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Adding experimental KF carrier tracking

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This commit is contained in:
Javier 2018-03-13 11:51:33 +02:00
parent 07b25ebb06
commit 70a2690a2a
8 changed files with 1286 additions and 0 deletions
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211
conf/gnss-sdr_GPS_L1_nsr_kf.conf Normal file
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@ -0,0 +1,211 @@
; Default configuration file
; You can define your own receiver and invoke it by doing
; gnss-sdr --config_file=my_GNSS_SDR_configuration.conf
;
[GNSS-SDR]
;######### GLOBAL OPTIONS ##################
;internal_fs_sps: Internal signal sampling frequency after the signal conditioning stage [samples per second].
;GNSS-SDR.internal_fs_sps=6826700
GNSS-SDR.internal_fs_sps=2560000
;GNSS-SDR.internal_fs_sps=4096000
;GNSS-SDR.internal_fs_sps=5120000
;######### SIGNAL_SOURCE CONFIG ############
;#implementation: Use [File_Signal_Source] [Nsr_File_Signal_Source] or [UHD_Signal_Source] or [GN3S_Signal_Source] (experimental)
SignalSource.implementation=Nsr_File_Signal_Source
;#filename: path to file with the captured GNSS signal samples to be processed
SignalSource.filename=/home/javier/signals/ifen/E1L1_FE0_Band0.stream ; <- PUT YOUR FILE HERE
;#item_type: Type and resolution for each of the signal samples. Use only gr_complex in this version.
SignalSource.item_type=byte
;#sampling_frequency: Original Signal sampling frequency in [Hz]
SignalSource.sampling_frequency=20480000
;#freq: RF front-end center frequency in [Hz]
SignalSource.freq=1575420000
;#samples: Number of samples to be processed. Notice that 0 indicates the entire file.
SignalSource.samples=0
;#repeat: Repeat the processing file. Disable this option in this version
SignalSource.repeat=false
;#dump: Dump the Signal source data to a file. Disable this option in this version
SignalSource.dump=false
SignalSource.dump_filename=../data/signal_source.dat
;#enable_throttle_control: Enabling this option tells the signal source to keep the delay between samples in post processing.
; it helps to not overload the CPU, but the processing time will be longer.
SignalSource.enable_throttle_control=false
;######### SIGNAL_CONDITIONER CONFIG ############
;## It holds blocks to change data type, filter and resample input data.
;#implementation: Use [Pass_Through] or [Signal_Conditioner]
;#[Pass_Through] disables this block and the [DataTypeAdapter], [InputFilter] and [Resampler] blocks
;#[Signal_Conditioner] enables this block. Then you have to configure [DataTypeAdapter], [InputFilter] and [Resampler] blocks
SignalConditioner.implementation=Signal_Conditioner
;######### DATA_TYPE_ADAPTER CONFIG ############
;## Changes the type of input data.
;#implementation: [Pass_Through] disables this block
DataTypeAdapter.implementation=Pass_Through
DataTypeAdapter.item_type=float
;######### INPUT_FILTER CONFIG ############
;## Filter the input data. Can be combined with frequency translation for IF signals
;#implementation: Use [Pass_Through] or [Fir_Filter] or [Freq_Xlating_Fir_Filter]
;#[Freq_Xlating_Fir_Filter] enables FIR filter and a composite frequency translation
;# that shifts IF down to zero Hz.
InputFilter.implementation=Freq_Xlating_Fir_Filter
;#dump: Dump the filtered data to a file.
InputFilter.dump=false
;#dump_filename: Log path and filename.
InputFilter.dump_filename=../data/input_filter.dat
;#The following options are used in the filter design of Fir_Filter and Freq_Xlating_Fir_Filter implementation.
;#These options are based on parameters of gnuradio's function: gr_remez.
;#These function calculates the optimal (in the Chebyshev/minimax sense) FIR filter inpulse
;#reponse given a set of band edges, the desired reponse on those bands,
;#and the weight given to the error in those bands.
;#input_item_type: Type and resolution for input signal samples. Use only gr_complex in this version.
InputFilter.input_item_type=float
;#outut_item_type: Type and resolution for output filtered signal samples. Use only gr_complex in this version.
InputFilter.output_item_type=gr_complex
;#taps_item_type: Type and resolution for the taps of the filter. Use only float in this version.
InputFilter.taps_item_type=float
;#number_of_taps: Number of taps in the filter. Increasing this parameter increases the processing time
InputFilter.number_of_taps=5
;#number_of _bands: Number of frequency bands in the filter.
InputFilter.number_of_bands=2
;#bands: frequency at the band edges [ b1 e1 b2 e2 b3 e3 ...].
;#Frequency is in the range [0, 1], with 1 being the Nyquist frequency (Fs/2)
;#The number of band_begin and band_end elements must match the number of bands
InputFilter.band1_begin=0.0
InputFilter.band1_end=0.45
InputFilter.band2_begin=0.55
InputFilter.band2_end=1.0
;#ampl: desired amplitude at the band edges [ a(b1) a(e1) a(b2) a(e2) ...].
;#The number of ampl_begin and ampl_end elements must match the number of bands
InputFilter.ampl1_begin=1.0
InputFilter.ampl1_end=1.0
InputFilter.ampl2_begin=0.0
InputFilter.ampl2_end=0.0
;#band_error: weighting applied to each band (usually 1).
;#The number of band_error elements must match the number of bands
InputFilter.band1_error=1.0
InputFilter.band2_error=1.0
;#filter_type: one of "bandpass", "hilbert" or "differentiator"
InputFilter.filter_type=bandpass
;#grid_density: determines how accurately the filter will be constructed.
;The minimum value is 16; higher values are slower to compute the filter.
InputFilter.grid_density=16
;# Original sampling frequency stored in the signal file
InputFilter.sampling_frequency=20480000
;#The following options are used only in Freq_Xlating_Fir_Filter implementation.
;#InputFilter.IF is the intermediate frequency (in Hz) shifted down to zero Hz
InputFilter.IF=5499998.47412109
;# Decimation factor after the frequency tranaslating block
InputFilter.decimation_factor=8
;######### RESAMPLER CONFIG ############
;## Resamples the input data.
;#implementation: Use [Pass_Through] or [Direct_Resampler]
;#[Pass_Through] disables this block
;#[Direct_Resampler] enables a resampler that implements a nearest neigbourhood interpolation
Resampler.implementation=Pass_Through
;######### CHANNELS GLOBAL CONFIG ############
;#count: Number of available GPS satellite channels.
