d_next_prn_length_samples;
if (d_pull_in_transitory == true)
{
if (d_sample_counter > 0) // do not execute this condition until the sample counter has ben read for the first time after start_tracking
{
if (trk_parameters.pull_in_time_s < (d_sample_counter - d_acq_sample_stamp) / static_cast<int>(trk_parameters.fs_in))
{
d_pull_in_transitory = false;
}
}
}
switch (d_state)
{
case 0: // Standby - Consume samples at full throttle, do nothing
{
return 0;
*out[0] = *d_acquisition_gnss_synchro;
usleep(1000);
return 1;
break;
}
case 1: // Pull-in
{
// Signal alignment (skip samples until the incoming signal is aligned with local replica)
int64_t acq_trk_diff_samples;
double acq_trk_diff_seconds;
double delta_trk_to_acq_prn_start_samples;
@ -1304,7 +1427,6 @@ int dll_pll_veml_tracking_fpga::general_work(int noutput_items __attribute__((un
current_synchro_data.Tracking_sample_counter = absolute_samples_offset;
d_sample_counter_next = d_sample_counter;
// Signal alignment (skip samples until the incoming signal is aligned with local replica)
// Doppler effect Fd = (C / (C + Vr)) * F
double radial_velocity = (d_signal_carrier_freq + d_acq_carrier_doppler_hz) / d_signal_carrier_freq;
@ -1325,7 +1447,12 @@ int dll_pll_veml_tracking_fpga::general_work(int noutput_items __attribute__((un
d_acc_carrier_phase_rad -= d_carrier_phase_step_rad * static_cast<double>(samples_offset);
d_state = 2;
// DEBUG OUTPUT
std::cout << "Tracking of " << systemName << " " << signal_pretty_name << " signal started on channel " << d_channel << " for satellite " << Gnss_Satellite(systemName, d_acquisition_gnss_synchro->PRN) << std::endl;
DLOG(INFO) << "Starting tracking of satellite " << Gnss_Satellite(systemName, d_acquisition_gnss_synchro->PRN) << " on channel " << d_channel;
DLOG(INFO) << "Number of samples between Acquisition and Tracking = " << acq_trk_diff_samples << " ( " << acq_trk_diff_seconds << " s)";
std::cout << "Number of samples between Acquisition and Tracking = " << acq_trk_diff_samples << " ( " << acq_trk_diff_seconds << " s)" << std::endl;
DLOG(INFO) << "PULL-IN Doppler [Hz] = " << d_carrier_doppler_hz
<< ". PULL-IN Code Phase [samples] = " << d_acq_code_phase_samples;
@ -1470,9 +1597,6 @@ int dll_pll_veml_tracking_fpga::general_work(int noutput_items __attribute__((un
if (current_synchro_data.Flag_valid_symbol_output)
{
current_synchro_data.fs = static_cast<int64_t>(trk_parameters.fs_in);
// two choices for the reporting of the sample counter:
// either the sample counter position that should be (d_sample_counter_next)
//or the sample counter corresponding to the number of samples that the FPGA actually consumed.
current_synchro_data.Tracking_sample_counter = d_sample_counter_next;
*out[0] = current_synchro_data;
return 1;
@ -1515,17 +1639,20 @@ void dll_pll_veml_tracking_fpga::run_state_2(Gnss_Synchro &current_synchro_data)
if (d_secondary)
{
// ####### SECONDARY CODE LOCK #####
d_Prompt_buffer_deque.push_back(*d_Prompt);
if (d_Prompt_buffer_deque.size() == d_secondary_code_length)
d_Prompt_circular_buffer.push_back(*d_Prompt);
//d_Prompt_buffer_deque.push_back(*d_Prompt);
//if (d_Prompt_buffer_deque.size() == d_secondary_code_length)
if (d_Prompt_circular_buffer.size() == d_secondary_code_length)
{
next_state = acquire_secondary();
if (next_state)
{
LOG(INFO) << systemName << " " << signal_pretty_name << " secondary code locked in channel " << d_channel
<< " for satellite " << Gnss_Satellite(systemName, d_acquisition_gnss_synchro->PRN) << std::endl;
