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/*!
* \file gps_l1_ca_dll_fll_pll_tracking_cc.cc
* \brief Implementation of a code DLL + carrier FLL/PLL tracking block
* \author Javier Arribas, 2011. jarribas(at)cttc.es
*
* This file implements the code Delay Locked Loop (DLL) + carrier
* Phase Locked Loop (PLL) helped with a carrier Frequency Locked Loop (FLL)
* according to the algorithms described in:
* E.D. Kaplan and C. Hegarty, Understanding GPS. Principles and
* Applications, Second Edition, Artech House Publishers, 2005.
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2011 (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 "gnss_synchro.h"
#include "gps_l1_ca_dll_fll_pll_tracking_cc.h"
//#include "gnss_signal_processing.h"
#include "gps_sdr_signal_processing.h"
#include "GPS_L1_CA.h"
#include "tracking_discriminators.h"
#include "CN_estimators.h"
#include "tracking_FLL_PLL_filter.h"
#include "control_message_factory.h"
#include "gnss_flowgraph.h"
#include <boost/lexical_cast.hpp>
#include <iostream>
#include <sstream>
#include <cmath>
#include "math.h"
#include <gnuradio/gr_io_signature.h>
#include <glog/log_severity.h>
#include <glog/logging.h>
/*!
* \todo Include in definition header file
*/
#define CN0_ESTIMATION_SAMPLES 10
#define MINIMUM_VALID_CN0 25
#define MAXIMUM_LOCK_FAIL_COUNTER 200
using google::LogMessage;
gps_l1_ca_dll_fll_pll_tracking_cc_sptr
gps_l1_ca_dll_fll_pll_make_tracking_cc(
long if_freq,
long fs_in,
unsigned
int vector_length,
gr_msg_queue_sptr queue,
bool dump, std::string dump_filename,
int order,
float fll_bw_hz,
float pll_bw_hz,
float dll_bw_hz,
float early_late_space_chips)
{
return gps_l1_ca_dll_fll_pll_tracking_cc_sptr(new Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc(if_freq,
fs_in, vector_length, queue, dump, dump_filename, order, fll_bw_hz, pll_bw_hz,dll_bw_hz,
early_late_space_chips));
}
void Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::forecast (int noutput_items, gr_vector_int &ninput_items_required)
{
ninput_items_required[0] = d_vector_length*2; //set the required available samples in each call
}
Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc(
long if_freq,
long fs_in,
unsigned int vector_length,
gr_msg_queue_sptr queue,
bool dump,
std::string dump_filename,
int order,
float fll_bw_hz,
float pll_bw_hz,
float dll_bw_hz,
float early_late_space_chips) :
gr_block ("Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc", gr_make_io_signature (1, 1, sizeof(gr_complex)),
gr_make_io_signature(1, 1, sizeof(Gnss_Synchro)))
{
// initialize internal vars
d_queue = queue;
d_dump = dump;
d_acquisition_gnss_synchro=NULL;
d_if_freq = (double)if_freq;
d_fs_in = (double)fs_in;
d_vector_length = vector_length;
d_early_late_spc_chips = (double)early_late_space_chips; // Define early-late offset (in chips)
d_dump_filename = dump_filename;
// Initialize tracking variables ==========================================
d_carrier_loop_filter.set_params(fll_bw_hz,pll_bw_hz,order);
// Get space for a vector with the C/A code replica sampled 1x/chip
d_ca_code = new gr_complex[(int)GPS_L1_CA_CODE_LENGTH_CHIPS + 2];
/* If an array is partitioned for more than one thread to operate on,
* having the sub-array boundaries unaligned to cache lines could lead
* to performance degradation. Here we allocate memory
* (gr_comlex array of size 2*d_vector_length) aligned to cache of 16 bytes
*/
// todo: do something if posix_memalign fails
// Get space for the resampled early / prompt / late local replicas
if (posix_memalign((void**)&d_early_code, 16, d_vector_length * sizeof(gr_complex) * 2) == 0){};
if (posix_memalign((void**)&d_late_code, 16, d_vector_length * sizeof(gr_complex) * 2) == 0){};
if (posix_memalign((void**)&d_prompt_code, 16, d_vector_length * sizeof(gr_complex) * 2) == 0){};
// space for carrier wipeoff and signal baseband vectors
if (posix_memalign((void**)&d_carr_sign, 16, d_vector_length * sizeof(gr_complex) * 2) == 0){};
// correlator outputs (scalar)
if (posix_memalign((void**)&d_Early, 16, sizeof(gr_complex)) == 0){};