Channels_1C.count=8
Channels.in_acquisition=1
#Channel.signal=1C
;######### ACQUISITION GLOBAL CONFIG ############
Acquisition_1C.dump=false
Acquisition_1C.dump_filename=./acq_dump.dat
Acquisition_1C.item_type=gr_complex
Acquisition_1C.if=0
Acquisition_1C.sampled_ms=1
Acquisition_1C.implementation=GPS_L1_CA_PCPS_Acquisition
;#use_CFAR_algorithm: If enabled, acquisition estimates the input signal power to implement CFAR detection algorithms
;#notice that this affects the Acquisition threshold range!
Acquisition_1C.use_CFAR_algorithm=false;
;#threshold: Acquisition threshold
Acquisition_1C.threshold=10
;Acquisition_1C.pfa=0.01
Acquisition_1C.doppler_max=5000
Acquisition_1C.doppler_step=100
;######### TRACKING GPS CONFIG ############
Tracking_1C.implementation=GPS_L1_CA_KF_Tracking
Tracking_1C.item_type=gr_complex
Tracking_1C.if=0
Tracking_1C.dump=true
Tracking_1C.dump_filename=../data/epl_tracking_ch_
Tracking_1C.pll_bw_hz=15.0;
Tracking_1C.dll_bw_hz=2.0;
Tracking_1C.order=3;
;######### TELEMETRY DECODER GPS CONFIG ############
TelemetryDecoder_1C.implementation=GPS_L1_CA_Telemetry_Decoder
TelemetryDecoder_1C.dump=false
TelemetryDecoder_1C.decimation_factor=1;
;######### OBSERVABLES CONFIG ############
;#implementation:
Observables.implementation=Hybrid_Observables
;#dump: Enable or disable the Observables internal binary data file logging [true] or [false]
Observables.dump=false
;#dump_filename: Log path and filename.
Observables.dump_filename=./observables.dat
;######### PVT CONFIG ############
PVT.implementation=RTKLIB_PVT
PVT.positioning_mode=PPP_Static ; options: Single, Static, Kinematic, PPP_Static, PPP_Kinematic
PVT.iono_model=Broadcast ; options: OFF, Broadcast, SBAS, Iono-Free-LC, Estimate_STEC, IONEX
PVT.trop_model=Saastamoinen ; options: OFF, Saastamoinen, SBAS, Estimate_ZTD, Estimate_ZTD_Grad
PVT.output_rate_ms=100
PVT.display_rate_ms=500
PVT.dump_filename=./PVT
PVT.nmea_dump_filename=./gnss_sdr_pvt.nmea;
PVT.flag_nmea_tty_port=false;
PVT.nmea_dump_devname=/dev/pts/4
PVT.flag_rtcm_server=false
PVT.flag_rtcm_tty_port=false
PVT.rtcm_dump_devname=/dev/pts/1
PVT.dump=true

1
src/algorithms/tracking/adapters/CMakeLists.txt
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@ -36,6 +36,7 @@ set(TRACKING_ADAPTER_SOURCES
glonass_l1_ca_dll_pll_tracking.cc
glonass_l1_ca_dll_pll_c_aid_tracking.cc
gps_l5i_dll_pll_tracking.cc
gps_l1_ca_kf_tracking.cc
${OPT_TRACKING_ADAPTERS}
)

150
src/algorithms/tracking/adapters/gps_l1_ca_kf_tracking.cc Normal file
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/*!
* \file gps_l1_ca_kf_tracking.cc
* \brief Implementation of an adapter of a DLL+PLL tracking loop block
* for GPS L1 C/A to a TrackingInterface
* \author Carlos Aviles, 2010. carlos.avilesr(at)googlemail.com
* Javier Arribas, 2011. jarribas(at)cttc.es
*
* Code DLL + carrier PLL according to the algorithms described in:
* K.Borre, D.M.Akos, N.Bertelsen, P.Rinder, and S.H.Jensen,
* A Software-Defined GPS and Galileo Receiver. A Single-Frequency
* Approach, Birkhauser, 2007
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2015 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* GNSS-SDR is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GNSS-SDR is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#include "gps_l1_ca_kf_tracking.h"
#include <glog/logging.h>
#include "GPS_L1_CA.h"
#include "configuration_interface.h"
using google::LogMessage;
GpsL1CaKfTracking::GpsL1CaKfTracking(
ConfigurationInterface* configuration, std::string role,
unsigned int in_streams, unsigned int out_streams) :
role_(role), in_streams_(in_streams), out_streams_(out_streams)
{
DLOG(INFO) << "role " << role;
//################# CONFIGURATION PARAMETERS ########################
int fs_in;
int vector_length;
int f_if;
bool dump;
std::string dump_filename;
std::string item_type;
std::string default_item_type = "gr_complex";
float pll_bw_hz;
float dll_bw_hz;
float early_late_space_chips;
item_type = configuration->property(role + ".item_type", default_item_type);
int fs_in_deprecated = configuration->property("GNSS-SDR.internal_fs_hz", 2048000);
fs_in = configuration->property("GNSS-SDR.internal_fs_sps", fs_in_deprecated);
f_if = configuration->property(role + ".if", 0);
dump = configuration->property(role + ".dump", false);
pll_bw_hz = configuration->property(role + ".pll_bw_hz", 50.0);
dll_bw_hz = configuration->property(role + ".dll_bw_hz", 2.0);
early_late_space_chips = configuration->property(role + ".early_late_space_chips", 0.5);
std::string default_dump_filename = "./track_ch";
dump_filename = configuration->property(role + ".dump_filename", default_dump_filename); //unused!