std::cout << systemName << " " << signal_pretty_name << " secondary code locked in channel " << d_channel
<< " for satellite " << Gnss_Satellite(systemName, d_acquisition_gnss_synchro->PRN) << std::endl;
}
d_Prompt_buffer_deque.pop_front();
//d_Prompt_buffer_deque.pop_front();
}
}
else if (d_symbols_per_bit > 1) //Signal does not have secondary code. Search a bit transition by sign change
@ -1538,20 +1665,24 @@ void dll_pll_veml_tracking_fpga::run_state_2(Gnss_Synchro &current_synchro_data)
int32_t corr_value = 0;
if ((d_symbol_history.size() == GPS_CA_PREAMBLE_LENGTH_SYMBOLS)) // and (d_make_correlation or !d_flag_frame_sync))
{
for (uint32_t i = 0; i < GPS_CA_PREAMBLE_LENGTH_SYMBOLS; i++)
int i = 0;
for (const auto &iter : d_symbol_history)
{
if (d_symbol_history.at(i) < 0) // symbols clipping
if (iter < 0.0) // symbols clipping
{
corr_value -= d_gps_l1ca_preambles_symbols[i];
corr_value -= d_preambles_symbols[i];
}
else
{
corr_value += d_gps_l1ca_preambles_symbols[i];
corr_value += d_preambles_symbols[i];
}
i++;
}
}
if (corr_value == GPS_CA_PREAMBLE_LENGTH_SYMBOLS)
{
LOG(INFO) << systemName << " " << signal_pretty_name << " tracking preamble detected in channel " << d_channel
<< " for satellite " << Gnss_Satellite(systemName, d_acquisition_gnss_synchro->PRN) << std::endl;
next_state = true;
}
else
@ -1598,6 +1729,7 @@ void dll_pll_veml_tracking_fpga::run_state_2(Gnss_Synchro &current_synchro_data)
current_synchro_data.Prompt_Q = static_cast<double>((*d_Prompt).imag());
}
}
current_synchro_data.Code_phase_samples = d_rem_code_phase_samples;
current_synchro_data.Carrier_phase_rads = d_acc_carrier_phase_rad;
current_synchro_data.Carrier_Doppler_hz = d_carrier_doppler_hz;
@ -1612,17 +1744,17 @@ void dll_pll_veml_tracking_fpga::run_state_2(Gnss_Synchro &current_synchro_data)
d_P_accu = gr_complex(0.0, 0.0);
d_L_accu = gr_complex(0.0, 0.0);
d_VL_accu = gr_complex(0.0, 0.0);
d_last_prompt = gr_complex(0.0, 0.0);
d_Prompt_buffer_deque.clear();
d_Prompt_circular_buffer.clear();
d_current_symbol = 0;
d_last_prompt = gr_complex(0.0, 0.0);
//d_Prompt_buffer_deque.clear();
if (d_enable_extended_integration)
{
// UPDATE INTEGRATION TIME
d_extend_correlation_symbols_count = 0;
float new_correlation_time = static_cast<float>(trk_parameters.extend_correlation_symbols) * static_cast<float>(d_code_period);
d_carrier_loop_filter.set_pdi(new_correlation_time);
d_code_loop_filter.set_pdi(new_correlation_time);
d_current_correlation_time_s = static_cast<float>(trk_parameters.extend_correlation_symbols) * static_cast<float>(d_code_period);
d_state = 3; // next state is the extended correlator integrator
LOG(INFO) << "Enabled " << trk_parameters.extend_correlation_symbols * static_cast<int32_t>(d_code_period * 1000.0) << " ms extended correlator in channel "
<< d_channel
@ -1631,8 +1763,9 @@ void dll_pll_veml_tracking_fpga::run_state_2(Gnss_Synchro &current_synchro_data)
<< d_channel
<< " for satellite " << Gnss_Satellite(systemName, d_acquisition_gnss_synchro->PRN) << std::endl;
// Set narrow taps delay values [chips]
d_code_loop_filter.set_DLL_BW(trk_parameters.dll_bw_narrow_hz);
d_carrier_loop_filter.set_PLL_BW(trk_parameters.pll_bw_narrow_hz);
d_code_loop_filter.set_update_interval(d_current_correlation_time_s);
d_code_loop_filter.set_noise_bandwidth(trk_parameters.dll_bw_narrow_hz);
d_carrier_loop_filter.set_params(trk_parameters.fll_bw_hz, trk_parameters.pll_bw_narrow_hz, trk_parameters.pll_filter_order);
if (d_veml)
{
d_local_code_shift_chips[0] = -trk_parameters.very_early_late_space_narrow_chips * static_cast<float>(d_code_samples_per_chip);

