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This commit is contained in:
Carles Fernandez 2018-04-30 20:15:00 +02:00
parent bd81330201
commit faf27fff22
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GPG Key ID: 4C583C52B0C3877D
3 changed files with 61 additions and 62 deletions
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49
src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition_fpga.cc
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@ -33,15 +33,17 @@
*
* -------------------------------------------------------------------------
*/
#include <new>
#include "configuration_interface.h"
#include "gnss_sdr_flags.h"
#include "gps_l1_ca_pcps_acquisition_fpga.h"
#include "gps_sdr_signal_processing.h"
#include "GPS_L1_CA.h"
#include <gnuradio/fft/fft.h>
#include <volk/volk.h>
#include <glog/logging.h>
#include "gps_l1_ca_pcps_acquisition_fpga.h"
#include "configuration_interface.h"
#include "gps_sdr_signal_processing.h"
#include "GPS_L1_CA.h"
#include "gnss_sdr_flags.h"
#include <new>
#define NUM_PRNs 32
@ -70,10 +72,10 @@ GpsL1CaPcpsAcquisitionFpga::GpsL1CaPcpsAcquisitionFpga(
unsigned int code_length = static_cast<unsigned int>(std::round(static_cast<double>(fs_in) / (GPS_L1_CA_CODE_RATE_HZ / GPS_L1_CA_CODE_LENGTH_CHIPS)));
// The FPGA can only use FFT lengths that are a power of two.
float nbits = ceilf(log2f((float) code_length));
float nbits = ceilf(log2f((float)code_length));
unsigned int nsamples_total = pow(2, nbits);
unsigned int vector_length = nsamples_total * sampled_ms;
unsigned int select_queue_Fpga = configuration_->property(role + ".select_queue_Fpga",0);
unsigned int select_queue_Fpga = configuration_->property(role + ".select_queue_Fpga", 0);
acq_parameters.select_queue_Fpga = select_queue_Fpga;
std::string default_device_name = "/dev/uio0";
std::string device_name = configuration_->property(role + ".devicename", default_device_name);
@ -84,27 +86,27 @@ GpsL1CaPcpsAcquisitionFpga::GpsL1CaPcpsAcquisitionFpga(
// 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)
gr::fft::fft_complex* fft_if = new gr::fft::fft_complex(vector_length, true); // Direct FFT
gr::fft::fft_complex* fft_if = new gr::fft::fft_complex(vector_length, true); // Direct FFT
// allocate memory to compute all the PRNs and compute all the possible codes
std::complex<float>* code = new std::complex<float>[nsamples_total]; // buffer for the local code
std::complex<float>* code = new std::complex<float>[nsamples_total]; // buffer for the local code
gr_complex* 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 lv_16sc_t[nsamples_total * NUM_PRNs]; // memory containing all the possible fft codes for PRN 0 to 32
float max; // temporary maxima search
for (unsigned int PRN = 1; PRN <= NUM_PRNs; PRN++)
{
gps_l1_ca_code_gen_complex_sampled(code, PRN, fs_in, 0); // generate PRN code
gps_l1_ca_code_gen_complex_sampled(code, PRN, fs_in, 0); // generate PRN code
// fill in zero padding
for (int s=code_length;s<nsamples_total;s++)
for (int s = code_length; s < nsamples_total; s++)
{
code[s] = 0;
}
int offset = 0;
memcpy(fft_if->get_inbuf() + offset, code, sizeof(gr_complex) * nsamples_total); // copy to FFT buffer
fft_if->execute(); // Run the FFT of local code
volk_32fc_conjugate_32fc(fft_codes_padded, fft_if->get_outbuf(), nsamples_total); // conjugate values
max = 0; // initialize maximum value
for (unsigned int i = 0; i < nsamples_total; i++) // search for maxima
memcpy(fft_if->get_inbuf() + offset, code, sizeof(gr_complex) * nsamples_total); // copy to FFT buffer
fft_if->execute(); // Run the FFT of local code
volk_32fc_conjugate_32fc(fft_codes_padded, fft_if->get_outbuf(), nsamples_total); // conjugate values
max = 0; // initialize maximum value
for (unsigned int i = 0; i < nsamples_total; i++) // search for maxima
{
if (std::abs(fft_codes_padded[i].real()) > max)
{
@ -115,13 +117,12 @@ GpsL1CaPcpsAcquisitionFpga::GpsL1CaPcpsAcquisitionFpga(
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
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
{
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)));
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)));
}
}
}
//acq_parameters

6
src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition_fpga.h
View File

@ -37,11 +37,10 @@
#ifndef GNSS_SDR_GPS_L1_CA_PCPS_ACQUISITION_FPGA_H_
#define GNSS_SDR_GPS_L1_CA_PCPS_ACQUISITION_FPGA_H_
#include <string>
#include "acquisition_interface.h"
#include "gnss_synchro.h"
#include "pcps_acquisition_fpga.h"
#include <string>
class ConfigurationInterface;
@ -144,8 +143,7 @@ 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
lv_16sc_t* d_all_fft_codes_; // memory that contains all the code ffts
};
#endif /* GNSS_SDR_GPS_L1_CA_PCPS_ACQUISITION_FPGA_H_ */