vector_length = std::round(fs_in / (GPS_L1_CA_CODE_RATE_HZ / GPS_L1_CA_CODE_LENGTH_CHIPS));
//################# MAKE TRACKING GNURadio object ###################
if (item_type.compare("gr_complex") == 0)
{
item_size_ = sizeof(gr_complex);
tracking_ = gps_l1_ca_kf_make_tracking_cc(
f_if,
fs_in,
vector_length,
dump,
dump_filename,
pll_bw_hz,
dll_bw_hz,
early_late_space_chips);
}
else
{
item_size_ = sizeof(gr_complex);
LOG(WARNING) << item_type << " unknown tracking item type.";
}
channel_ = 0;
DLOG(INFO) << "tracking(" << tracking_->unique_id() << ")";
}
GpsL1CaKfTracking::~GpsL1CaKfTracking()
{}
void GpsL1CaKfTracking::start_tracking()
{
tracking_->start_tracking();
}
/*
* Set tracking channel unique ID
*/
void GpsL1CaKfTracking::set_channel(unsigned int channel)
{
channel_ = channel;
tracking_->set_channel(channel);
}
void GpsL1CaKfTracking::set_gnss_synchro(Gnss_Synchro* p_gnss_synchro)
{
tracking_->set_gnss_synchro(p_gnss_synchro);
}
void GpsL1CaKfTracking::connect(gr::top_block_sptr top_block)
{
if(top_block) { /* top_block is not null */};
//nothing to connect, now the tracking uses gr_sync_decimator
}
void GpsL1CaKfTracking::disconnect(gr::top_block_sptr top_block)
{
if(top_block) { /* top_block is not null */};
//nothing to disconnect, now the tracking uses gr_sync_decimator
}
gr::basic_block_sptr GpsL1CaKfTracking::get_left_block()
{
return tracking_;
}
gr::basic_block_sptr GpsL1CaKfTracking::get_right_block()
{
return tracking_;
}

104
src/algorithms/tracking/adapters/gps_l1_ca_kf_tracking.h Normal file
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@ -0,0 +1,104 @@
/*!
* \file GPS_L1_CA_KF_Tracking.h
* \brief Interface of an adapter of a DLL+PLL tracking loop block
* for GPS L1 C/A to a TrackingInterface
* \author Carlos Aviles, 2010. carlos.avilesr(at)googlemail.com
* Javier Arribas, 2011. jarribas(at)cttc.es
*
* Code DLL + carrier PLL according to the algorithms described in:
* K.Borre, D.M.Akos, N.Bertelsen, P.Rinder, and S.H.Jensen,
* A Software-Defined GPS and Galileo Receiver. A Single-Frequency
* Approach, Birkhauser, 2007
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2015 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* GNSS-SDR is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GNSS-SDR is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#ifndef GNSS_SDR_GPS_L1_CA_KF_TRACKING_H_
#define GNSS_SDR_GPS_L1_CA_KF_TRACKING_H_
#include <string>
#include "tracking_interface.h"
#include "gps_l1_ca_kf_tracking_cc.h"
class ConfigurationInterface;
/*!
* \brief This class implements a code DLL + carrier PLL tracking loop
*/
class GpsL1CaKfTracking : public TrackingInterface
{
public:
GpsL1CaKfTracking(ConfigurationInterface* configuration,
std::string role,
unsigned int in_streams,
unsigned int out_streams);
virtual ~GpsL1CaKfTracking();
inline std::string role() override
{
return role_;
}
//! Returns "GPS_L1_CA_KF_Tracking"
inline std::string implementation() override
{
return "GPS_L1_CA_KF_Tracking";
}
inline size_t item_size() override
{
return item_size_;
}
void connect(gr::top_block_sptr top_block) override;
void disconnect(gr::top_block_sptr top_block) override;
gr::basic_block_sptr get_left_block() override;
gr::basic_block_sptr get_right_block() override;
/*!
* \brief Set tracking channel unique ID
*/
void set_channel(unsigned int channel) override;
/*!
* \brief Set acquisition/tracking common Gnss_Synchro object pointer
* to efficiently exchange synchronization data between acquisition and tracking blocks
*/
void set_gnss_synchro(Gnss_Synchro* p_gnss_synchro) override;
void start_tracking() override;
private:
gps_l1_ca_kf_tracking_cc_sptr tracking_;
size_t item_size_;
unsigned int channel_;
std::string role_;
unsigned int in_streams_;
unsigned int out_streams_;
};
#endif // GNSS_SDR_GPS_L1_CA_KF_TRACKING_H_

1
src/algorithms/tracking/gnuradio_blocks/CMakeLists.txt
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@ -39,6 +39,7 @@ set(TRACKING_GR_BLOCKS_SOURCES
glonass_l1_ca_dll_pll_tracking_cc.cc
glonass_l1_ca_dll_pll_c_aid_tracking_cc.cc
glonass_l1_ca_dll_pll_c_aid_tracking_sc.cc
gps_l1_ca_kf_tracking_cc.cc
${OPT_TRACKING_BLOCKS}
)

619
src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_kf_tracking_cc.cc Normal file
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@ -0,0 +1,619 @@
/*!
* \file gps_l1_ca_kf_tracking_cc.cc
* \brief Implementation of a code DLL + carrier PLL tracking block
* \author Carlos Aviles, 2010. carlos.avilesr(at)googlemail.com
* Javier Arribas, 2011. jarribas(at)cttc.es
*
* Code DLL + carrier PLL according to the algorithms described in:
* [1] K.Borre, D.M.Akos, N.Bertelsen, P.Rinder, and S.H.Jensen,
* A Software-Defined GPS and Galileo Receiver. A Single-Frequency
* Approach, Birkhauser, 2007
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2015 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* GNSS-SDR is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GNSS-SDR is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#include "gps_l1_ca_kf_tracking_cc.h"
#include <cmath>
#include <iostream>
#include <memory>
#include <sstream>
#include <boost/lexical_cast.hpp>
#include <gnuradio/io_signature.h>
#include <glog/logging.h>
#include <volk_gnsssdr/volk_gnsssdr.h>
#include "gps_sdr_signal_processing.h"
#include "tracking_discriminators.h"
#include "lock_detectors.h"
#include "GPS_L1_CA.h"
#include "control_message_factory.h"
/*!