45
src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking_fpga.h
View File

@ -33,20 +33,20 @@
#define GNSS_SDR_DLL_PLL_VEML_TRACKING_FPGA_H
#include "dll_pll_conf_fpga.h"
#include "tracking_2nd_DLL_filter.h"
#include "tracking_2nd_PLL_filter.h"
#include "tracking_FLL_PLL_filter.h" // for PLL/FLL filter
#include "tracking_loop_filter.h" // for DLL filter
#include <boost/circular_buffer.hpp>
#include <boost/shared_ptr.hpp>
#include <gnuradio/block.h>
#include <boost/shared_ptr.hpp> // for boost::shared_ptr
#include <gnuradio/block.h> // for block
#include <gnuradio/gr_complex.h> // for gr_complex
#include <gnuradio/types.h> // for gr_vector_const_void_star
#include <gnuradio/types.h> // for gr_vector_int, gr_vector...
#include <pmt/pmt.h> // for pmt_t
#include <cstdint>
#include <cstdint> // for int32_t
#include <deque> // for deque
#include <fstream> // for ofstream
#include <fstream> // for string, ofstream
#include <memory> // for shared_ptr
#include <string>
#include <utility>
#include <utility> // for pair
class Fpga_Multicorrelator_8sc;
class Gnss_Synchro;
@ -77,7 +77,7 @@ public:
private:
friend dll_pll_veml_tracking_fpga_sptr dll_pll_veml_make_tracking_fpga(const Dll_Pll_Conf_Fpga &conf_);
void msg_handler_telemetry_to_trk(const pmt::pmt_t &msg);
dll_pll_veml_tracking_fpga(const Dll_Pll_Conf_Fpga &conf_);
void msg_handler_preamble_index(pmt::pmt_t msg);
@ -115,23 +115,20 @@ private:
std::string *d_secondary_code_string;
std::string signal_pretty_name;
int32_t *d_gps_l1ca_preambles_symbols;
int32_t *d_preambles_symbols;
int32_t d_preamble_length_symbols;
boost::circular_buffer<float> d_symbol_history;
//tracking state machine
// tracking state machine
int32_t d_state;
//Integration period in samples
// Integration period in samples
int32_t d_correlation_length_ms;
int32_t d_n_correlator_taps;
float *d_local_code_shift_chips;
float *d_prompt_data_shift;
std::shared_ptr<Fpga_Multicorrelator_8sc> multicorrelator_fpga;
/* TODO: currently the multicorrelator does not support adding extra correlator
with different local code, thus we need extra multicorrelator instance.
Implement this functionality inside multicorrelator class
as an enhancement to increase the performance
*/
gr_complex *d_correlator_outs;
gr_complex *d_Very_Early;
gr_complex *d_Early;
@ -146,6 +143,7 @@ private:
gr_complex d_VE_accu;
gr_complex d_E_accu;
gr_complex d_P_accu;
gr_complex d_P_accu_old;
gr_complex d_L_accu;
gr_complex d_VL_accu;
gr_complex d_last_prompt;
@ -163,14 +161,18 @@ private:
float d_rem_carr_phase_rad;
// PLL and DLL filter library
Tracking_2nd_DLL_filter d_code_loop_filter;
Tracking_2nd_PLL_filter d_carrier_loop_filter;
Tracking_loop_filter d_code_loop_filter;
Tracking_FLL_PLL_filter d_carrier_loop_filter;
// acquisition
double d_acq_code_phase_samples;
double d_acq_carrier_doppler_hz;
// tracking vars
bool d_pull_in_transitory;
double d_current_correlation_time_s;
double d_carr_phase_error_hz;
double d_carr_freq_error_hz;
double d_carr_error_hz;
double d_carr_error_filt_hz;
double d_code_error_chips;
@ -194,11 +196,12 @@ private:
// CN0 estimation and lock detector
int32_t d_cn0_estimation_counter;
int32_t d_carrier_lock_fail_counter;
std::deque<float> d_carrier_lock_detector_queue;
//std::deque<float> d_carrier_lock_detector_queue;
double d_carrier_lock_test;
double d_CN0_SNV_dB_Hz;
double d_carrier_lock_threshold;
std::deque<gr_complex> d_Prompt_buffer_deque;
boost::circular_buffer<gr_complex> d_Prompt_circular_buffer;
//std::deque<gr_complex> d_Prompt_buffer_deque;
gr_complex *d_Prompt_buffer;
// file dump

9
src/algorithms/tracking/libs/dll_pll_conf_fpga.cc
View File

@ -44,6 +44,15 @@ Dll_Pll_Conf_Fpga::Dll_Pll_Conf_Fpga()
dump = false;
dump_mat = true;
dump_filename = std::string("./dll_pll_dump.dat");
enable_fll_pull_in = false;
enable_fll_steady_state = false;
pull_in_time_s = 2;
fll_filter_order = 1;
pll_filter_order = 3;
dll_filter_order = 2;
fll_bw_hz = 35.0;
pll_pull_in_bw_hz = 50.0;
dll_pull_in_bw_hz = 3.0;
pll_bw_hz = 35.0;
dll_bw_hz = 2.0;
pll_bw_narrow_hz = 5.0;

11
src/algorithms/tracking/libs/dll_pll_conf_fpga.h
View File

@ -42,11 +42,22 @@ class Dll_Pll_Conf_Fpga
{
public:
/* DLL/PLL tracking configuration */
int fll_filter_order;
bool enable_fll_pull_in;
bool enable_fll_steady_state;
unsigned int pull_in_time_s; // signed integer, when pull in time is not yet reached it has to be compared against a negative number
int pll_filter_order;
int dll_filter_order;
double fs_in;
uint32_t vector_length;
bool dump;
bool dump_mat;
std::string dump_filename;
float pll_pull_in_bw_hz;
float dll_pull_in_bw_hz;
float fll_bw_hz;
float pll_bw_hz;
float dll_bw_hz;
float pll_bw_narrow_hz;

