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/*!
* \ file glonass_l2_ca_dll_pll_tracking_cc . cc
* \ brief Implementation of a code DLL + carrier PLL tracking block
* \ author Gabriel Araujo , 2017. gabriel . araujo .5000 ( at ) gmail . com
* \ author Luis Esteve , 2017. luis ( at ) epsilon - formacion . com
* \ author Damian Miralles , 2017. dmiralles2009 ( 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 , Birkha user , 2007
*
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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*
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* Copyright ( C ) 2010 - 2020 ( see AUTHORS file for a list of contributors )
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*
* GNSS - SDR is a software defined Global Navigation
* Satellite Systems receiver
*
* This file is part of GNSS - SDR .
*
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* SPDX - License - Identifier : GPL - 3.0 - or - later
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*
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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*/
# include "glonass_l2_ca_dll_pll_tracking_cc.h"
# include "GLONASS_L1_L2_CA.h"
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# include "MATH_CONSTANTS.h"
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# include "glonass_l2_signal_processing.h"
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# include "gnss_satellite.h"
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# include "gnss_sdr_flags.h"
# include "lock_detectors.h"
# include "tracking_discriminators.h"
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# include <glog/logging.h>
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# include <gnuradio/io_signature.h>
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# include <matio.h>
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# include <algorithm>
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# include <array>
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# include <cmath>
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# include <exception>
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# include <iostream>
# include <memory>
# include <sstream>
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# include <utility>
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# include <vector>
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# define CN0_ESTIMATION_SAMPLES 10
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glonass_l2_ca_dll_pll_tracking_cc_sptr glonass_l2_ca_dll_pll_make_tracking_cc (
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int64_t fs_in ,
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uint32_t vector_length ,
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bool dump ,
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const std : : string & dump_filename ,
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float pll_bw_hz ,
float dll_bw_hz ,
float early_late_space_chips )
{
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return glonass_l2_ca_dll_pll_tracking_cc_sptr ( new Glonass_L2_Ca_Dll_Pll_Tracking_cc (
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fs_in , vector_length , dump , dump_filename , pll_bw_hz , dll_bw_hz , early_late_space_chips ) ) ;
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}
void Glonass_L2_Ca_Dll_Pll_Tracking_cc : : forecast ( int noutput_items ,
gr_vector_int & ninput_items_required )
{
if ( noutput_items ! = 0 )
{
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ninput_items_required [ 0 ] = static_cast < int32_t > ( d_vector_length ) * 2 ; // set the required available samples in each call
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}
}
Glonass_L2_Ca_Dll_Pll_Tracking_cc : : Glonass_L2_Ca_Dll_Pll_Tracking_cc (
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int64_t fs_in ,
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uint32_t vector_length ,
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bool dump ,
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const std : : string & dump_filename ,
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float pll_bw_hz ,
float dll_bw_hz ,
float early_late_space_chips ) : gr : : block ( " Glonass_L2_Ca_Dll_Pll_Tracking_cc " , gr : : io_signature : : make ( 1 , 1 , sizeof ( gr_complex ) ) ,
gr : : io_signature : : make ( 1 , 1 , sizeof ( Gnss_Synchro ) ) )
{
this - > message_port_register_out ( pmt : : mp ( " events " ) ) ;
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this - > message_port_register_in ( pmt : : mp ( " telemetry_to_trk " ) ) ;