* \todo Include in definition header file
*/
#define CN0_ESTIMATION_SAMPLES 20
#define MINIMUM_VALID_CN0 25
#define MAXIMUM_LOCK_FAIL_COUNTER 5000
#define CARRIER_LOCK_THRESHOLD 0.85
using google::LogMessage;
gps_l1_ca_kf_tracking_cc_sptr
gps_l1_ca_kf_make_tracking_cc(
long if_freq,
long fs_in,
unsigned int vector_length,
bool dump,
std::string dump_filename,
float pll_bw_hz,
float dll_bw_hz,
float early_late_space_chips)
{
return gps_l1_ca_kf_tracking_cc_sptr(new Gps_L1_Ca_Kf_Tracking_cc(if_freq,
fs_in, vector_length, dump, dump_filename, pll_bw_hz, dll_bw_hz, early_late_space_chips));
}
void Gps_L1_Ca_Kf_Tracking_cc::forecast (int noutput_items,
gr_vector_int &ninput_items_required)
{
if (noutput_items != 0)
{
ninput_items_required[0] = static_cast<int>(d_vector_length) * 2; //set the required available samples in each call
}
}
Gps_L1_Ca_Kf_Tracking_cc::Gps_L1_Ca_Kf_Tracking_cc(
long if_freq,
long fs_in,
unsigned int vector_length,
bool dump,
std::string dump_filename,
float pll_bw_hz,
float dll_bw_hz,
float early_late_space_chips) :
gr::block("Gps_L1_Ca_Kf_Tracking_cc", gr::io_signature::make(1, 1, sizeof(gr_complex)),
gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)))
{
// Telemetry bit synchronization message port input
this->message_port_register_in(pmt::mp("preamble_timestamp_s"));
this->message_port_register_out(pmt::mp("events"));
// initialize internal vars
d_dump = dump;
d_if_freq = if_freq;
d_fs_in = fs_in;
d_vector_length = vector_length;
d_dump_filename = dump_filename;
d_current_prn_length_samples = static_cast<int>(d_vector_length);
// Initialize tracking ==========================================
d_code_loop_filter.set_DLL_BW(dll_bw_hz);
d_carrier_loop_filter.set_PLL_BW(pll_bw_hz);
//--- DLL variables --------------------------------------------------------
d_early_late_spc_chips = early_late_space_chips; // Define early-late offset (in chips)
// Initialization of local code replica
// Get space for a vector with the C/A code replica sampled 1x/chip
d_ca_code = static_cast<float*>(volk_gnsssdr_malloc(static_cast<int>(GPS_L1_CA_CODE_LENGTH_CHIPS) * sizeof(float), volk_gnsssdr_get_alignment()));
// correlator outputs (scalar)
d_n_correlator_taps = 3; // Early, Prompt, and Late
d_correlator_outs = static_cast<gr_complex*>(volk_gnsssdr_malloc(d_n_correlator_taps * sizeof(gr_complex), volk_gnsssdr_get_alignment()));
for (int n = 0; n < d_n_correlator_taps; n++)
{
d_correlator_outs[n] = gr_complex(0,0);
}
d_local_code_shift_chips = static_cast<float*>(volk_gnsssdr_malloc(d_n_correlator_taps * sizeof(float), volk_gnsssdr_get_alignment()));
// Set TAPs delay values [chips]
d_local_code_shift_chips[0] = - d_early_late_spc_chips;
d_local_code_shift_chips[1] = 0.0;
d_local_code_shift_chips[2] = d_early_late_spc_chips;
multicorrelator_cpu.init(2 * d_current_prn_length_samples, d_n_correlator_taps);
//--- Perform initializations ------------------------------
// define initial code frequency basis of NCO
d_code_freq_chips = GPS_L1_CA_CODE_RATE_HZ;
// define residual code phase (in chips)
d_rem_code_phase_samples = 0.0;
// define residual carrier phase
d_rem_carr_phase_rad = 0.0;
// sample synchronization
d_sample_counter = 0;
//d_sample_counter_seconds = 0;
d_acq_sample_stamp = 0;
d_enable_tracking = false;
d_pull_in = false;
// CN0 estimation and lock detector buffers
d_cn0_estimation_counter = 0;
d_Prompt_buffer = new gr_complex[CN0_ESTIMATION_SAMPLES];
d_carrier_lock_test = 1;
d_CN0_SNV_dB_Hz = 0;
d_carrier_lock_fail_counter = 0;
d_carrier_lock_threshold = CARRIER_LOCK_THRESHOLD;
systemName["G"] = std::string("GPS");
systemName["S"] = std::string("SBAS");
d_acquisition_gnss_synchro = 0;
d_channel = 0;
d_acq_code_phase_samples = 0.0;
d_acq_carrier_doppler_hz = 0.0;
d_carrier_doppler_hz = 0.0;
d_acc_carrier_phase_rad = 0.0;
d_code_phase_samples = 0.0;
d_rem_code_phase_chips = 0.0;
d_code_phase_step_chips = 0.0;
d_carrier_phase_step_rad = 0.0;
set_relative_rate(1.0 / static_cast<double>(d_vector_length));
// Kalman filter initialization (receiver initialization)
double CN_dB_Hz=40;
double CN_lin=pow(10,CN_dB_Hz/10.0);
double sigma2_phase_detector_cycles2;
sigma2_phase_detector_cycles2=(1.0/(2.0*CN_lin*GPS_L1_CA_CODE_PERIOD))*(1.0+1.0/(2.0*CN_lin*GPS_L1_CA_CODE_PERIOD));
//covariances (static)
double sigma2_carrier_phase=GPS_TWO_PI/4.0;
double sigma2_doppler=250;
kf_P_x_ini=arma::zeros(2,2);
kf_P_x_ini(0,0)=sigma2_carrier_phase;
kf_P_x_ini(1,1)=sigma2_doppler;
kf_R=arma::zeros(1,1);
kf_R(0,0)=sigma2_phase_detector_cycles2;
//arma::colvec G={pow(GPS_L1_CA_CODE_PERIOD,3)/6.0, pow(GPS_L1_CA_CODE_PERIOD,2)/2.0,GPS_L1_CA_CODE_PERIOD};
kf_Q=arma::zeros(2,2);
kf_Q(0,0)=1e-14;
kf_Q(1,1)=1e-2;
// kf_Q=arma::diagmat(pow(GPS_L1_CA_CODE_PERIOD,6)*kf_Q);
//std::cout<<"kf_Q="<<kf_Q<<std::endl;
kf_F=arma::zeros(2,2);
kf_F(0,0)=1.0;
kf_F(0,1)=GPS_TWO_PI*GPS_L1_CA_CODE_PERIOD;
kf_F(1,0)=0.0;
kf_F(1,1)=1.0;
kf_H=arma::zeros(1,2);
kf_H(0,0)=1.0;
kf_x=arma::zeros(2,1);
kf_y=arma::zeros(1,1);
}
void Gps_L1_Ca_Kf_Tracking_cc::start_tracking()
{
/*
* 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;
d_acq_sample_stamp = d_acquisition_gnss_synchro->Acq_samplestamp_samples;
long int acq_trk_diff_samples;
double acq_trk_diff_seconds;
acq_trk_diff_samples = static_cast<long int>(d_sample_counter) - static_cast<long int>(d_acq_sample_stamp); //-d_vector_length;
DLOG(INFO) << "Number of samples between Acquisition and Tracking = " << acq_trk_diff_samples;