113
src/algorithms/tracking/libs/fpga_multicorrelator.cc
View File

@ -51,9 +51,9 @@
#define CODE_PHASE_STEP_CHIPS_NUM_NBITS CODE_RESAMPLER_NUM_BITS_PRECISION
#define pwrtwo(x) (1 << (x))
#define MAX_CODE_RESAMPLER_COUNTER pwrtwo(CODE_PHASE_STEP_CHIPS_NUM_NBITS) // 2^CODE_PHASE_STEP_CHIPS_NUM_NBITS
#define PHASE_CARR_NBITS 32
#define PHASE_CARR_NBITS_INT 1
#define PHASE_CARR_NBITS_FRAC PHASE_CARR_NBITS - PHASE_CARR_NBITS_INT
#define PHASE_CARR_MAX 2147483648 // 2^(31) The phase is represented as a 32-bit vector in 1.31 format
#define PHASE_CARR_MAX_div_PI 683565275.5764316 // 2^(31)/pi
#define TWO_PI 6.283185307179586
#define LOCAL_CODE_FPGA_CORRELATOR_SELECT_COUNT 0x20000000
#define LOCAL_CODE_FPGA_CLEAR_ADDRESS_COUNTER 0x10000000
#define LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY 0x0C000000
@ -118,6 +118,7 @@ Fpga_Multicorrelator_8sc::Fpga_Multicorrelator_8sc(int32_t n_correlators,
d_data_codes = data_codes;
d_multicorr_type = multicorr_type;
d_code_samples_per_chip = code_samples_per_chip;
d_code_length_samples = d_code_length_chips * d_code_samples_per_chip;
DLOG(INFO) << "TRACKING FPGA CLASS CREATED";
}
@ -171,9 +172,9 @@ void Fpga_Multicorrelator_8sc::set_output_vectors(gr_complex *corr_out, gr_compl
}
void Fpga_Multicorrelator_8sc::update_local_code(float rem_code_phase_chips)
void Fpga_Multicorrelator_8sc::update_local_code()
{
d_rem_code_phase_chips = rem_code_phase_chips;
//d_rem_code_phase_chips = rem_code_phase_chips;
Fpga_Multicorrelator_8sc::fpga_compute_code_shift_parameters();
Fpga_Multicorrelator_8sc::fpga_configure_code_parameters_in_fpga();
}
@ -188,11 +189,12 @@ void Fpga_Multicorrelator_8sc::Carrier_wipeoff_multicorrelator_resampler(
float code_phase_rate_step_chips __attribute__((unused)),
int32_t signal_length_samples)
{
update_local_code(rem_code_phase_chips);
d_rem_code_phase_chips = rem_code_phase_chips;
d_rem_carrier_phase_in_rad = rem_carrier_phase_in_rad;
d_code_phase_step_chips = code_phase_step_chips;
d_phase_step_rad = phase_step_rad;
d_correlator_length_samples = signal_length_samples;
Fpga_Multicorrelator_8sc::update_local_code();
Fpga_Multicorrelator_8sc::fpga_compute_signal_parameters_in_fpga();
Fpga_Multicorrelator_8sc::fpga_configure_signal_parameters_in_fpga();
Fpga_Multicorrelator_8sc::fpga_launch_multicorrelator_fpga();
@ -298,88 +300,72 @@ uint32_t Fpga_Multicorrelator_8sc::fpga_acquisition_test_register(
void Fpga_Multicorrelator_8sc::fpga_configure_tracking_gps_local_code(int32_t PRN)
{
uint32_t k;
uint32_t code_chip;
uint32_t select_pilot_corelator = LOCAL_CODE_FPGA_CORRELATOR_SELECT_COUNT;
d_map_base[PROG_MEMS_ADDR] = LOCAL_CODE_FPGA_CLEAR_ADDRESS_COUNTER;
for (k = 0; k < d_code_length_chips * d_code_samples_per_chip; k++)
for (k = 0; k < d_code_length_samples; k++)
{
if (d_ca_codes[((int32_t(d_code_length_chips)) * d_code_samples_per_chip * (PRN - 1)) + k] == 1)
{
code_chip = 1;
}
else
{
code_chip = 0;
}
// copy the local code to the FPGA memory one by one
d_map_base[PROG_MEMS_ADDR] = LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY | code_chip; // | select_fpga_correlator;
d_map_base[PROG_MEMS_ADDR] = d_ca_codes[(d_code_length_samples * (PRN - 1)) + k];
}
if (d_track_pilot)
{
d_map_base[PROG_MEMS_ADDR] = LOCAL_CODE_FPGA_CLEAR_ADDRESS_COUNTER;
for (k = 0; k < d_code_length_chips * d_code_samples_per_chip; k++)
for (k = 0; k < d_code_length_samples; k++)
{
if (d_data_codes[((int32_t(d_code_length_chips)) * d_code_samples_per_chip * (PRN - 1)) + k] == 1)
{
code_chip = 1;
}
else
{
code_chip = 0;
}
d_map_base[PROG_MEMS_ADDR] = LOCAL_CODE_FPGA_ENABLE_WRITE_MEMORY | code_chip | select_pilot_corelator;
d_map_base[PROG_MEMS_ADDR] = d_data_codes[(d_code_length_samples * (PRN - 1)) + k];
}
}
d_map_base[CODE_LENGTH_MINUS_1_REG_ADDR] = (d_code_length_samples)-1; // number of samples - 1
}
void Fpga_Multicorrelator_8sc::fpga_compute_code_shift_parameters(void)
{
float temp_calculation;
int32_t i;
float frac_part; // decimal part
int32_t dec_part; // fractional part
for (i = 0; i < d_n_correlators; i++)
for (uint32_t i = 0; i < d_n_correlators; i++)
{
temp_calculation = floor(d_shifts_chips[i] - d_rem_code_phase_chips);
dec_part = floor(d_shifts_chips[i] - d_rem_code_phase_chips);
if (temp_calculation < 0)
if (dec_part < 0)
{
temp_calculation = temp_calculation + (d_code_length_chips * d_code_samples_per_chip); // % operator does not work as in Matlab with negative numbers
dec_part = dec_part + d_code_length_samples; // % operator does not work as in Matlab with negative numbers
}
d_initial_index[i] = static_cast<uint32_t>((static_cast<int32_t>(temp_calculation)) % (d_code_length_chips * d_code_samples_per_chip));