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// initialize internal vars
d_dump = dump ;
d_fs_in = fs_in ;
d_vector_length = vector_length ;
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d_dump_filename = dump_filename ;
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d_current_prn_length_samples = static_cast < int32_t > ( d_vector_length ) ;
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// Initialize tracking ==========================================
d_code_loop_filter . set_DLL_BW ( dll_bw_hz ) ;
d_carrier_loop_filter . set_PLL_BW ( pll_bw_hz ) ;
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// --- DLL variables -------------------------------------------------------
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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
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d_ca_code . resize ( static_cast < int32_t > ( GLONASS_L2_CA_CODE_LENGTH_CHIPS ) , gr_complex ( 0.0 , 0.0 ) ) ;
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// correlator outputs (scalar)
d_n_correlator_taps = 3 ; // Early, Prompt, and Late
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d_correlator_outs . resize ( d_n_correlator_taps , gr_complex ( 0.0 , 0.0 ) ) ;
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d_local_code_shift_chips . reserve ( d_n_correlator_taps ) ;
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// 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 ) ;
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// --- Perform initializations ------------------------------
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// define initial code frequency basis of NCO
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d_code_freq_chips = GLONASS_L2_CA_CODE_RATE_CPS ;
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// 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
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d_sample_counter = 0ULL ;
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// d_sample_counter_seconds = 0;
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d_acq_sample_stamp = 0 ;
d_enable_tracking = false ;
d_pull_in = false ;
// CN0 estimation and lock detector buffers
d_cn0_estimation_counter = 0 ;
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d_Prompt_buffer . reserve ( FLAGS_cn0_samples ) ;
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d_carrier_lock_test = 1 ;
d_CN0_SNV_dB_Hz = 0 ;
d_carrier_lock_fail_counter = 0 ;
d_carrier_lock_threshold = FLAGS_carrier_lock_th ;
systemName [ " R " ] = std : : string ( " Glonass " ) ;
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d_acquisition_gnss_synchro = nullptr ;
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d_channel = 0 ;
d_acq_code_phase_samples = 0.0 ;
d_acq_carrier_doppler_hz = 0.0 ;
d_carrier_doppler_hz = 0.0 ;
d_carrier_doppler_phase_step_rad = 0.0 ;
d_carrier_frequency_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 ;
d_glonass_freq_ch = 0 ;
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d_acc_carrier_phase_initialized = false ;
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set_relative_rate ( 1.0 / static_cast < double > ( d_vector_length ) ) ;
}
void Glonass_L2_Ca_Dll_Pll_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 ;
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const int64_t acq_trk_diff_samples = static_cast < int64_t > ( d_sample_counter ) - static_cast < int64_t > ( d_acq_sample_stamp ) ; // -d_vector_length;
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DLOG ( INFO ) < < " Number of samples between Acquisition and Tracking = " < < acq_trk_diff_samples ;
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const double acq_trk_diff_seconds = static_cast < float > ( acq_trk_diff_samples ) / static_cast < float > ( d_fs_in ) ;
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// Doppler effect
// Fd=(C/(C+Vr))*F
d_glonass_freq_ch = GLONASS_L2_CA_FREQ_HZ + ( DFRQ2_GLO * GLONASS_PRN . at ( d_acquisition_gnss_synchro - > PRN ) ) ;
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const double radial_velocity = ( d_glonass_freq_ch + d_acq_carrier_doppler_hz ) / d_glonass_freq_ch ;
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// new chip and prn sequence periods based on acq Doppler
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d_code_freq_chips = radial_velocity * GLONASS_L2_CA_CODE_RATE_CPS ;
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d_code_phase_step_chips = static_cast < double > ( d_code_freq_chips ) / static_cast < double > ( d_fs_in ) ;
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const double T_chip_mod_seconds = 1.0 / d_code_freq_chips ;
