mirror of
https://github.com/gnss-sdr/gnss-sdr
synced 2024-07-07 20:24:21 +00:00
247 lines
7.7 KiB
C++
247 lines
7.7 KiB
C++
/*!
|
|
* \file pcps_acquisition_fine_doppler_acquisition_cc.h
|
|
* \brief This class implements a Parallel Code Phase Search Acquisition with multi-dwells and fine Doppler estimation
|
|
*
|
|
* Acquisition strategy (Kay Borre book + CFAR threshold).
|
|
* <ol>
|
|
* <li> Compute the input signal power estimation
|
|
* <li> Doppler serial search loop
|
|
* <li> Perform the FFT-based circular convolution (parallel time search)
|
|
* <li> Record the maximum peak and the associated synchronization parameters
|
|
* <li> Compute the test statistics and compare to the threshold
|
|
* <li> Declare positive or negative acquisition using a message queue
|
|
* </ol>
|
|
*
|
|
* Kay Borre book: 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. pp 81-84
|
|
*
|
|
* \authors <ul>
|
|
* <li> Javier Arribas, 2013. jarribas(at)cttc.es
|
|
* </ul>
|
|
*
|
|
* -------------------------------------------------------------------------
|
|
*
|
|
* 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_PCPS_ACQUISITION_FINE_DOPPLER_CC_H_
|
|
#define GNSS_SDR_PCPS_ACQUISITION_FINE_DOPPLER_CC_H_
|
|
|
|
#include <fstream>
|
|
#include <queue>
|
|
#include <string>
|
|
#include <boost/thread/mutex.hpp>
|
|
#include <boost/thread/thread.hpp>
|
|
#include <gnuradio/block.h>
|
|
#include <gnuradio/msg_queue.h>
|
|
#include <gnuradio/gr_complex.h>
|
|
#include <gnuradio/fft/fft.h>
|
|
#include "concurrent_queue.h"
|
|
#include "gnss_synchro.h"
|
|
|
|
class pcps_acquisition_fine_doppler_cc;
|
|
|
|
typedef boost::shared_ptr<pcps_acquisition_fine_doppler_cc>
|
|
pcps_acquisition_fine_doppler_cc_sptr;
|
|
|
|
pcps_acquisition_fine_doppler_cc_sptr
|
|
pcps_make_acquisition_fine_doppler_cc(int max_dwells, unsigned int sampled_ms,
|
|
int doppler_max, int doppler_min, long freq, long fs_in, int samples_per_ms,
|
|
boost::shared_ptr<gr::msg_queue> queue, bool dump, std::string dump_filename);
|
|
|
|
/*!
|
|
* \brief This class implements a Parallel Code Phase Search Acquisition.
|
|
*
|
|
* Check \ref Navitec2012 "An Open Source Galileo E1 Software Receiver",
|
|
* Algorithm 1, for a pseudocode description of this implementation.
|
|
*/
|
|
|
|
class pcps_acquisition_fine_doppler_cc: public gr::block
|
|
{
|
|
private:
|
|
friend pcps_acquisition_fine_doppler_cc_sptr
|
|
pcps_make_acquisition_fine_doppler_cc(int max_dwells, unsigned int sampled_ms,
|
|
int doppler_max, int doppler_min, long freq, long fs_in,
|
|
int samples_per_ms, boost::shared_ptr<gr::msg_queue> queue, bool dump,
|
|
std::string dump_filename);
|
|
|
|
pcps_acquisition_fine_doppler_cc(int max_dwells, unsigned int sampled_ms,
|
|
int doppler_max, int doppler_min, long freq, long fs_in,
|
|
int samples_per_ms, boost::shared_ptr<gr::msg_queue> queue, bool dump,
|
|
std::string dump_filename);
|
|
|
|
void calculate_magnitudes(gr_complex* fft_begin, int doppler_shift,
|
|
int doppler_offset);
|
|
|
|
int compute_and_accumulate_grid(gr_vector_const_void_star &input_items);
|
|
int estimate_Doppler(gr_vector_const_void_star &input_items, int available_samples);
|
|
float estimate_input_power(gr_vector_const_void_star &input_items);
|
|
double search_maximum();
|
|
void reset_grid();
|
|
void update_carrier_wipeoff();