temp_calculation = fmod(d_shifts_chips[i] - d_rem_code_phase_chips, 1.0);
if (temp_calculation < 0)
d_initial_index[i] = dec_part;
frac_part = fmod(d_shifts_chips[i] - d_rem_code_phase_chips, 1.0);
if (frac_part < 0)
{
temp_calculation = temp_calculation + 1.0; // fmod operator does not work as in Matlab with negative numbers
frac_part = frac_part + 1.0; // fmod operator does not work as in Matlab with negative numbers
}
d_initial_interp_counter[i] = static_cast<uint32_t>(floor(MAX_CODE_RESAMPLER_COUNTER * temp_calculation));
d_initial_interp_counter[i] = static_cast<uint32_t>(floor(MAX_CODE_RESAMPLER_COUNTER * frac_part));
}
if (d_track_pilot)
{
temp_calculation = floor(d_prompt_data_shift[0] - d_rem_code_phase_chips);
dec_part = floor(d_prompt_data_shift[0] - d_rem_code_phase_chips);
if (temp_calculation < 0)
if (dec_part < 0)
{
temp_calculation = temp_calculation + (d_code_length_chips * d_code_samples_per_chip); // % operator does not work as in Matlab with negative numbers
dec_part = dec_part + d_code_length_samples; // % operator does not work as in Matlab with negative numbers
}
d_initial_index[d_n_correlators] = static_cast<uint32_t>((static_cast<int32_t>(temp_calculation)) % (d_code_length_chips * d_code_samples_per_chip));
temp_calculation = fmod(d_prompt_data_shift[0] - d_rem_code_phase_chips, 1.0);
if (temp_calculation < 0)
d_initial_index[d_n_correlators] = dec_part;
frac_part = fmod(d_prompt_data_shift[0] - d_rem_code_phase_chips, 1.0);
if (frac_part < 0)
{
temp_calculation = temp_calculation + 1.0; // fmod operator does not work as in Matlab with negative numbers
frac_part = frac_part + 1.0; // fmod operator does not work as in Matlab with negative numbers
}
d_initial_interp_counter[d_n_correlators] = static_cast<uint32_t>(floor(MAX_CODE_RESAMPLER_COUNTER * temp_calculation));
d_initial_interp_counter[d_n_correlators] = static_cast<uint32_t>(floor(MAX_CODE_RESAMPLER_COUNTER * frac_part));
}
}
void Fpga_Multicorrelator_8sc::fpga_configure_code_parameters_in_fpga(void)
{
int32_t i;
for (i = 0; i < d_n_correlators; i++)
for (uint32_t i = 0; i < d_n_correlators; i++)
{
d_map_base[INITIAL_INDEX_REG_BASE_ADDR + i] = d_initial_index[i];
d_map_base[INITIAL_INTERP_COUNTER_REG_BASE_ADDR + i] = d_initial_interp_counter[i];
@ -389,8 +375,6 @@ void Fpga_Multicorrelator_8sc::fpga_configure_code_parameters_in_fpga(void)
d_map_base[INITIAL_INDEX_REG_BASE_ADDR + d_n_correlators] = d_initial_index[d_n_correlators];
d_map_base[INITIAL_INTERP_COUNTER_REG_BASE_ADDR + d_n_correlators] = d_initial_interp_counter[d_n_correlators];
}
d_map_base[CODE_LENGTH_MINUS_1_REG_ADDR] = (d_code_length_chips * d_code_samples_per_chip) - 1; // number of samples - 1
}
@ -399,34 +383,22 @@ void Fpga_Multicorrelator_8sc::fpga_compute_signal_parameters_in_fpga(void)
float d_rem_carrier_phase_in_rad_temp;
d_code_phase_step_chips_num = static_cast<uint32_t>(roundf(MAX_CODE_RESAMPLER_COUNTER * d_code_phase_step_chips));
if (d_code_phase_step_chips > 1.0)
{
std::cout << "Warning : d_code_phase_step_chips = " << d_code_phase_step_chips << " cannot be bigger than one" << std::endl;
}
if (d_rem_carrier_phase_in_rad > M_PI)
{
d_rem_carrier_phase_in_rad_temp = -2 * M_PI + d_rem_carrier_phase_in_rad;
d_rem_carrier_phase_in_rad_temp = -TWO_PI + d_rem_carrier_phase_in_rad;
}
else if (d_rem_carrier_phase_in_rad < -M_PI)
{
d_rem_carrier_phase_in_rad_temp = 2 * M_PI + d_rem_carrier_phase_in_rad;
d_rem_carrier_phase_in_rad_temp = TWO_PI + d_rem_carrier_phase_in_rad;
}
else
{
d_rem_carrier_phase_in_rad_temp = d_rem_carrier_phase_in_rad;
}
d_rem_carr_phase_rad_int = static_cast<int32_t>(roundf((fabs(d_rem_carrier_phase_in_rad_temp) / M_PI) * pow(2, PHASE_CARR_NBITS_FRAC)));
if (d_rem_carrier_phase_in_rad_temp < 0)
{
d_rem_carr_phase_rad_int = -d_rem_carr_phase_rad_int;
}
d_phase_step_rad_int = static_cast<int32_t>(roundf((fabs(d_phase_step_rad) / M_PI) * pow(2, PHASE_CARR_NBITS_FRAC))); // the FPGA accepts a range for the phase step between -pi and +pi
if (d_phase_step_rad < 0)
{
d_phase_step_rad_int = -d_phase_step_rad_int;
}
d_rem_carr_phase_rad_int = static_cast<int32_t>(roundf((d_rem_carrier_phase_in_rad_temp)*PHASE_CARR_MAX_div_PI));
d_phase_step_rad_int = static_cast<int32_t>(roundf((d_phase_step_rad)*PHASE_CARR_MAX_div_PI)); // the FPGA accepts a range for the phase step between -pi and +pi
}
@ -460,9 +432,8 @@ void Fpga_Multicorrelator_8sc::read_tracking_gps_results(void)
{
int32_t readval_real;
int32_t readval_imag;
int32_t k;
for (k = 0; k < d_n_correlators; k++)
for (uint32_t k = 0; k < d_n_correlators; k++)
{
readval_real = d_map_base[RESULT_REG_REAL_BASE_ADDR + k];
readval_imag = d_map_base[RESULT_REG_IMAG_BASE_ADDR + k];