acq_trk_diff_seconds = static_cast<float>(acq_trk_diff_samples) / static_cast<float>(d_fs_in);
// Doppler effect
// Fd=(C/(C+Vr))*F
double radial_velocity = (GPS_L1_FREQ_HZ + d_acq_carrier_doppler_hz) / GPS_L1_FREQ_HZ;
// new chip and prn sequence periods based on acq Doppler
double T_chip_mod_seconds;
double T_prn_mod_seconds;
double T_prn_mod_samples;
d_code_freq_chips = radial_velocity * GPS_L1_CA_CODE_RATE_HZ;
d_code_phase_step_chips = static_cast<double>(d_code_freq_chips) / static_cast<double>(d_fs_in);
T_chip_mod_seconds = 1/d_code_freq_chips;
T_prn_mod_seconds = T_chip_mod_seconds * GPS_L1_CA_CODE_LENGTH_CHIPS;
T_prn_mod_samples = T_prn_mod_seconds * static_cast<double>(d_fs_in);
d_current_prn_length_samples = round(T_prn_mod_samples);
double T_prn_true_seconds = GPS_L1_CA_CODE_LENGTH_CHIPS / GPS_L1_CA_CODE_RATE_HZ;
double T_prn_true_samples = T_prn_true_seconds * static_cast<double>(d_fs_in);
double T_prn_diff_seconds = T_prn_true_seconds - T_prn_mod_seconds;
double N_prn_diff = acq_trk_diff_seconds / T_prn_true_seconds;
double corrected_acq_phase_samples, delay_correction_samples;
corrected_acq_phase_samples = fmod((d_acq_code_phase_samples + T_prn_diff_seconds * N_prn_diff * static_cast<double>(d_fs_in)), T_prn_true_samples);
if (corrected_acq_phase_samples < 0)
{
corrected_acq_phase_samples = T_prn_mod_samples + corrected_acq_phase_samples;
}
delay_correction_samples = d_acq_code_phase_samples - corrected_acq_phase_samples;
d_acq_code_phase_samples = corrected_acq_phase_samples;
d_carrier_doppler_hz = d_acq_carrier_doppler_hz;
d_carrier_phase_step_rad = GPS_TWO_PI * d_carrier_doppler_hz / static_cast<double>(d_fs_in);
// DLL/PLL filter initialization
d_carrier_loop_filter.initialize(); // initialize the carrier filter
d_code_loop_filter.initialize(); // initialize the code filter
// generate local reference ALWAYS starting at chip 1 (1 sample per chip)
gps_l1_ca_code_gen_float(d_ca_code, d_acquisition_gnss_synchro->PRN, 0);
multicorrelator_cpu.set_local_code_and_taps(static_cast<int>(GPS_L1_CA_CODE_LENGTH_CHIPS), d_ca_code, d_local_code_shift_chips);
for (int n = 0; n < d_n_correlator_taps; n++)
{
d_correlator_outs[n] = gr_complex(0,0);
}
d_carrier_lock_fail_counter = 0;
d_rem_code_phase_samples = 0;
d_rem_carr_phase_rad = 0.0;
d_rem_code_phase_chips = 0.0;
d_acc_carrier_phase_rad = 0.0;
d_code_phase_samples = d_acq_code_phase_samples;
std::string sys_ = &d_acquisition_gnss_synchro->System;
sys = sys_.substr(0,1);
// DEBUG OUTPUT
std::cout << "Tracking of GPS L1 C/A signal started on channel " << d_channel << " for satellite " << Gnss_Satellite(systemName[sys], d_acquisition_gnss_synchro->PRN) << std::endl;
LOG(INFO) << "Starting tracking of satellite " << Gnss_Satellite(systemName[sys], d_acquisition_gnss_synchro->PRN) << " on channel " << d_channel;
// enable tracking
d_pull_in = true;
d_enable_tracking = true;
LOG(INFO) << "PULL-IN Doppler [Hz]=" << d_carrier_doppler_hz
<< " Code Phase correction [samples]=" << delay_correction_samples
<< " PULL-IN Code Phase [samples]=" << d_acq_code_phase_samples;
}
Gps_L1_Ca_Kf_Tracking_cc::~Gps_L1_Ca_Kf_Tracking_cc()
{
if (d_dump_file.is_open())
{
try
{
d_dump_file.close();
}
catch(const std::exception & ex)
{
LOG(WARNING) << "Exception in destructor " << ex.what();
}
}
try
{
volk_gnsssdr_free(d_local_code_shift_chips);
volk_gnsssdr_free(d_correlator_outs);
volk_gnsssdr_free(d_ca_code);
delete[] d_Prompt_buffer;
multicorrelator_cpu.free();
}
catch(const std::exception & ex)
{
LOG(WARNING) << "Exception in destructor " << ex.what();
}
}
int Gps_L1_Ca_Kf_Tracking_cc::general_work (int noutput_items __attribute__((unused)), gr_vector_int &ninput_items __attribute__((unused)),
gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
{
// process vars
double carr_phase_error_rad = 0.0;
double carr_phase_error_filt_rad = 0.0;
double code_error_chips = 0.0;
double code_error_filt_chips = 0.0;
// Block input data and block output stream pointers
const gr_complex* in = reinterpret_cast<const gr_complex *>(input_items[0]);
Gnss_Synchro **out = reinterpret_cast<Gnss_Synchro **>(&output_items[0]);
// GNSS_SYNCHRO OBJECT to interchange data between tracking->telemetry_decoder
Gnss_Synchro current_synchro_data = Gnss_Synchro();
if (d_enable_tracking == true)
{
// Fill the acquisition data
current_synchro_data = *d_acquisition_gnss_synchro;
// Receiver signal alignment
if (d_pull_in == true)
{
int samples_offset;
double acq_trk_shif_correction_samples;
int acq_to_trk_delay_samples;
acq_to_trk_delay_samples = d_sample_counter - d_acq_sample_stamp;
acq_trk_shif_correction_samples = d_current_prn_length_samples - fmod(static_cast<float>(acq_to_trk_delay_samples), static_cast<float>(d_current_prn_length_samples));
samples_offset = round(d_acq_code_phase_samples + acq_trk_shif_correction_samples);
current_synchro_data.Tracking_sample_counter = d_sample_counter + samples_offset;
d_sample_counter = d_sample_counter + samples_offset; // count for the processed samples
d_pull_in = false;
// take into account the carrier cycles accumulated in the pull in signal alignment
d_acc_carrier_phase_rad -= d_carrier_phase_step_rad * samples_offset;
current_synchro_data.Carrier_phase_rads = d_acc_carrier_phase_rad;
current_synchro_data.Carrier_Doppler_hz = d_carrier_doppler_hz;
current_synchro_data.fs = d_fs_in;
current_synchro_data.correlation_length_ms = 1;
*out[0] = current_synchro_data;
