/*!
* \file pcps_cccwsr_acquisition_cc.h
* \brief This class implements a Parallel Code Phase Search acquisition
* with Coherent Channel Combining With Sign Recovery scheme.
* \author Marc Molina, 2013. marc.molina.pena(at)gmail.com
*
* D.Borio, C.O'Driscoll, G.Lachapelle, "Coherent, Noncoherent and
* Differentially Coherent Combining Techniques for Acquisition of
* New Composite GNSS Signals", IEEE Transactions On Aerospace and
* Electronic Systems vol. 45 no. 3, July 2009, section IV
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2019 (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 .
*
* -------------------------------------------------------------------------
*/
#ifndef GNSS_SDR_PCPS_CCCWSR_ACQUISITION_CC_H_
#define GNSS_SDR_PCPS_CCCWSR_ACQUISITION_CC_H_
#include "channel_fsm.h"
#include "gnss_synchro.h"
#include
#include
#include
#include
#include
#include
#include
#include
class pcps_cccwsr_acquisition_cc;
using pcps_cccwsr_acquisition_cc_sptr = boost::shared_ptr;
pcps_cccwsr_acquisition_cc_sptr pcps_cccwsr_make_acquisition_cc(
uint32_t sampled_ms,
uint32_t max_dwells,
uint32_t doppler_max,
int64_t fs_in,
int32_t samples_per_ms,
int32_t samples_per_code,
bool dump,
std::string dump_filename);
/*!
* \brief This class implements a Parallel Code Phase Search Acquisition with
* Coherent Channel Combining With Sign Recovery scheme.
*/
class pcps_cccwsr_acquisition_cc : public gr::block
{
public:
/*!
* \brief Default destructor.
*/
~pcps_cccwsr_acquisition_cc();
/*!
* \brief Set acquisition/tracking common Gnss_Synchro object pointer
* to exchange synchronization data between acquisition and tracking blocks.
* \param p_gnss_synchro Satellite information shared by the processing blocks.
*/
inline void set_gnss_synchro(Gnss_Synchro* p_gnss_synchro)
{
d_gnss_synchro = p_gnss_synchro;
}
/*!
* \brief Returns the maximum peak of grid search.
*/
inline uint32_t mag() const
{
return d_mag;
}
/*!
* \brief Initializes acquisition algorithm.
*/
void init();
/*!
* \brief Sets local code for CCCWSR acquisition algorithm.
* \param data_code - Pointer to the data PRN code.
* \param pilot_code - Pointer to the pilot PRN code.
*/
void set_local_code(std::complex* code_data, std::complex* code_pilot);
/*!
* \brief Starts acquisition algorithm, turning from standby mode to
* active mode
* \param active - bool that activates/deactivates the block.
*/
inline void set_active(bool active)
{
d_active = active;
}
/*!
* \brief If set to 1, ensures that acquisition starts at the
* first available sample.
* \param state - int=1 forces start of acquisition
*/
void set_state(int32_t state);
/*!
* \brief Set acquisition channel unique ID
* \param channel - receiver channel.
*/
inline void set_channel(uint32_t channel)
{
d_channel = channel;
}
/*!
* \brief Set channel fsm associated to this acquisition instance
*/
inline void set_channel_fsm(std::weak_ptr channel_fsm)
{
d_channel_fsm = std::move(channel_fsm);
}
/*!
* \brief Set statistics threshold of CCCWSR algorithm.
* \param threshold - Threshold for signal detection (check \ref Navitec2012,
* Algorithm 1, for a definition of this threshold).
*/
inline void set_threshold(float threshold)
{
d_threshold = threshold;
}
/*!
* \brief Set maximum Doppler grid search
* \param doppler_max - Maximum Doppler shift considered in the grid search [Hz].
*/
inline void set_doppler_max(uint32_t doppler_max)
{
d_doppler_max = doppler_max;
}
/*!
* \brief Set Doppler steps for the grid search
* \param doppler_step - Frequency bin of the search grid [Hz].
*/
inline void set_doppler_step(uint32_t doppler_step)
{
d_doppler_step = doppler_step;
}
/*!
* \brief Coherent Channel Combining With Sign Recovery Acquisition signal processing.
*/
int general_work(int noutput_items, gr_vector_int& ninput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items);
private:
friend pcps_cccwsr_acquisition_cc_sptr
pcps_cccwsr_make_acquisition_cc(uint32_t sampled_ms, uint32_t max_dwells,
uint32_t doppler_max, int64_t fs_in,
int32_t samples_per_ms, int32_t samples_per_code,
bool dump, std::string dump_filename);
pcps_cccwsr_acquisition_cc(uint32_t sampled_ms, uint32_t max_dwells,
uint32_t doppler_max, int64_t fs_in,
int32_t samples_per_ms, int32_t samples_per_code,
bool dump, std::string dump_filename);
void calculate_magnitudes(gr_complex* fft_begin, int32_t doppler_shift,
int32_t doppler_offset);
int64_t d_fs_in;
int32_t d_samples_per_ms;
int32_t d_samples_per_code;
uint32_t d_doppler_resolution;
float d_threshold;
std::string d_satellite_str;
uint32_t d_doppler_max;
uint32_t d_doppler_step;
uint32_t d_sampled_ms;
uint32_t d_max_dwells;
uint32_t d_well_count;
uint32_t d_fft_size;
uint64_t d_sample_counter;
std::vector> d_grid_doppler_wipeoffs;
uint32_t d_num_doppler_bins;
std::vector d_fft_code_data;
std::vector d_fft_code_pilot;
std::shared_ptr d_fft_if;
std::shared_ptr d_ifft;
Gnss_Synchro* d_gnss_synchro;
uint32_t d_code_phase;
float d_doppler_freq;
float d_mag;
std::vector d_magnitude;
std::vector d_data_correlation;
std::vector d_pilot_correlation;
std::vector d_correlation_plus;
std::vector d_correlation_minus;
float d_input_power;
float d_test_statistics;
std::ofstream d_dump_file;
bool d_active;
int32_t d_state;
bool d_dump;
uint32_t d_channel;
std::weak_ptr d_channel_fsm;
std::string d_dump_filename;
};
#endif /* GNSS_SDR_PCPS_CCCWSR_ACQUISITION_CC_H_ */