7
src/algorithms/tracking/libs/fpga_multicorrelator.h
View File

@ -77,7 +77,7 @@ public:
void set_output_vectors(gr_complex *corr_out, gr_complex *Prompt_Data);
void set_local_code_and_taps(
float *shifts_chips, float *prompt_data_shift, int32_t PRN);
void update_local_code(float rem_code_phase_chips);
void update_local_code();
void Carrier_wipeoff_multicorrelator_resampler(
float rem_carrier_phase_in_rad, float phase_step_rad,
float carrier_phase_rate_step_rad,
@ -96,8 +96,9 @@ private:
gr_complex *d_Prompt_Data;
float *d_shifts_chips;
float *d_prompt_data_shift;
int32_t d_code_length_chips;
int32_t d_n_correlators; // number of correlators
uint32_t d_code_length_chips;
uint32_t d_code_length_samples;
uint32_t d_n_correlators; // number of correlators
// data related to the hardware module and the driver
int32_t d_device_descriptor; // driver descriptor

93
src/core/libs/gnss_sdr_fpga_sample_counter.cc
View File

@ -2,11 +2,12 @@
* \file gnss_sdr_fpga_sample_counter.cc
* \brief Simple block to report the current receiver time based on the output
* of the tracking or telemetry blocks
* \author Marc Majoral 2019. mmajoral(at)cttc.es
* \author Javier Arribas 2018. jarribas(at)cttc.es
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2018 (see AUTHORS file for a list of contributors)
* Copyright (C) 2010-2019 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
@ -69,19 +70,17 @@ gnss_sdr_fpga_sample_counter::gnss_sdr_fpga_sample_counter(
interval_ms = _interval_ms;
fs = _fs;
samples_per_output = std::round(fs * static_cast<double>(interval_ms) / 1e3);
//todo: Load here the hardware counter register with this amount of samples. It should produce an
//interrupt every samples_per_output count.
//The hardware timer must keep always interrupting the PS. It must not wait for the interrupt to
//be served.
open_device();
is_open = true;
sample_counter = 0ULL;
last_sample_counter = 0ULL;
current_T_rx_ms = 0;
current_s = 0;
current_m = 0;
current_h = 0;
current_days = 0;
report_interval_ms = 1000; // default reporting 1 second
samples_per_report = std::round(fs * static_cast<double>(report_interval_ms) / 1e3);
flag_enable_send_msg = false; // enable it for reporting time with asynchronous message
flag_m = false;
flag_h = false;
@ -105,11 +104,9 @@ gnss_sdr_fpga_sample_counter::~gnss_sdr_fpga_sample_counter()
}
// Called by gnuradio to enable drivers, etc for i/o devices.
// Called by GNU Radio to enable drivers, etc for i/o devices.
bool gnss_sdr_fpga_sample_counter::start()
{
//todo: place here the RE-INITIALIZATION routines. This function will be called by GNURadio at every start of the flowgraph.
// configure the number of samples per output in the FPGA and enable the interrupts
configure_samples_per_output(samples_per_output);
@ -118,11 +115,9 @@ bool gnss_sdr_fpga_sample_counter::start()
}
// Called by GNURadio to disable drivers, etc for i/o devices.
// Called by GNU Radio to disable drivers, etc for i/o devices.
bool gnss_sdr_fpga_sample_counter::stop()
{
//todo: place here the routines to stop the associated hardware (if needed).This function will be called by GNURadio at every stop of the flowgraph.
// return true if everything is ok.
close_device();
is_open = false;
return true;
@ -194,65 +189,31 @@ void gnss_sdr_fpga_sample_counter::close_device()
}
uint32_t gnss_sdr_fpga_sample_counter::wait_for_interrupt_and_read_counter()
{
int32_t irq_count;
ssize_t nb;
int32_t counter;
// enable interrupts
int32_t reenable = 1;
ssize_t nbytes = TEMP_FAILURE_RETRY(write(fd, reinterpret_cast<void *>(&reenable), sizeof(int32_t)));