const double T_prn_mod_seconds = T_chip_mod_seconds * GLONASS_L2_CA_CODE_LENGTH_CHIPS ;
const double T_prn_mod_samples = T_prn_mod_seconds * static_cast < double > ( d_fs_in ) ;
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d_current_prn_length_samples = round ( T_prn_mod_samples ) ;
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const double T_prn_true_seconds = GLONASS_L2_CA_CODE_LENGTH_CHIPS / GLONASS_L2_CA_CODE_RATE_CPS ;
const double T_prn_true_samples = T_prn_true_seconds * static_cast < double > ( d_fs_in ) ;
const double T_prn_diff_seconds = T_prn_true_seconds - T_prn_mod_seconds ;
const double N_prn_diff = acq_trk_diff_seconds / T_prn_true_seconds ;
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double corrected_acq_phase_samples ;
double delay_correction_samples ;
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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 ;
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d_carrier_frequency_hz = d_acq_carrier_doppler_hz + ( DFRQ2_GLO * GLONASS_PRN . at ( d_acquisition_gnss_synchro - > PRN ) ) ;
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d_carrier_doppler_hz = d_acq_carrier_doppler_hz ;
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d_carrier_phase_step_rad = TWO_PI * d_carrier_frequency_hz / static_cast < double > ( d_fs_in ) ;
d_carrier_doppler_phase_step_rad = TWO_PI * ( d_carrier_doppler_hz ) / static_cast < double > ( d_fs_in ) ;
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// 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)
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glonass_l2_ca_code_gen_complex ( own : : span < gr_complex > ( d_ca_code . data ( ) , GLONASS_L2_CA_CODE_LENGTH_CHIPS ) , 0 ) ;
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multicorrelator_cpu . set_local_code_and_taps ( static_cast < int32_t > ( GLONASS_L2_CA_CODE_LENGTH_CHIPS ) , d_ca_code . data ( ) , d_local_code_shift_chips . data ( ) ) ;
std : : fill_n ( d_correlator_outs . begin ( ) , d_n_correlator_taps , gr_complex ( 0.0 , 0.0 ) ) ;
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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 ;
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const std : : string sys_ = & d_acquisition_gnss_synchro - > System ;
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sys = sys_ . substr ( 0 , 1 ) ;
// DEBUG OUTPUT
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std : : cout < < " Tracking of GLONASS L2 C/A signal started on channel " < < d_channel < < " for satellite " < < Gnss_Satellite ( systemName [ sys ] , d_acquisition_gnss_synchro - > PRN ) < < ' \n ' ;
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LOG ( INFO ) < < " Tracking of GLONASS L2 C/A signal for satellite " < < Gnss_Satellite ( systemName [ sys ] , d_acquisition_gnss_synchro - > PRN ) < < " on channel " < < d_channel ;
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// enable tracking
d_pull_in = true ;
d_enable_tracking = true ;
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d_acc_carrier_phase_initialized = false ;
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LOG ( INFO ) < < " PULL-IN Doppler [Hz]= " < < d_carrier_frequency_hz
< < " Code Phase correction [samples]= " < < delay_correction_samples
< < " PULL-IN Code Phase [samples]= " < < d_acq_code_phase_samples ;
}
Glonass_L2_Ca_Dll_Pll_Tracking_cc : : ~ Glonass_L2_Ca_Dll_Pll_Tracking_cc ( )
{
if ( d_dump_file . is_open ( ) )
{
try
{
d_dump_file . close ( ) ;
}
catch ( const std : : exception & ex )
{
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LOG ( WARNING ) < < " Exception in Tracking block destructor: " < < ex . what ( ) ;
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}
}
if ( d_dump )
{
if ( d_channel = = 0 )
{
std : : cout < < " Writing .mat files ... " ;
}
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try
{
Glonass_L2_Ca_Dll_Pll_Tracking_cc : : save_matfile ( ) ;
}
catch ( const std : : exception & ex )
{
LOG ( WARNING ) < < " Error saving the .mat file: " < < ex . what ( ) ;
}
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if ( d_channel = = 0 )
{
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std : : cout < < " done. \n " ;
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}
}
try
{
multicorrelator_cpu . free ( ) ;
}
catch ( const std : : exception & ex )
{
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LOG ( WARNING ) < < " Exception in Tracking block destructor: " < < ex . what ( ) ;
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}
}
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int32_t Glonass_L2_Ca_Dll_Pll_Tracking_cc : : save_matfile ( ) const