|
|
void free_grid_memory();
|
|
|
|
long d_fs_in;
|
|
long d_freq;
|
|
int d_samples_per_ms;
|
|
int d_max_dwells;
|
|
unsigned int d_doppler_resolution;
|
|
int d_gnuradio_forecast_samples;
|
|
float d_threshold;
|
|
std::string d_satellite_str;
|
|
int d_config_doppler_max;
|
|
int d_config_doppler_min;
|
|
|
|
int d_num_doppler_points;
|
|
int d_doppler_step;
|
|
unsigned int d_sampled_ms;
|
|
unsigned int d_fft_size;
|
|
unsigned long int d_sample_counter;
|
|
gr_complex* d_carrier;
|
|
gr_complex* d_fft_codes;
|
|
float* d_magnitude;
|
|
|
|
float** d_grid_data;
|
|
gr_complex** d_grid_doppler_wipeoffs;
|
|
|
|
gr::fft::fft_complex* d_fft_if;
|
|
gr::fft::fft_complex* d_ifft;
|
|
Gnss_Synchro *d_gnss_synchro;
|
|
unsigned int d_code_phase;
|
|
float d_doppler_freq;
|
|
float d_input_power;
|
|
float d_test_statistics;
|
|
boost::shared_ptr<gr::msg_queue> d_queue;
|
|
concurrent_queue<int> *d_channel_internal_queue;
|
|
std::ofstream d_dump_file;
|
|
int d_state;
|
|
bool d_active;
|
|
int d_well_count;
|
|
bool d_dump;
|
|
unsigned int d_channel;
|
|
|
|
std::string d_dump_filename;
|
|
|
|
public:
|
|
/*!
|
|
* \brief Default destructor.
|
|
*/
|
|
~pcps_acquisition_fine_doppler_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.
|
|
*/
|
|
void set_gnss_synchro(Gnss_Synchro* p_gnss_synchro)
|
|
{
|
|
d_gnss_synchro = p_gnss_synchro;
|
|
}
|
|
|
|
/*!
|
|
* \brief Returns the maximum peak of grid search.
|
|
*/
|
|
unsigned int mag()
|
|
{
|
|
return d_test_statistics;
|
|
}
|
|
|
|
/*!
|
|
* \brief Initializes acquisition algorithm.
|
|
*/
|
|
void init();
|
|
|
|
/*!
|
|
* \brief Sets local code for PCPS acquisition algorithm.
|
|
* \param code - Pointer to the PRN code.
|
|
*/
|
|
void set_local_code(std::complex<float> * code);
|
|
|
|
/*!
|
|
* \brief Starts acquisition algorithm, turning from standby mode to
|
|
* active mode
|
|
* \param active - bool that activates/deactivates the block.
|
|
*/
|
|
void set_active(bool active)
|
|
{
|
|
d_active = active;
|
|
}
|
|
|
|
/*!
|
|
* \brief Set acquisition channel unique ID
|
|
* \param channel - receiver channel.
|
|
*/
|
|
void set_channel(unsigned int channel)
|
|
{
|
|
d_channel = channel;
|
|
}
|
|
|
|
/*!
|
|
* \brief Set statistics threshold of PCPS algorithm.
|
|
* \param threshold - Threshold for signal detection (check \ref Navitec2012,
|
|
* Algorithm 1, for a definition of this threshold).
|
|
*/
|
|
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].
|
|
*/
|
|
void set_doppler_max(unsigned int doppler_max)
|
|
{
|
|
d_config_doppler_max = doppler_max;
|
|
}
|
|
|
|
/*!
|
|
* \brief Set Doppler steps for the grid search
|
|
* \param doppler_step - Frequency bin of the search grid [Hz].
|
|
*/
|
|
void set_doppler_step(unsigned int doppler_step);
|
|
|
|
|
|
/*!
|
|
* \brief Set tracking channel internal queue.
|
|
* \param channel_internal_queue - Channel's internal blocks information queue.
|
|
*/
|
|
void set_channel_queue(concurrent_queue<int> *channel_internal_queue)
|
|
{
|
|
d_channel_internal_queue = channel_internal_queue;
|
|
}
|
|
|
|
/*!
|
|
* \brief Parallel Code Phase Search 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);
|
|
|
|
void forecast (int noutput_items, gr_vector_int &ninput_items_required);
|
|
|
|
};
|
|
|
|
#endif /* pcps_acquisition_fine_doppler_cc*/
|