if (nbytes != sizeof(int32_t))
{
std::cerr << "Error enabling interruptions in the FPGA." << std::endl;
}
// wait for interrupt
nb = read(fd, &irq_count, sizeof(irq_count));
if (nb != sizeof(irq_count))
{
std::cout << "FPGA sample counter module read failed to retrieve 4 bytes!" << std::endl;
std::cout << "FPGA sample counter module interrupt number " << irq_count << std::endl;
}
// it is a rising edge interrupt, the interrupt does not need to be acknowledged
//map_base[1] = 0; // writing anything to reg 1 acknowledges the interrupt
// add number of passed samples or read the current counter value for more accuracy
counter = samples_per_output; //map_base[0];
return counter;
}
int gnss_sdr_fpga_sample_counter::general_work(int noutput_items __attribute__((unused)),
__attribute__((unused)) gr_vector_int &ninput_items,
__attribute__((unused)) gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
//todo: Call here a function that waits for an interrupt. Do not open a thread,
//it must be a simple call to a BLOCKING function.
// The function will return the actual absolute sample count of the internal counter of the timmer.
// store the sample count in class member sample_counter
// Possible problem: what happen if the PS is overloaded and gnuradio does not call this function
// with the sufficient rate to catch all the interrupts in the counter. To be evaluated later.
wait_for_interrupt();
uint32_t counter = wait_for_interrupt_and_read_counter();
uint64_t samples_passed = 2 * static_cast<uint64_t>(samples_per_output) - static_cast<uint64_t>(counter); // ellapsed samples
// Note: at this moment the sample counter is implemented as a sample counter that decreases to zero and then it is automatically
// reloaded again and keeps counter. It is done in this way to minimize the logic in the FPGA and maximize the FPGA clock performance
// (it takes less resources and latency in the FPGA to compare a number against a fixed value like zero than to compare it to a programmable
// variable number).
uint64_t sample_counter_tmp, sample_counter_msw_tmp;
sample_counter_tmp = map_base[0];
sample_counter_msw_tmp = map_base[1];
sample_counter_msw_tmp = sample_counter_msw_tmp << 32;
sample_counter_tmp = sample_counter_tmp + sample_counter_msw_tmp; // 2^32
sample_counter = sample_counter_tmp;
sample_counter = sample_counter + samples_passed; //samples_per_output;
auto *out = reinterpret_cast<Gnss_Synchro *>(output_items[0]);
out[0] = Gnss_Synchro();
out[0].Flag_valid_symbol_output = false;
out[0].Flag_valid_word = false;
out[0].Channel_ID = -1;
out[0].fs = fs;
if ((current_T_rx_ms % report_interval_ms) == 0)
if ((sample_counter - last_sample_counter) > samples_per_report)
{
last_sample_counter = sample_counter;
current_s++;
if ((current_s % 60) == 0)
{
@ -310,7 +271,25 @@ int gnss_sdr_fpga_sample_counter::general_work(int noutput_items __attribute__((
}
}
out[0].Tracking_sample_counter = sample_counter;
//current_T_rx_ms = (sample_counter * 1000) / samples_per_output;
current_T_rx_ms = interval_ms * (sample_counter) / samples_per_output;
return 1;
}
void gnss_sdr_fpga_sample_counter::wait_for_interrupt()
{
int32_t irq_count;
ssize_t nb;
// enable interrupts
int32_t reenable = 1;
write(fd, reinterpret_cast<void *>(&reenable), sizeof(int32_t));
// wait for interrupt
nb = read(fd, &irq_count, sizeof(irq_count));
if (nb != sizeof(irq_count))
{
std::cout << "fpga sample counter module read failed to retrieve 4 bytes!" << std::endl;
std::cout << "fpga sample counter module interrupt number " << irq_count << std::endl;
}
}