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{
// READ DUMP FILE
std : : ifstream : : pos_type size ;
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const int32_t number_of_double_vars = 11 ;
const int32_t number_of_float_vars = 5 ;
const int32_t epoch_size_bytes = sizeof ( uint64_t ) + sizeof ( double ) * number_of_double_vars +
sizeof ( float ) * number_of_float_vars + sizeof ( uint32_t ) ;
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std : : ifstream dump_file ;
dump_file . exceptions ( std : : ifstream : : failbit | std : : ifstream : : badbit ) ;
try
{
dump_file . open ( d_dump_filename . c_str ( ) , std : : ios : : binary | std : : ios : : ate ) ;
}
catch ( const std : : ifstream : : failure & e )
{
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std : : cerr < < " Problem opening dump file: " < < e . what ( ) < < ' \n ' ;
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return 1 ;
}
// count number of epochs and rewind
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int64_t num_epoch = 0 ;
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if ( dump_file . is_open ( ) )
{
size = dump_file . tellg ( ) ;
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num_epoch = static_cast < int64_t > ( size ) / static_cast < int64_t > ( epoch_size_bytes ) ;
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dump_file . seekg ( 0 , std : : ios : : beg ) ;
}
else
{
return 1 ;
}
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auto abs_E = std : : vector < float > ( num_epoch ) ;
auto abs_P = std : : vector < float > ( num_epoch ) ;
auto abs_L = std : : vector < float > ( num_epoch ) ;
auto Prompt_I = std : : vector < float > ( num_epoch ) ;
auto Prompt_Q = std : : vector < float > ( num_epoch ) ;
auto PRN_start_sample_count = std : : vector < uint64_t > ( num_epoch ) ;
auto acc_carrier_phase_rad = std : : vector < double > ( num_epoch ) ;
auto carrier_doppler_hz = std : : vector < double > ( num_epoch ) ;
auto code_freq_chips = std : : vector < double > ( num_epoch ) ;
auto carr_error_hz = std : : vector < double > ( num_epoch ) ;
auto carr_error_filt_hz = std : : vector < double > ( num_epoch ) ;
auto code_error_chips = std : : vector < double > ( num_epoch ) ;
auto code_error_filt_chips = std : : vector < double > ( num_epoch ) ;
auto CN0_SNV_dB_Hz = std : : vector < double > ( num_epoch ) ;
auto carrier_lock_test = std : : vector < double > ( num_epoch ) ;
auto aux1 = std : : vector < double > ( num_epoch ) ;
auto aux2 = std : : vector < double > ( num_epoch ) ;
auto PRN = std : : vector < uint32_t > ( num_epoch ) ;
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try
{
if ( dump_file . is_open ( ) )
{
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for ( int64_t i = 0 ; i < num_epoch ; i + + )
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{
dump_file . read ( reinterpret_cast < char * > ( & abs_E [ i ] ) , sizeof ( float ) ) ;
dump_file . read ( reinterpret_cast < char * > ( & abs_P [ i ] ) , sizeof ( float ) ) ;
dump_file . read ( reinterpret_cast < char * > ( & abs_L [ i ] ) , sizeof ( float ) ) ;
dump_file . read ( reinterpret_cast < char * > ( & Prompt_I [ i ] ) , sizeof ( float ) ) ;
dump_file . read ( reinterpret_cast < char * > ( & Prompt_Q [ i ] ) , sizeof ( float ) ) ;
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dump_file . read ( reinterpret_cast < char * > ( & PRN_start_sample_count [ i ] ) , sizeof ( uint64_t ) ) ;
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dump_file . read ( reinterpret_cast < char * > ( & acc_carrier_phase_rad [ i ] ) , sizeof ( double ) ) ;
dump_file . read ( reinterpret_cast < char * > ( & carrier_doppler_hz [ i ] ) , sizeof ( double ) ) ;
dump_file . read ( reinterpret_cast < char * > ( & code_freq_chips [ i ] ) , sizeof ( double ) ) ;
dump_file . read ( reinterpret_cast < char * > ( & carr_error_hz [ i ] ) , sizeof ( double ) ) ;
dump_file . read ( reinterpret_cast < char * > ( & carr_error_filt_hz [ i ] ) , sizeof ( double ) ) ;
dump_file . read ( reinterpret_cast < char * > ( & code_error_chips [ i ] ) , sizeof ( double ) ) ;
dump_file . read ( reinterpret_cast < char * > ( & code_error_filt_chips [ i ] ) , sizeof ( double ) ) ;
dump_file . read ( reinterpret_cast < char * > ( & CN0_SNV_dB_Hz [ i ] ) , sizeof ( double ) ) ;
dump_file . read ( reinterpret_cast < char * > ( & carrier_lock_test [ i ] ) , sizeof ( double ) ) ;
dump_file . read ( reinterpret_cast < char * > ( & aux1 [ i ] ) , sizeof ( double ) ) ;
dump_file . read ( reinterpret_cast < char * > ( & aux2 [ i ] ) , sizeof ( double ) ) ;
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dump_file . read ( reinterpret_cast < char * > ( & PRN [ i ] ) , sizeof ( uint32_t ) ) ;
