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gnss-sdr/src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking.h

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/*!
* \file dll_pll_veml_tracking.h
* \brief Implementation of a code DLL + carrier PLL VEML (Very Early
* Minus Late) tracking block for Galileo E1 signals
* \author Luis Esteve, 2012. luis(at)epsilon-formacion.com
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2018 (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_DLL_PLL_VEML_TRACKING_H
#define GNSS_SDR_DLL_PLL_VEML_TRACKING_H
#define DLL_PLL_CN0_ESTIMATION_SAMPLES 20
#define DLL_PLL_MINIMUM_VALID_CN0 25
#define DLL_PLL_MAXIMUM_LOCK_FAIL_COUNTER 50
#define DLL_PLL_CARRIER_LOCK_THRESHOLD 0.85
#include <fstream>
#include <string>
#include <gnuradio/block.h>
#include "gnss_synchro.h"
#include "tracking_2nd_DLL_filter.h"
#include "tracking_2nd_PLL_filter.h"
#include "cpu_multicorrelator_real_codes.h"
class dll_pll_veml_tracking;
typedef boost::shared_ptr<dll_pll_veml_tracking> dll_pll_veml_tracking_sptr;
dll_pll_veml_tracking_sptr dll_pll_veml_make_tracking(double fs_in, unsigned int vector_length,
bool dump, std::string dump_filename,
float pll_bw_hz, float dll_bw_hz,
float pll_bw_narrow_hz, float dll_bw_narrow_hz,
float early_late_space_chips, float very_early_late_space_chips,
float early_late_space_narrow_chips,
float very_early_late_space_narrow_chips,
int extend_correlation_symbols, bool track_pilot,
char system, char signal[3], bool veml);
/*!
* \brief This class implements a code DLL + carrier PLL VEML (Very Early
* Minus Late) tracking block for Galileo E1 signals
*/
class dll_pll_veml_tracking : public gr::block
{
public:
~dll_pll_veml_tracking();
void set_channel(unsigned int channel);
void set_gnss_synchro(Gnss_Synchro *p_gnss_synchro);
void start_tracking();
/*!
* \brief 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
*/
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 dll_pll_veml_tracking_sptr dll_pll_veml_make_tracking(double fs_in, unsigned int vector_length,
bool dump, std::string dump_filename,
float pll_bw_hz, float dll_bw_hz, float pll_bw_narrow_hz,
float dll_bw_narrow_hz, float early_late_space_chips,
float very_early_late_space_chips, float early_late_space_narrow_chips,
float very_early_late_space_narrow_chips,
int extend_correlation_symbols, bool track_pilot,
char system, char signal[3], bool veml);
dll_pll_veml_tracking(double fs_in, unsigned int vector_length,
bool dump,
std::string dump_filename,
float pll_bw_hz,
float dll_bw_hz,
float pll_bw_narrow_hz,
float dll_bw_narrow_hz,
float early_late_space_chips,
float very_early_late_space_chips,
float early_late_space_narrow_chips,
float very_early_late_space_narrow_chips,
int extend_correlation_symbols,
bool track_pilot,
char system, char signal[3], bool veml);
bool cn0_and_tracking_lock_status();
void do_correlation_step(const gr_complex *input_samples);
void run_dll_pll(bool disable_costas_loop);
void update_local_code();
void update_local_carrier();
bool acquire_secondary();
void clear_tracking_vars();
void log_data();
// tracking configuration vars
bool d_dump;
bool d_veml;
bool d_secondary;
unsigned int d_secondary_code_length;
std::string *d_secondary_code_string;
Gnss_Synchro *d_acquisition_gnss_synchro;
unsigned int d_vector_length;
unsigned int d_channel;
// long d_fs_in;
double d_fs_in;
//Signal parameters
double d_signal_carrier_freq;
double d_code_period;
double d_code_chip_rate;
unsigned int d_code_length_chips;
//tracking state machine
int d_state;
//Integration period in samples
int d_correlation_length_samples;
int d_correlation_length_ms;
int d_n_correlator_taps;
double d_early_late_spc_chips;
double d_very_early_late_spc_chips;
double d_early_late_spc_narrow_chips;
double d_very_early_late_spc_narrow_chips;
float *d_tracking_code;
float *d_data_code;
float *d_local_code_shift_chips;
float *d_null_shift;
gr_complex *d_correlator_outs;
cpu_multicorrelator_real_codes multicorrelator_cpu;
//TODO: currently the multicorrelator does not support adding extra correlator
//with different local code, thus we need extra multicorrelator instance.
//Implement this functionality inside multicorrelator class
//as an enhancement to increase the performance
cpu_multicorrelator_real_codes correlator_data_cpu; //for data channel
gr_complex *d_Very_Early;
gr_complex *d_Early;
gr_complex *d_Prompt;
gr_complex *d_Late;
gr_complex *d_Very_Late;
bool d_enable_extended_integration;
int d_extend_correlation_symbols;
int d_extend_correlation_symbols_count;
int d_current_symbol;
gr_complex d_VE_accu;
gr_complex d_E_accu;
gr_complex d_P_accu;
gr_complex d_L_accu;
gr_complex d_VL_accu;
bool d_track_pilot;
gr_complex *d_Prompt_Data;
double d_code_phase_step_chips;
double d_carrier_phase_step_rad;
// remaining code phase and carrier phase between tracking loops
double d_rem_code_phase_samples;
double d_rem_carr_phase_rad;
// PLL and DLL filter library
Tracking_2nd_DLL_filter d_code_loop_filter;
Tracking_2nd_PLL_filter d_carrier_loop_filter;
// acquisition
double d_acq_code_phase_samples;
double d_acq_carrier_doppler_hz;
// tracking parameters
float d_dll_bw_hz;
float d_pll_bw_hz;
float d_dll_bw_narrow_hz;
float d_pll_bw_narrow_hz;
// tracking vars
double d_carr_error_hz;
double d_carr_error_filt_hz;
double d_code_error_chips;
double d_code_error_filt_chips;
double d_K_blk_samples;
double d_code_freq_chips;
double d_carrier_doppler_hz;
double d_acc_carrier_phase_rad;
double d_rem_code_phase_chips;
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;
std::deque<gr_complex> d_Prompt_buffer_deque;
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;
// file dump
std::string d_dump_filename;
std::ofstream d_dump_file;
std::string systemName;
std::string signal_type;
int save_matfile();
};
#endif //GNSS_SDR_DLL_PLL_VEML_TRACKING_H
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