if (posix_memalign((void**)&d_Prompt, 16, sizeof(gr_complex)) == 0){};
if (posix_memalign((void**)&d_Late, 16, sizeof(gr_complex)) == 0){};
// sample synchronization
d_sample_counter = 0;
d_acq_sample_stamp = 0;
d_last_seg = 0;// this is for debug output only
d_code_phase_samples=0;
d_enable_tracking = false;
d_current_prn_length_samples = (int)d_vector_length;
// 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 = 20;
systemName["G"] = std::string("GPS");
systemName["R"] = std::string("GLONASS");
systemName["S"] = std::string("SBAS");
systemName["E"] = std::string("Galileo");
systemName["C"] = std::string("Compass");
}
void Gps_L1_Ca_Dll_Fll_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;
unsigned long int acq_trk_diff_samples;
double acq_trk_diff_seconds;
acq_trk_diff_samples = d_sample_counter - d_acq_sample_stamp;//-d_vector_length;
acq_trk_diff_seconds = (double)acq_trk_diff_samples / d_fs_in;
//doppler effect
// Fd=(C/(C+Vr))*F
double radial_velocity;
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_hz = radial_velocity * GPS_L1_CA_CODE_RATE_HZ;
T_chip_mod_seconds = 1 / d_code_freq_hz;
T_prn_mod_seconds = T_chip_mod_seconds * GPS_L1_CA_CODE_LENGTH_CHIPS;
T_prn_mod_samples = T_prn_mod_seconds * 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 * d_fs_in;
double T_prn_diff_seconds;
T_prn_diff_seconds = T_prn_true_seconds - T_prn_mod_seconds;
double N_prn_diff;
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 * 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;
// DLL/PLL filter initialization
d_carrier_loop_filter.initialize(d_acq_carrier_doppler_hz);
d_FLL_wait = 1;
// generate local reference ALWAYS starting at chip 1 (1 sample per chip)
gps_l1_ca_code_gen_complex(&d_ca_code[1], d_acquisition_gnss_synchro->PRN, 0);
d_ca_code[0] = d_ca_code[(int)GPS_L1_CA_CODE_LENGTH_CHIPS];
d_ca_code[(int)GPS_L1_CA_CODE_LENGTH_CHIPS + 1] = d_ca_code[1];
d_carrier_lock_fail_counter = 0;
d_Prompt_prev = 0;
d_rem_code_phase_samples = 0;
d_rem_carr_phase = 0;
d_FLL_discriminator_hz = 0;
d_rem_code_phase_samples = 0;
d_acc_carrier_phase_rad = 0;
std::string sys_ = &d_acquisition_gnss_synchro->System;
sys = sys_.substr(0,1);
// DEBUG OUTPUT
std::cout << "Tracking start on channel " << d_channel << " for satellite " << Gnss_Satellite(systemName[sys], d_acquisition_gnss_synchro->PRN) << std::endl;
DLOG(INFO) << "Start tracking for satellite " << d_acquisition_gnss_synchro->System << " "<< d_acquisition_gnss_synchro->PRN << " received ";
// enable tracking Gnss_Satellite(systemName[&d_acquisition_gnss_synchro->System], d_acquisition_gnss_synchro->PRN)
d_pull_in = true;
d_enable_tracking = true;
std::cout << "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 << std::endl;
}
void Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::update_local_code()
{
double tcode_chips;
double rem_code_phase_chips;
double code_phase_step_chips;
int associated_chip_index;
int code_length_chips = (int)GPS_L1_CA_CODE_LENGTH_CHIPS;
code_phase_step_chips = d_code_freq_hz / d_fs_in;
rem_code_phase_chips = d_rem_code_phase_samples * (d_code_freq_hz / d_fs_in);
// unified loop for E, P, L code vectors
tcode_chips = -rem_code_phase_chips;
for (int i=0; i<d_current_prn_length_samples; i++)
{
associated_chip_index = 1 + round(fmod(tcode_chips - d_early_late_spc_chips, code_length_chips));
d_early_code[i] = d_ca_code[associated_chip_index];
associated_chip_index = 1 + round(fmod(tcode_chips, code_length_chips));
d_prompt_code[i] = d_ca_code[associated_chip_index];
associated_chip_index = 1 + round(fmod(tcode_chips + d_early_late_spc_chips, code_length_chips));
d_late_code[i] = d_ca_code[associated_chip_index];
tcode_chips = tcode_chips + code_phase_step_chips;
}
}
void Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::update_local_carrier()
{
double phase, phase_step;
phase_step = GPS_TWO_PI * d_carrier_doppler_hz / d_fs_in;
phase = d_rem_carr_phase;
for(int i = 0; i < d_current_prn_length_samples; i++)
{