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}
}
dump_file . close ( ) ;
}
catch ( const std : : ifstream : : failure & e )
{
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std : : cerr < < " Problem reading dump file: " < < e . what ( ) < < ' \n ' ;
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return 1 ;
}
// WRITE MAT FILE
mat_t * matfp ;
matvar_t * matvar ;
std : : string filename = d_dump_filename ;
filename . erase ( filename . length ( ) - 4 , 4 ) ;
filename . append ( " .mat " ) ;
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matfp = Mat_CreateVer ( filename . c_str ( ) , nullptr , MAT_FT_MAT73 ) ;
if ( reinterpret_cast < int64_t * > ( matfp ) ! = nullptr )
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{
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std : : array < size_t , 2 > dims { 1 , static_cast < size_t > ( num_epoch ) } ;
matvar = Mat_VarCreate ( " abs_E " , MAT_C_SINGLE , MAT_T_SINGLE , 2 , dims . data ( ) , abs_E . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " abs_P " , MAT_C_SINGLE , MAT_T_SINGLE , 2 , dims . data ( ) , abs_P . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " abs_L " , MAT_C_SINGLE , MAT_T_SINGLE , 2 , dims . data ( ) , abs_L . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " Prompt_I " , MAT_C_SINGLE , MAT_T_SINGLE , 2 , dims . data ( ) , Prompt_I . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " Prompt_Q " , MAT_C_SINGLE , MAT_T_SINGLE , 2 , dims . data ( ) , Prompt_Q . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " PRN_start_sample_count " , MAT_C_UINT64 , MAT_T_UINT64 , 2 , dims . data ( ) , PRN_start_sample_count . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " acc_carrier_phase_rad " , MAT_C_DOUBLE , MAT_T_DOUBLE , 2 , dims . data ( ) , acc_carrier_phase_rad . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " carrier_doppler_hz " , MAT_C_DOUBLE , MAT_T_DOUBLE , 2 , dims . data ( ) , carrier_doppler_hz . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " code_freq_chips " , MAT_C_DOUBLE , MAT_T_DOUBLE , 2 , dims . data ( ) , code_freq_chips . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " carr_error_hz " , MAT_C_DOUBLE , MAT_T_DOUBLE , 2 , dims . data ( ) , carr_error_hz . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " carr_error_filt_hz " , MAT_C_DOUBLE , MAT_T_DOUBLE , 2 , dims . data ( ) , carr_error_filt_hz . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " code_error_chips " , MAT_C_DOUBLE , MAT_T_DOUBLE , 2 , dims . data ( ) , code_error_chips . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " code_error_filt_chips " , MAT_C_DOUBLE , MAT_T_DOUBLE , 2 , dims . data ( ) , code_error_filt_chips . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " CN0_SNV_dB_Hz " , MAT_C_DOUBLE , MAT_T_DOUBLE , 2 , dims . data ( ) , CN0_SNV_dB_Hz . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " carrier_lock_test " , MAT_C_DOUBLE , MAT_T_DOUBLE , 2 , dims . data ( ) , carrier_lock_test . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " aux1 " , MAT_C_DOUBLE , MAT_T_DOUBLE , 2 , dims . data ( ) , aux1 . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " aux2 " , MAT_C_DOUBLE , MAT_T_DOUBLE , 2 , dims . data ( ) , aux2 . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
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matvar = Mat_VarCreate ( " PRN " , MAT_C_UINT32 , MAT_T_UINT32 , 2 , dims . data ( ) , PRN . data ( ) , 0 ) ;
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Mat_VarWrite ( matfp , matvar , MAT_COMPRESSION_ZLIB ) ; // or MAT_COMPRESSION_NONE
Mat_VarFree ( matvar ) ;
}
Mat_Close ( matfp ) ;
return 0 ;
}
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void Glonass_L2_Ca_Dll_Pll_Tracking_cc : : set_channel ( uint32_t channel )
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{
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
{
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d_dump_filename . append ( std : : to_string ( d_channel ) ) ;
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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 Glonass_L2_Ca_Dll_Pll_Tracking_cc : : set_gnss_synchro ( Gnss_Synchro * p_gnss_synchro )
{
d_acquisition_gnss_synchro = p_gnss_synchro ;
}
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void Glonass_L2_Ca_Dll_Pll_Tracking_cc : : check_carrier_phase_coherent_initialization ( )
{
if ( d_acc_carrier_phase_initialized = = false )
{
d_acc_carrier_phase_rad = - d_rem_carr_phase_rad ;
d_acc_carrier_phase_initialized = true ;
}
}
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int Glonass_L2_Ca_Dll_Pll_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_error_hz = 0.0 ;
double carr_error_filt_hz = 0.0 ;