//Kalman filter initialization reset
kf_P_x=kf_P_x_ini;
//Update Kalman states based on acquisition information
kf_x(0)=0.0;
kf_x(1)=current_synchro_data.Carrier_Doppler_hz;
consume_each(samples_offset); // shift input to perform alignment with local replica
return 1;
}
// ################# CARRIER WIPEOFF AND CORRELATORS ##############################
// perform carrier wipe-off and compute Early, Prompt and Late correlation
multicorrelator_cpu.set_input_output_vectors(d_correlator_outs, in);
multicorrelator_cpu.Carrier_wipeoff_multicorrelator_resampler(d_rem_carr_phase_rad,
d_carrier_phase_step_rad,
d_rem_code_phase_chips,
d_code_phase_step_chips,
d_current_prn_length_samples);
// remnant carrier phase to prevent overflow in the code NCO
//d_rem_carr_phase_rad = d_rem_carr_phase_rad + d_carrier_phase_step_rad * d_current_prn_length_samples;
//d_rem_carr_phase_rad = fmod(d_rem_carr_phase_rad, GPS_TWO_PI);
// ################## Kalman Carrier Tracking ######################################
//Kalman state prediction (time update)
kf_x_pre=kf_F*kf_x; //state prediction
kf_P_x_pre=kf_F*kf_P_x*kf_F.t()+kf_Q; //state error covariance prediction
// Update discriminator [rads/Ti]
carr_phase_error_rad = pll_cloop_two_quadrant_atan(d_correlator_outs[1]); // prompt output
//Kalman estimation (measuremant update)
//kf_y_pre=kf_H*kf_x_pre; //measurement prediction
kf_P_y=kf_H*kf_P_x_pre*kf_H.t()+kf_R; //innovation covariance matrix
kf_K=(kf_P_x_pre*kf_H.t())*arma::inv(kf_P_y); //Kalman gain
kf_y(0)=carr_phase_error_rad; //measurement vector
//kf_x=kf_x_pre+kf_K*(kf_y-kf_y_pre); //updated state estimation
kf_x=kf_x_pre+kf_K*kf_y; //updated state estimation
kf_x(0)=fmod(arma::as_scalar(kf_x(0)), GPS_TWO_PI);
//kf_P_x=kf_P_x_pre-kf_K*kf_H*kf_P_x_pre; //update state estimation error covariance matrix
kf_P_x=(arma::eye(2,2)-kf_K*kf_H)*kf_P_x_pre; //update state estimation error covariance matrix
d_rem_carr_phase_rad=kf_x(0); //set a new carrier Phase estimation to the NCO
d_carrier_doppler_hz=kf_x(1); //set a new carrier Doppler estimation to the NCO
carr_phase_error_filt_rad=d_rem_carr_phase_rad;
// ################## DLL ##########################################################
// New code Doppler frequency estimation based on carrier frequency estimation
d_code_freq_chips = GPS_L1_CA_CODE_RATE_HZ + ((d_carrier_doppler_hz * GPS_L1_CA_CODE_RATE_HZ) / GPS_L1_FREQ_HZ);
// DLL discriminator
code_error_chips = dll_nc_e_minus_l_normalized(d_correlator_outs[0], d_correlator_outs[2]); // [chips/Ti] //early and late
// Code discriminator filter
code_error_filt_chips = d_code_loop_filter.get_code_nco(code_error_chips); // [chips/second]
double T_chip_seconds = 1.0 / static_cast<double>(d_code_freq_chips);
double T_prn_seconds = T_chip_seconds * GPS_L1_CA_CODE_LENGTH_CHIPS;
double code_error_filt_secs = (T_prn_seconds * code_error_filt_chips*T_chip_seconds); //[seconds]
//double code_error_filt_secs = (GPS_L1_CA_CODE_PERIOD * code_error_filt_chips) / GPS_L1_CA_CODE_RATE_HZ; // [seconds]
// ################## CARRIER AND CODE NCO BUFFER ALIGNEMENT #######################
// keep alignment parameters for the next input buffer
// Compute the next buffer length based in the new period of the PRN sequence and the code phase error estimation
//double T_chip_seconds = 1.0 / static_cast<double>(d_code_freq_chips);
//double T_prn_seconds = T_chip_seconds * GPS_L1_CA_CODE_LENGTH_CHIPS;
double T_prn_samples = T_prn_seconds * static_cast<double>(d_fs_in);
double K_blk_samples = T_prn_samples + d_rem_code_phase_samples + code_error_filt_secs * static_cast<double>(d_fs_in);
d_current_prn_length_samples = round(K_blk_samples); // round to a discrete number of samples
//################### NCO COMMANDS #################################################
// carrier phase step (NCO phase increment per sample) [rads/sample]
d_carrier_phase_step_rad = GPS_TWO_PI * d_carrier_doppler_hz / static_cast<double>(d_fs_in);
// carrier phase accumulator
d_acc_carrier_phase_rad -= d_carrier_phase_step_rad * d_current_prn_length_samples;
//################### DLL COMMANDS #################################################
// code phase step (Code resampler phase increment per sample) [chips/sample]
d_code_phase_step_chips = d_code_freq_chips / static_cast<double>(d_fs_in);
// remnant code phase [chips]
d_rem_code_phase_samples = K_blk_samples - d_current_prn_length_samples; // rounding error < 1 sample
d_rem_code_phase_chips = d_code_freq_chips * (d_rem_code_phase_samples / static_cast<double>(d_fs_in));
// ####### CN0 ESTIMATION AND LOCK DETECTORS ######
if (d_cn0_estimation_counter < CN0_ESTIMATION_SAMPLES)
{
// fill buffer with prompt correlator output values
d_Prompt_buffer[d_cn0_estimation_counter] = d_correlator_outs[1]; //prompt
d_cn0_estimation_counter++;
}
else
{
d_cn0_estimation_counter = 0;
// Code lock indicator
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES, d_fs_in, GPS_L1_CA_CODE_LENGTH_CHIPS);
//std::cout<<"Channel "<<d_channel<<" CN0: " <<d_CN0_SNV_dB_Hz<<"[dB_Hz]\n";
// Carrier lock indicator
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES);
// Loss of lock detection
if (d_carrier_lock_test < d_carrier_lock_threshold or d_CN0_SNV_dB_Hz < MINIMUM_VALID_CN0)
{
d_carrier_lock_fail_counter++;
}
else
{
if (d_carrier_lock_fail_counter > 0) d_carrier_lock_fail_counter--;
}
if (d_carrier_lock_fail_counter > MAXIMUM_LOCK_FAIL_COUNTER)
{