d_carr_sign[i] = gr_complex(cos(phase), sin(phase));
phase += phase_step;
}
d_rem_carr_phase = fmod(phase, GPS_TWO_PI);
d_acc_carrier_phase_rad = d_acc_carrier_phase_rad + phase;
}
Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::~Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc()
{
d_dump_file.close();
delete[] d_ca_code;
free(d_prompt_code);
free(d_late_code);
free(d_early_code);
free(d_carr_sign);
free(d_Early);
free(d_Prompt);
free(d_Late);
delete[] d_Prompt_buffer;
}
/* Tracking signal processing
* Notice that this is a class derived from gr_sync_decimator, so each of the ninput_items has vector_length samples
*/
int Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::general_work (int noutput_items, gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
{
double code_error_chips = 0;
double correlation_time_s = 0;
double PLL_discriminator_hz = 0;
double carr_nco_hz = 0;
// get the sample in and out pointers
const gr_complex* in = (gr_complex*) input_items[0]; //block input samples pointer
Gnss_Synchro **out = (Gnss_Synchro **) &output_items[0]; //block output streams pointer
d_Prompt_prev = *d_Prompt; // for the FLL discriminator
if (d_enable_tracking == true)
{
// GNSS_SYNCHRO OBJECT to interchange data between tracking->telemetry_decoder
Gnss_Synchro current_synchro_data;
// 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((double)acq_to_trk_delay_samples, (double)d_current_prn_length_samples);
samples_offset = round(d_acq_code_phase_samples + acq_trk_shif_correction_samples);
// /todo: Check if the sample counter sent to the next block as a time reference should be incremented AFTER sended or BEFORE
d_sample_counter = d_sample_counter + samples_offset; //count for the processed samples
d_pull_in = false;
consume_each(samples_offset); //shift input to perform alignment with local replica
// make an output to not stop the rest of the processing blocks
current_synchro_data.Prompt_I=0.0;
current_synchro_data.Prompt_Q=0.0;
current_synchro_data.Tracking_timestamp_secs=(double)d_sample_counter/d_fs_in;
current_synchro_data.Carrier_phase_rads=0.0;
current_synchro_data.Code_phase_secs=0.0;
current_synchro_data.CN0_dB_hz=0.0;
current_synchro_data.Flag_valid_tracking=false;
*out[0] =current_synchro_data;
return 1;
}
update_local_code();
update_local_carrier();
// perform Early, Prompt and Late correlation
d_correlator.Carrier_wipeoff_and_EPL_volk(d_current_prn_length_samples,
in,
d_carr_sign,
d_early_code,
d_prompt_code,
d_late_code,
d_Early,
d_Prompt,
d_Late);
// check for samples consistency (this should be done before in the receiver / here only if the source is a file)
if (std::isnan((*d_Prompt).real()) == true or std::isnan((*d_Prompt).imag()) == true )// or std::isinf(in[i].real())==true or std::isinf(in[i].imag())==true)
{
const int samples_available = ninput_items[0];
d_sample_counter = d_sample_counter + samples_available;
LOG_AT_LEVEL(WARNING) << "Detected NaN samples at sample number " << d_sample_counter;
consume_each(samples_available);
// make an output to not stop the rest of the processing blocks
current_synchro_data.Prompt_I=0.0;
current_synchro_data.Prompt_Q=0.0;
current_synchro_data.Tracking_timestamp_secs=(double)d_sample_counter/d_fs_in;
current_synchro_data.Carrier_phase_rads=0.0;
current_synchro_data.Code_phase_secs=0.0;
current_synchro_data.CN0_dB_hz=0.0;
current_synchro_data.Flag_valid_tracking=false;
*out[0] =current_synchro_data;
return 1;
}
/*
* DLL, FLL, and PLL discriminators
*/
// Compute DLL error
code_error_chips = dll_nc_e_minus_l_normalized(*d_Early,*d_Late);
//compute FLL error
correlation_time_s = ((double)d_current_prn_length_samples) / d_fs_in;
if (d_FLL_wait == 1)
{
d_Prompt_prev = *d_Prompt;
d_FLL_wait = 0;
}
else
{
d_FLL_discriminator_hz = fll_four_quadrant_atan(d_Prompt_prev, *d_Prompt, 0, correlation_time_s) / GPS_TWO_PI;
d_Prompt_prev = *d_Prompt;
d_FLL_wait = 1;
}
// Compute PLL error
PLL_discriminator_hz = pll_cloop_two_quadrant_atan(*d_Prompt) / GPS_TWO_PI;
/*
* \todo Update FLL assistance algorithm!