double code_error_chips = 0.0 ;
double code_error_filt_chips = 0.0 ;
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bool loss_of_lock = false ;
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// Block input data and block output stream pointers
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const auto * in = reinterpret_cast < const gr_complex * > ( input_items [ 0 ] ) ; // PRN start block alignment
auto * * out = reinterpret_cast < Gnss_Synchro * * > ( & output_items [ 0 ] ) ;
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// 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 )
{
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const int32_t acq_to_trk_delay_samples = d_sample_counter - d_acq_sample_stamp ;
const double acq_trk_shif_correction_samples = d_current_prn_length_samples - std : : fmod ( static_cast < float > ( acq_to_trk_delay_samples ) , static_cast < float > ( d_current_prn_length_samples ) ) ;
const int32_t samples_offset = round ( d_acq_code_phase_samples + acq_trk_shif_correction_samples ) ;
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current_synchro_data . Tracking_sample_counter = d_sample_counter + static_cast < uint64_t > ( samples_offset ) ;
d_sample_counter = d_sample_counter + static_cast < uint64_t > ( samples_offset ) ; // count for the processed samples
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d_pull_in = false ;
// take into account the carrier cycles accumulated in the pull in signal alignment
d_acc_carrier_phase_rad - = d_carrier_doppler_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 ;
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
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multicorrelator_cpu . set_input_output_vectors ( d_correlator_outs . data ( ) , in ) ;
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multicorrelator_cpu . Carrier_wipeoff_multicorrelator_resampler ( d_rem_carr_phase_rad ,
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static_cast < float > ( d_carrier_phase_step_rad ) ,
static_cast < float > ( d_rem_code_phase_chips ) ,
static_cast < float > ( d_code_phase_step_chips ) ,
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d_current_prn_length_samples ) ;
// ################## PLL ##########################################################
// PLL discriminator
// Update PLL discriminator [rads/Ti -> Secs/Ti]
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carr_error_hz = pll_cloop_two_quadrant_atan ( d_correlator_outs [ 1 ] ) / TWO_PI ; // prompt output
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// Carrier discriminator filter
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carr_error_filt_hz = d_carrier_loop_filter . get_carrier_nco ( static_cast < float > ( carr_error_hz ) ) ;
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// New carrier Doppler frequency estimation
d_carrier_frequency_hz + = carr_error_filt_hz ;
d_carrier_doppler_hz + = carr_error_filt_hz ;
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d_code_freq_chips = GLONASS_L2_CA_CODE_RATE_CPS + ( ( d_carrier_doppler_hz * GLONASS_L2_CA_CODE_RATE_CPS ) / d_glonass_freq_ch ) ;
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// ################## DLL ##########################################################
// DLL discriminator
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code_error_chips = dll_nc_e_minus_l_normalized ( d_correlator_outs [ 0 ] , d_correlator_outs [ 2 ] , static_cast < float > ( d_early_late_spc_chips ) , 1.0 ) ; // [chips/Ti] //early and late
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// Code discriminator filter
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code_error_filt_chips = d_code_loop_filter . get_code_nco ( static_cast < float > ( code_error_chips ) ) ; // [chips/second]
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const double T_chip_seconds = 1.0 / static_cast < double > ( d_code_freq_chips ) ;
const double T_prn_seconds = T_chip_seconds * GLONASS_L2_CA_CODE_LENGTH_CHIPS ;
const double code_error_filt_secs = ( T_prn_seconds * code_error_filt_chips * T_chip_seconds ) ; // [seconds]
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// double code_error_filt_secs = (GPS_L1_CA_CODE_PERIOD * code_error_filt_chips) / GLONASS_L1_CA_CODE_RATE_CPS; // [seconds]
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// ################## CARRIER AND CODE NCO BUFFER ALIGNMENT #######################
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// 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
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// double T_chip_seconds = 1.0 / static_cast<double>(d_code_freq_chips);