std::cout << "Loss of lock in channel " << d_channel << "!" << std::endl;
LOG(INFO) << "Loss of lock in channel " << d_channel << "!";
this->message_port_pub(pmt::mp("events"), pmt::from_long(3)); // 3 -> loss of lock
d_carrier_lock_fail_counter = 0;
d_enable_tracking = false; // TODO: check if disabling tracking is consistent with the channel state machine
}
}
// ########### Output the tracking data to navigation and PVT ##########
current_synchro_data.Prompt_I = static_cast<double>((d_correlator_outs[1]).real());
current_synchro_data.Prompt_Q = static_cast<double>((d_correlator_outs[1]).imag());
current_synchro_data.Tracking_sample_counter = d_sample_counter + d_current_prn_length_samples;
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;
current_synchro_data.CN0_dB_hz = d_CN0_SNV_dB_Hz;
current_synchro_data.Flag_valid_symbol_output = true;
current_synchro_data.correlation_length_ms = 1;
}
else
{
for (int n = 0; n < d_n_correlator_taps; n++)
{
d_correlator_outs[n] = gr_complex(0,0);
}
current_synchro_data.Tracking_sample_counter =d_sample_counter + d_current_prn_length_samples;
current_synchro_data.System = {'G'};
current_synchro_data.correlation_length_ms = 1;
}
//assign the GNURadio block output data
current_synchro_data.fs = d_fs_in;
*out[0] = current_synchro_data;
if(d_dump)
{
// MULTIPLEXED FILE RECORDING - Record results to file
float prompt_I;
float prompt_Q;
float tmp_E, tmp_P, tmp_L;
double tmp_double;
unsigned long int tmp_long;
prompt_I = d_correlator_outs[1].real();
prompt_Q = d_correlator_outs[1].imag();
tmp_E = std::abs<float>(d_correlator_outs[0]);
tmp_P = std::abs<float>(d_correlator_outs[1]);
tmp_L = std::abs<float>(d_correlator_outs[2]);
try
{
// EPR
d_dump_file.write(reinterpret_cast<char*>(&tmp_E), sizeof(float));
d_dump_file.write(reinterpret_cast<char*>(&tmp_P), sizeof(float));
d_dump_file.write(reinterpret_cast<char*>(&tmp_L), sizeof(float));
// PROMPT I and Q (to analyze navigation symbols)
d_dump_file.write(reinterpret_cast<char*>(&prompt_I), sizeof(float));
d_dump_file.write(reinterpret_cast<char*>(&prompt_Q), sizeof(float));
// PRN start sample stamp
tmp_long = d_sample_counter + d_current_prn_length_samples;
d_dump_file.write(reinterpret_cast<char*>(&tmp_long), sizeof(unsigned long int));
// accumulated carrier phase
d_dump_file.write(reinterpret_cast<char*>(&d_acc_carrier_phase_rad), sizeof(double));
// carrier and code frequency
d_dump_file.write(reinterpret_cast<char*>(&d_carrier_doppler_hz), sizeof(double));
d_dump_file.write(reinterpret_cast<char*>(&d_code_freq_chips), sizeof(double));
// PLL commands
d_dump_file.write(reinterpret_cast<char*>(&carr_phase_error_rad), sizeof(double));
d_dump_file.write(reinterpret_cast<char*>(&carr_phase_error_filt_rad), sizeof(double));
// DLL commands
d_dump_file.write(reinterpret_cast<char*>(&code_error_chips), sizeof(double));
d_dump_file.write(reinterpret_cast<char*>(&code_error_filt_chips), sizeof(double));
// CN0 and carrier lock test
d_dump_file.write(reinterpret_cast<char*>(&d_CN0_SNV_dB_Hz), sizeof(double));
d_dump_file.write(reinterpret_cast<char*>(&d_carrier_lock_test), sizeof(double));
// AUX vars (for debug purposes)
tmp_double = d_rem_code_phase_samples;
d_dump_file.write(reinterpret_cast<char*>(&tmp_double), sizeof(double));
tmp_double = static_cast<double>(d_sample_counter);
d_dump_file.write(reinterpret_cast<char*>(&tmp_double), sizeof(double));
// PRN
unsigned int prn_ = d_acquisition_gnss_synchro->PRN;
d_dump_file.write(reinterpret_cast<char*>(&prn_), sizeof(unsigned int));
}
catch (const std::ifstream::failure &e)
{
LOG(WARNING) << "Exception writing trk dump file " << e.what();
}
}
consume_each(d_current_prn_length_samples); // this is necessary in gr::block derivates
d_sample_counter += d_current_prn_length_samples; // count for the processed samples
return 1; // output tracking result ALWAYS even in the case of d_enable_tracking==false
}
void Gps_L1_Ca_Kf_Tracking_cc::set_channel(unsigned int channel)
{
d_channel = channel;
LOG(INFO) << "Tracking Channel set to " << d_channel;
// ############# ENABLE DATA FILE LOG #################
if (d_dump == true)
{
if (d_dump_file.is_open() == false)
{
try
{
d_dump_filename.append(boost::lexical_cast<std::string>(d_channel));
d_dump_filename.append(".dat");
d_dump_file.exceptions (std::ifstream::failbit | std::ifstream::badbit);
d_dump_file.open(d_dump_filename.c_str(), std::ios::out | std::ios::binary);
LOG(INFO) << "Tracking dump enabled on channel " << d_channel << " Log file: " << d_dump_filename.c_str();
}
catch (const std::ifstream::failure &e)
{
LOG(WARNING) << "channel " << d_channel << " Exception opening trk dump file " << e.what();
}
}
}
}
void Gps_L1_Ca_Kf_Tracking_cc::set_gnss_synchro(Gnss_Synchro* p_gnss_synchro)
{
d_acquisition_gnss_synchro = p_gnss_synchro;
}

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/*!
* \file gps_l1_ca_dll_pll_tracking_cc.h
* \brief Interface of a code DLL + carrier PLL tracking block
* \author Carlos Aviles, 2010. carlos.avilesr(at)googlemail.com
* Javier Arribas, 2011. jarribas(at)cttc.es
* Cillian O'Driscoll, 2017. cillian.odriscoll(at)gmail.com
*
* Code DLL + carrier PLL according to the algorithms described in:
* K.Borre, D.M.Akos, N.Bertelsen, P.Rinder, and S.H.Jensen,
* A Software-Defined GPS and Galileo Receiver. A Single-Frequency Approach,
* Birkhauser, 2007
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2015 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS-SDR.