*/
if ((((double)d_sample_counter - (double)d_acq_sample_stamp) / d_fs_in) > 3)
{
d_FLL_discriminator_hz = 0; //disconnect the FLL after the initial lock
}
/*
* DLL and FLL+PLL filter and get current carrier Doppler and code frequency
*/
carr_nco_hz = d_carrier_loop_filter.get_carrier_error(d_FLL_discriminator_hz, PLL_discriminator_hz, correlation_time_s);
d_carrier_doppler_hz = d_if_freq + carr_nco_hz;
d_code_freq_hz = GPS_L1_CA_CODE_RATE_HZ - (((d_carrier_doppler_hz - d_if_freq) * GPS_L1_CA_CODE_RATE_HZ) / GPS_L1_FREQ_HZ) - code_error_chips;
/*!
* \todo Improve the lock detection algorithm!
*/
// ####### 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_Prompt;
d_cn0_estimation_counter++;
}
else
{
d_cn0_estimation_counter = 0;
d_CN0_SNV_dB_Hz = gps_l1_ca_CN0_SNV(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES, d_fs_in);
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES);
// ###### TRACKING UNLOCK NOTIFICATION #####
if (std::abs(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 << "Channel " << d_channel << " loss of lock!" << std::endl;
ControlMessageFactory* cmf = new ControlMessageFactory();
if (d_queue != gr_msg_queue_sptr()) {
d_queue->handle(cmf->GetQueueMessage(d_channel, 2));
}
delete cmf;
d_carrier_lock_fail_counter = 0;
d_enable_tracking = false; // TODO: check if disabling tracking is consistent with the channel state machine
}
}
// ########## DEBUG OUTPUT
/*!
* \todo The stop timer has to be moved to the signal source!
*/
// debug: Second counter in channel 0
if (d_channel == 0)
{
if (floor(d_sample_counter/d_fs_in) != d_last_seg)
{
d_last_seg = floor(d_sample_counter/d_fs_in);
std::cout << "Current input signal time = " << d_last_seg << " [s]" << std::endl;
std::cout << "Tracking CH " << d_channel << ": Satellite " << Gnss_Satellite(systemName[sys], d_acquisition_gnss_synchro->PRN) << ", CN0 = " << d_CN0_SNV_dB_Hz << " [dB-Hz]" << std::endl;
}
}
else
{
if (floor(d_sample_counter/d_fs_in) != d_last_seg)
{
d_last_seg = floor(d_sample_counter/d_fs_in);
std::cout << "Tracking CH " << d_channel << ": Satellite " << Gnss_Satellite(systemName[sys], d_acquisition_gnss_synchro->PRN) << ", CN0 = " << d_CN0_SNV_dB_Hz << " [dB-Hz]" << std::endl;
}
}
//predict the next loop PRN period length prediction
double T_chip_seconds;
double T_prn_seconds;
double T_prn_samples;
double K_blk_samples;
T_chip_seconds = 1/d_code_freq_hz;
T_prn_seconds = T_chip_seconds * GPS_L1_CA_CODE_LENGTH_CHIPS;
T_prn_samples = T_prn_seconds * d_fs_in;
K_blk_samples = T_prn_samples + d_rem_code_phase_samples;
d_current_prn_length_samples = round(K_blk_samples); //round to a discrete sample
d_rem_code_phase_samples = K_blk_samples - d_current_prn_length_samples; //rounding error
// ########### Output the tracking data to navigation and PVT ##########
current_synchro_data.Prompt_I=(double)(*d_Prompt).imag();
current_synchro_data.Prompt_Q=(double)(*d_Prompt).real();
// Tracking_timestamp_secs is aligned with the PRN start sample
current_synchro_data.Tracking_timestamp_secs=((double)d_sample_counter+(double)d_current_prn_length_samples+d_rem_code_phase_samples)/d_fs_in;
// This tracking block aligns the Tracking_timestamp_secs with the start sample of the PRN, Code_phase_secs=0
current_synchro_data.Code_phase_secs=0;
current_synchro_data.Carrier_phase_rads=d_acc_carrier_phase_rad;