// double T_prn_seconds = T_chip_seconds * GLONASS_L1_CA_CODE_LENGTH_CHIPS;
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const double T_prn_samples = T_prn_seconds * static_cast < double > ( d_fs_in ) ;
const double K_blk_samples = T_prn_samples + d_rem_code_phase_samples + code_error_filt_secs * static_cast < double > ( d_fs_in ) ;
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d_current_prn_length_samples = round ( K_blk_samples ) ; // round to a discrete number of samples
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// ################### PLL COMMANDS #################################################
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// carrier phase step (NCO phase increment per sample) [rads/sample]
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d_carrier_doppler_phase_step_rad = TWO_PI * d_carrier_doppler_hz / static_cast < double > ( d_fs_in ) ;
d_carrier_phase_step_rad = TWO_PI * d_carrier_frequency_hz / static_cast < double > ( d_fs_in ) ;
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// remnant carrier phase to prevent overflow in the code NCO
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d_rem_carr_phase_rad = d_rem_carr_phase_rad + static_cast < float > ( d_carrier_phase_step_rad * d_current_prn_length_samples ) ;
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d_rem_carr_phase_rad = fmod ( d_rem_carr_phase_rad , TWO_PI ) ;
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// carrier phase accumulator
d_acc_carrier_phase_rad - = d_carrier_doppler_phase_step_rad * d_current_prn_length_samples ;
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// ################### DLL COMMANDS #################################################
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// 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
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d_Prompt_buffer [ d_cn0_estimation_counter ] = d_correlator_outs [ 1 ] ; // prompt
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d_cn0_estimation_counter + + ;
}
else
{
d_cn0_estimation_counter = 0 ;
// Code lock indicator
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d_CN0_SNV_dB_Hz = cn0_m2m4_estimator ( d_Prompt_buffer . data ( ) , CN0_ESTIMATION_SAMPLES , GLONASS_L2_CA_CODE_PERIOD_S ) ;
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// Carrier lock indicator
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d_carrier_lock_test = carrier_lock_detector ( d_Prompt_buffer . data ( ) , CN0_ESTIMATION_SAMPLES ) ;
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// Loss of lock detection
if ( d_carrier_lock_test < d_carrier_lock_threshold or d_CN0_SNV_dB_Hz < FLAGS_cn0_min )
{
d_carrier_lock_fail_counter + + ;
}
else
{
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if ( d_carrier_lock_fail_counter > 0 )
{
d_carrier_lock_fail_counter - - ;
}
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}
if ( d_carrier_lock_fail_counter > FLAGS_max_lock_fail )
{
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std : : cout < < " Loss of lock in channel " < < d_channel < < " ! \n " ;
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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
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loss_of_lock = true ;
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}
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check_carrier_phase_coherent_initialization ( ) ;
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}
// ########### 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 ( ) ) ;
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current_synchro_data . Tracking_sample_counter = d_sample_counter + static_cast < uint64_t > ( d_current_prn_length_samples ) ;
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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 ;
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current_synchro_data . Flag_valid_symbol_output = ! loss_of_lock ;
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current_synchro_data . correlation_length_ms = 1 ;
}
else
{
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std : : fill_n ( d_correlator_outs . begin ( ) , d_n_correlator_taps , gr_complex ( 0.0 , 0.0 ) ) ;
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current_synchro_data . Tracking_sample_counter = d_sample_counter + static_cast < uint64_t > ( d_current_prn_length_samples ) ;
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current_synchro_data . System = { ' R ' } ;
current_synchro_data . correlation_length_ms = 1 ;
}
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// assign the GNU Radio block output data