68
src/algorithms/libs/CMakeLists.txt
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@ -42,7 +42,7 @@ if(ENABLE_FPGA)
conjugate_ic.cc
)
else(ENABLE_FPGA)
set(GNSS_SPLIBS_SOURCES
set(GNSS_SPLIBS_SOURCES
gps_l2c_signal.cc
gps_l5_signal.cc
galileo_e1_signal_processing.cc
@ -62,38 +62,38 @@ else(ENABLE_FPGA)
conjugate_cc.cc
conjugate_sc.cc
conjugate_ic.cc
)
)
endif(ENABLE_FPGA)
if(OPENCL_FOUND)
set(GNSS_SPLIBS_SOURCES ${GNSS_SPLIBS_SOURCES}
opencl/fft_execute.cc # Needs OpenCL
opencl/fft_setup.cc # Needs OpenCL
opencl/fft_kernelstring.cc # Needs OpenCL
)
set(GNSS_SPLIBS_SOURCES ${GNSS_SPLIBS_SOURCES}
opencl/fft_execute.cc # Needs OpenCL
opencl/fft_setup.cc # Needs OpenCL
opencl/fft_kernelstring.cc # Needs OpenCL
)
endif(OPENCL_FOUND)
include_directories(
${CMAKE_CURRENT_SOURCE_DIR}
${CMAKE_SOURCE_DIR}/src/core/system_parameters
${CMAKE_SOURCE_DIR}/src/core/receiver
${CMAKE_SOURCE_DIR}/src/core/interfaces
${Boost_INCLUDE_DIRS}
${GLOG_INCLUDE_DIRS}
${GFlags_INCLUDE_DIRS}
${GNURADIO_RUNTIME_INCLUDE_DIRS}
${GNURADIO_BLOCKS_INCLUDE_DIRS}
${VOLK_INCLUDE_DIRS}
${VOLK_GNSSSDR_INCLUDE_DIRS}
${CMAKE_CURRENT_SOURCE_DIR}
${CMAKE_SOURCE_DIR}/src/core/system_parameters
${CMAKE_SOURCE_DIR}/src/core/receiver
${CMAKE_SOURCE_DIR}/src/core/interfaces
${Boost_INCLUDE_DIRS}
${GLOG_INCLUDE_DIRS}
${GFlags_INCLUDE_DIRS}
${GNURADIO_RUNTIME_INCLUDE_DIRS}
${GNURADIO_BLOCKS_INCLUDE_DIRS}
${VOLK_INCLUDE_DIRS}
${VOLK_GNSSSDR_INCLUDE_DIRS}
)
if(OPENCL_FOUND)
include_directories( ${OPENCL_INCLUDE_DIRS} )
if(OS_IS_MACOSX)
set(OPT_LIBRARIES ${OPT_LIBRARIES} "-framework OpenCL")
else(OS_IS_MACOSX)
set(OPT_LIBRARIES ${OPT_LIBRARIES} ${OPENCL_LIBRARIES})
endif(OS_IS_MACOSX)
include_directories( ${OPENCL_INCLUDE_DIRS} )
if(OS_IS_MACOSX)
set(OPT_LIBRARIES ${OPT_LIBRARIES} "-framework OpenCL")
else(OS_IS_MACOSX)
set(OPT_LIBRARIES ${OPT_LIBRARIES} ${OPENCL_LIBRARIES})
endif(OS_IS_MACOSX)
endif(OPENCL_FOUND)
add_definitions(-DGNSSSDR_INSTALL_DIR="${CMAKE_INSTALL_PREFIX}")
@ -105,22 +105,22 @@ add_library(gnss_sp_libs ${GNSS_SPLIBS_SOURCES} ${GNSS_SPLIBS_HEADERS})
source_group(Headers FILES ${GNSS_SPLIBS_HEADERS})
target_link_libraries(gnss_sp_libs ${GNURADIO_RUNTIME_LIBRARIES}
${VOLK_LIBRARIES} ${ORC_LIBRARIES}
${VOLK_GNSSSDR_LIBRARIES} ${ORC_LIBRARIES}
${GFlags_LIBS}
${GNURADIO_BLOCKS_LIBRARIES}
${GNURADIO_FFT_LIBRARIES}
${GNURADIO_FILTER_LIBRARIES}
${OPT_LIBRARIES}
gnss_rx
${VOLK_LIBRARIES} ${ORC_LIBRARIES}
${VOLK_GNSSSDR_LIBRARIES} ${ORC_LIBRARIES}
${GFlags_LIBS}
${GNURADIO_BLOCKS_LIBRARIES}
${GNURADIO_FFT_LIBRARIES}
${GNURADIO_FILTER_LIBRARIES}
${OPT_LIBRARIES}
gnss_rx
)
if(NOT VOLK_GNSSSDR_FOUND)
add_dependencies(gnss_sp_libs volk_gnsssdr_module)
add_dependencies(gnss_sp_libs volk_gnsssdr_module)
endif(NOT VOLK_GNSSSDR_FOUND)
if(${GFLAGS_GREATER_20})
add_definitions(-DGFLAGS_GREATER_2_0=1)
add_definitions(-DGFLAGS_GREATER_2_0=1)
endif(${GFLAGS_GREATER_20})
add_library(gnss_sdr_flags gnss_sdr_flags.cc gnss_sdr_flags.h)