*
* GNSS-SDR is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GNSS-SDR is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#ifndef GNSS_SDR_GPS_L1_CA_KF_TRACKING_CC_H
#define GNSS_SDR_GPS_L1_CA_KF_TRACKING_CC_H
#include <fstream>
#include <map>
#include <string>
#include <gnuradio/block.h>
#include "gnss_synchro.h"
#include "tracking_2nd_DLL_filter.h"
#include "tracking_2nd_PLL_filter.h"
#include <armadillo>
#include "cpu_multicorrelator_real_codes.h"
class Gps_L1_Ca_Kf_Tracking_cc;
typedef boost::shared_ptr<Gps_L1_Ca_Kf_Tracking_cc>
gps_l1_ca_kf_tracking_cc_sptr;
gps_l1_ca_kf_tracking_cc_sptr
gps_l1_ca_kf_make_tracking_cc(long if_freq,
long fs_in, unsigned
int vector_length,
bool dump,
std::string dump_filename,
float pll_bw_hz,
float dll_bw_hz,
float early_late_space_chips);
/*!
* \brief This class implements a DLL + PLL tracking loop block
*/
class Gps_L1_Ca_Kf_Tracking_cc: public gr::block
{
public:
~Gps_L1_Ca_Kf_Tracking_cc();
void set_channel(unsigned int channel);
void set_gnss_synchro(Gnss_Synchro* p_gnss_synchro);
void start_tracking();
int general_work (int noutput_items, gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items, gr_vector_void_star &output_items);
void forecast (int noutput_items, gr_vector_int &ninput_items_required);
private:
friend gps_l1_ca_kf_tracking_cc_sptr
gps_l1_ca_kf_make_tracking_cc(long if_freq,
long fs_in, unsigned
int vector_length,
bool dump,
std::string dump_filename,
float pll_bw_hz,
float dll_bw_hz,
float early_late_space_chips);
Gps_L1_Ca_Kf_Tracking_cc(long if_freq,
long fs_in, unsigned
int vector_length,
bool dump,
std::string dump_filename,
float pll_bw_hz,
float dll_bw_hz,
float early_late_space_chips);
// tracking configuration vars
unsigned int d_vector_length;
bool d_dump;
Gnss_Synchro* d_acquisition_gnss_synchro;
unsigned int d_channel;
long d_if_freq;
long d_fs_in;
double d_early_late_spc_chips;
// remaining code phase and carrier phase between tracking loops
double d_rem_code_phase_samples;
double d_rem_code_phase_chips;
double d_rem_carr_phase_rad;
// Kalman filter variables
arma::mat kf_P_x_ini; //initial state error covariance matrix
arma::mat kf_P_x; //state error covariance matrix
arma::mat kf_P_x_pre; //Predicted state error covariance matrix
arma::mat kf_P_y; //innovation covariance matrix
arma::mat kf_F; //state transition matrix
arma::mat kf_H; //system matrix
arma::mat kf_R; //measurement error covariance matrix
arma::mat kf_Q; //system error covariance matrix
arma::colvec kf_x; //state vector
arma::colvec kf_x_pre; //predicted state vector
arma::colvec kf_y; //measurement vector
arma::colvec kf_y_pre; //measurement vector
arma::mat kf_K; //Kalman gain matrix
// PLL and DLL filter library
Tracking_2nd_DLL_filter d_code_loop_filter;
Tracking_2nd_PLL_filter d_carrier_loop_filter;
// acquisition
double d_acq_code_phase_samples;
double d_acq_carrier_doppler_hz;
// correlator
int d_n_correlator_taps;
float* d_ca_code;
float* d_local_code_shift_chips;
gr_complex* d_correlator_outs;
cpu_multicorrelator_real_codes multicorrelator_cpu;
// tracking vars
double d_code_freq_chips;
double d_code_phase_step_chips;
double d_carrier_doppler_hz;
double d_carrier_phase_step_rad;
double d_acc_carrier_phase_rad;
double d_code_phase_samples;
//PRN period in samples
int d_current_prn_length_samples;
//processing samples counters
unsigned long int d_sample_counter;
unsigned long int d_acq_sample_stamp;
// CN0 estimation and lock detector
int d_cn0_estimation_counter;
gr_complex* d_Prompt_buffer;
double d_carrier_lock_test;
double d_CN0_SNV_dB_Hz;
double d_carrier_lock_threshold;
int d_carrier_lock_fail_counter;
// control vars
bool d_enable_tracking;
bool d_pull_in;
// file dump
std::string d_dump_filename;
std::ofstream d_dump_file;
std::map<std::string, std::string> systemName;
std::string sys;
};
#endif //GNSS_SDR_GPS_L1_CA_KF_TRACKING_CC_H

13
src/core/receiver/gnss_block_factory.cc
View File

@ -98,6 +98,7 @@
#include "sbas_l1_telemetry_decoder.h"
#include "hybrid_observables.h"
#include "rtklib_pvt.h"
#include "gps_l1_ca_kf_tracking.h"
#if ENABLE_FPGA
#include "gps_l1_ca_dll_pll_c_aid_tracking_fpga.h"
@ -1290,6 +1291,12 @@ std::unique_ptr<GNSSBlockInterface> GNSSBlockFactory::GetBlock(
out_streams));
block = std::move(block_);
}
else if (implementation.compare("GPS_L1_CA_KF_Tracking") == 0)
{
std::unique_ptr<GNSSBlockInterface> block_(new GpsL1CaKfTracking(configuration.get(), role, in_streams,
out_streams));
block = std::move(block_);
}
else if (implementation.compare("GPS_L1_CA_DLL_PLL_C_Aid_Tracking") == 0)
{
std::unique_ptr<TrackingInterface> block_(new GpsL1CaDllPllCAidTracking(configuration.get(), role, in_streams,
@ -1579,6 +1586,12 @@ std::unique_ptr<TrackingInterface> GNSSBlockFactory::GetTrkBlock(
out_streams));
block = std::move(block_);
}
else if (implementation.compare("GPS_L1_CA_KF_Tracking") == 0)
{
std::unique_ptr<TrackingInterface> block_(new GpsL1CaKfTracking(configuration.get(), role, in_streams,
out_streams));
block = std::move(block_);
}
else if (implementation.compare("GPS_L1_CA_DLL_PLL_C_Aid_Tracking") == 0)
{
std::unique_ptr<TrackingInterface> block_(new GpsL1CaDllPllCAidTracking(configuration.get(), role, in_streams,