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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 ;
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float tmp_E ;
float tmp_P ;
float tmp_L ;
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float tmp_float ;
float tmp_VE = 0.0 ;
float tmp_VL = 0.0 ;
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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
{
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// Dump correlators output
d_dump_file . write ( reinterpret_cast < char * > ( & tmp_VE ) , sizeof ( float ) ) ;
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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 ) ) ;
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d_dump_file . write ( reinterpret_cast < char * > ( & tmp_VL ) , sizeof ( float ) ) ;
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// 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
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d_dump_file . write ( reinterpret_cast < char * > ( & d_sample_counter ) , sizeof ( uint64_t ) ) ;
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// accumulated carrier phase
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tmp_float = static_cast < float > ( d_acc_carrier_phase_rad ) ;
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d_dump_file . write ( reinterpret_cast < char * > ( & tmp_float ) , sizeof ( float ) ) ;
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// carrier and code frequency
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tmp_float = static_cast < float > ( d_carrier_doppler_hz ) ;
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d_dump_file . write ( reinterpret_cast < char * > ( & tmp_float ) , sizeof ( float ) ) ;
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tmp_float = static_cast < float > ( d_code_freq_chips ) ;
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d_dump_file . write ( reinterpret_cast < char * > ( & tmp_float ) , sizeof ( float ) ) ;
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// PLL commands
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tmp_float = static_cast < float > ( carr_error_hz ) ;
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d_dump_file . write ( reinterpret_cast < char * > ( & tmp_float ) , sizeof ( float ) ) ;
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tmp_float = static_cast < float > ( carr_error_filt_hz ) ;
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d_dump_file . write ( reinterpret_cast < char * > ( & tmp_float ) , sizeof ( float ) ) ;
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// DLL commands
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tmp_float = static_cast < float > ( code_error_chips ) ;
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d_dump_file . write ( reinterpret_cast < char * > ( & tmp_float ) , sizeof ( float ) ) ;
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tmp_float = static_cast < float > ( code_error_filt_chips ) ;
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d_dump_file . write ( reinterpret_cast < char * > ( & tmp_float ) , sizeof ( float ) ) ;
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// CN0 and carrier lock test
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tmp_float = static_cast < float > ( d_CN0_SNV_dB_Hz ) ;
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d_dump_file . write ( reinterpret_cast < char * > ( & tmp_float ) , sizeof ( float ) ) ;
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tmp_float = static_cast < float > ( d_carrier_lock_test ) ;
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d_dump_file . write ( reinterpret_cast < char * > ( & tmp_float ) , sizeof ( float ) ) ;
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// AUX vars (for debug purposes)
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tmp_float = static_cast < float > ( d_rem_code_phase_samples ) ;
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d_dump_file . write ( reinterpret_cast < char * > ( & tmp_float ) , sizeof ( float ) ) ;
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auto tmp_double = static_cast < double > ( d_sample_counter + d_current_prn_length_samples ) ;
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d_dump_file . write ( reinterpret_cast < char * > ( & tmp_double ) , sizeof ( double ) ) ;
// PRN
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uint32_t prn_ = d_acquisition_gnss_synchro - > PRN ;
d_dump_file . write ( reinterpret_cast < char * > ( & prn_ ) , sizeof ( uint32_t ) ) ;
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}
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
}