7
src/core/libs/gnss_sdr_fpga_sample_counter.h
View File

@ -55,11 +55,15 @@ private:
void close_device(void);
void open_device(void);
bool start();
bool stop();
uint32_t wait_for_interrupt_and_read_counter(void);
void wait_for_interrupt(void);
uint32_t samples_per_output;
uint32_t samples_per_report;
double fs;
uint64_t sample_counter;
uint64_t last_sample_counter;
uint32_t interval_ms;
uint64_t current_T_rx_ms; // Receiver time in ms since the beginning of the run
uint32_t current_s; // Receiver time in seconds, modulo 60
@ -70,6 +74,7 @@ private:
bool flag_days; // True if the receiver has been running for at least 1 day
uint32_t current_days; // Receiver time in days since the beginning of the run
int32_t report_interval_ms;
bool flag_enable_send_msg;
int32_t fd; // driver descriptor
volatile uint32_t *map_base; // driver memory map

38
src/utils/matlab/libs/plotVEMLTracking.m
View File

@ -63,7 +63,13 @@ for channelNr = channelList
%% Plot all figures =======================================================
timeAxisInSeconds = (1:4:settings.msToProcess)/1000;
if isfield(trackResults(channelNr), 'prn_start_time_s')
timeAxis=trackResults(channelNr).prn_start_time_s;
time_label='RX Time (s)';
else
timeAxis = (1:length(trackResults(channelNr).PRN));
time_label='Epoch';
end
%----- Discrete-Time Scatter Plot ---------------------------------
plot(handles(1, 1), trackResults(channelNr).data_I,...
@ -77,29 +83,26 @@ for channelNr = channelList
ylabel(handles(1, 1), 'Q prompt');
%----- Nav bits ---------------------------------------------------
t = (1:length(trackResults(channelNr).data_I));
plot (handles(1, 2), t, ...
plot (handles(1, 2), timeAxis, ...
trackResults(channelNr).data_I);
grid (handles(1, 2));
title (handles(1, 2), 'Bits of the navigation message');
xlabel(handles(1, 2), 'Time (s)');
xlabel(handles(1, 2), time_label);
axis (handles(1, 2), 'tight');
%----- PLL discriminator unfiltered--------------------------------
t = (1:length(trackResults(channelNr).pllDiscr));
plot (handles(2, 1), t, ...
plot (handles(2, 1), timeAxis, ...
trackResults(channelNr).pllDiscr, 'r');
grid (handles(2, 1));
axis (handles(2, 1), 'tight');
xlabel(handles(2, 1), 'Time (s)');
xlabel(handles(2, 1), time_label);
ylabel(handles(2, 1), 'Amplitude');
title (handles(2, 1), 'Raw PLL discriminator');
%----- Correlation ------------------------------------------------
t = (1:length(trackResults(channelNr).I_VE));
plot(handles(2, 2), t, ...
plot(handles(2, 2), timeAxis, ...
[sqrt(trackResults(channelNr).I_VE.^2 + ...
trackResults(channelNr).Q_VE.^2)', ...
sqrt(trackResults(channelNr).I_E.^2 + ...
@ -114,7 +117,7 @@ for channelNr = channelList
grid (handles(2, 2));
title (handles(2, 2), 'Correlation results');
xlabel(handles(2, 2), 'Time (s)');
xlabel(handles(2, 2), time_label);
axis (handles(2, 2), 'tight');
hLegend = legend(handles(2, 2), '$\sqrt{I_{VE}^2 + Q_{VE}^2}$', ...
@ -127,35 +130,32 @@ for channelNr = channelList
set(hLegend, 'Interpreter', 'Latex');
%----- PLL discriminator filtered----------------------------------
t = (1:length(trackResults(channelNr).pllDiscrFilt));
plot (handles(3, 1), t, ...
plot (handles(3, 1), timeAxis, ...
trackResults(channelNr).pllDiscrFilt, 'b');
grid (handles(3, 1));
axis (handles(3, 1), 'tight');
xlabel(handles(3, 1), 'Time (s)');
xlabel(handles(3, 1), time_label);
ylabel(handles(3, 1), 'Amplitude');
title (handles(3, 1), 'Filtered PLL discriminator');
%----- DLL discriminator unfiltered--------------------------------
t = (1:length(trackResults(channelNr).dllDiscr));
plot (handles(3, 2), t, ...
plot (handles(3, 2), timeAxis, ...
trackResults(channelNr).dllDiscr, 'r');
grid (handles(3, 2));
axis (handles(3, 2), 'tight');
xlabel(handles(3, 2), 'Time (s)');
xlabel(handles(3, 2), time_label);
ylabel(handles(3, 2), 'Amplitude');
title (handles(3, 2), 'Raw DLL discriminator');
%----- DLL discriminator filtered----------------------------------
t = (1:length(trackResults(channelNr).dllDiscrFilt));
plot (handles(3, 3), t, ...
plot (handles(3, 3), timeAxis, ...
trackResults(channelNr).dllDiscrFilt, 'b');
grid (handles(3, 3));
axis (handles(3, 3), 'tight');
xlabel(handles(3, 3), 'Time (s)');
xlabel(handles(3, 3), time_label);
ylabel(handles(3, 3), 'Amplitude');
title (handles(3, 3), 'Filtered DLL discriminator');