current_synchro_data.CN0_dB_hz=d_CN0_SNV_dB_Hz;
current_synchro_data.Flag_valid_tracking=true;
*out[0] =current_synchro_data;
}
else
{
*d_Early = gr_complex(0,0);
*d_Prompt = gr_complex(0,0);
*d_Late = gr_complex(0,0);
Gnss_Synchro **out = (Gnss_Synchro **) &output_items[0]; //block output streams pointer
*out[0]=*d_acquisition_gnss_synchro;
}
if(d_dump)
{
// MULTIPLEXED FILE RECORDING - Record results to file
float prompt_I;
float prompt_Q;
float tmp_E, tmp_P, tmp_L;
float tmp_float;
double tmp_double;
prompt_I = (*d_Prompt).imag();
prompt_Q = (*d_Prompt).real();
tmp_E=std::abs<float>(*d_Early);
tmp_P=std::abs<float>(*d_Prompt);
tmp_L=std::abs<float>(*d_Late);
try
{
// EPR
d_dump_file.write((char*)&tmp_E, sizeof(float));
d_dump_file.write((char*)&tmp_P, sizeof(float));
d_dump_file.write((char*)&tmp_L, sizeof(float));
// PROMPT I and Q (to analyze navigation symbols)
d_dump_file.write((char*)&prompt_I, sizeof(float));
d_dump_file.write((char*)&prompt_Q, sizeof(float));
// PRN start sample stamp
//tmp_float=(float)d_sample_counter;
d_dump_file.write((char*)&d_sample_counter, sizeof(unsigned long int));
// accumulated carrier phase
tmp_float=(float)d_acc_carrier_phase_rad;
d_dump_file.write((char*)&tmp_float, sizeof(float));
// carrier and code frequency
tmp_float=(float)d_carrier_doppler_hz;
d_dump_file.write((char*)&tmp_float, sizeof(float));
tmp_float=(float)d_code_freq_hz;
d_dump_file.write((char*)&tmp_float, sizeof(float));
//PLL commands
tmp_float=(float)PLL_discriminator_hz;
d_dump_file.write((char*)&tmp_float, sizeof(float));
tmp_float=(float)carr_nco_hz;
d_dump_file.write((char*)&tmp_float, sizeof(float));
//DLL commands
tmp_float=(float)code_error_chips;
d_dump_file.write((char*)&tmp_float, sizeof(float));
tmp_float=(float)d_code_phase_samples;
d_dump_file.write((char*)&tmp_float, sizeof(float));
// CN0 and carrier lock test
tmp_float=(float)d_CN0_SNV_dB_Hz;
d_dump_file.write((char*)&tmp_float, sizeof(float));
tmp_float=(float)d_carrier_lock_test;
d_dump_file.write((char*)&tmp_float, sizeof(float));
// AUX vars (for debug purposes)
tmp_float = (float)d_rem_code_phase_samples;
d_dump_file.write((char*)&tmp_float, sizeof(float));
tmp_double=(double)(d_sample_counter+d_current_prn_length_samples);
d_dump_file.write((char*)&tmp_double, sizeof(double));
}
catch (std::ifstream::failure e)
{
std::cout << "Exception writing trk dump file "<< e.what() << std::endl;
}
}
consume_each(d_current_prn_length_samples); // this is necesary 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_Dll_Fll_Pll_Tracking_cc::set_channel(unsigned int channel)
{
d_channel = channel;
DLOG(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);
std::cout << "Tracking dump enabled on channel " << d_channel << " Log file: " << d_dump_filename.c_str() << std::endl;
}
catch (std::ifstream::failure e)
{
std::cout << "channel " << d_channel << " Exception opening trk dump file " << e.what() << std::endl;
}
}
}
}
void Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::set_channel_queue(concurrent_queue<int> *channel_internal_queue)
{
d_channel_internal_queue = channel_internal_queue;
}
void Gps_L1_Ca_Dll_Fll_Pll_Tracking_cc::set_gnss_synchro(Gnss_Synchro* p_gnss_synchro)
{
d_acquisition_gnss_synchro=p_gnss_synchro;
}
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