mirror of https://github.com/gnss-sdr/gnss-sdr
261 lines
8.0 KiB
C++
261 lines
8.0 KiB
C++
/*!
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* \file galileo_e5a_noncoherent_iq_acquisition_caf_cc.h
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* \brief Adapts a PCPS acquisition block to an AcquisitionInterface for
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* Galileo E5a data and pilot Signals
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* \author Marc Sales, 2014. marcsales92(at)gmail.com
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* \based on work from:
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* <ul>
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* <li> Javier Arribas, 2011. jarribas(at)cttc.es
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* <li> Luis Esteve, 2012. luis(at)epsilon-formacion.com
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* <li> Marc Molina, 2013. marc.molina.pena@gmail.com
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* </ul>
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*
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2019 (see AUTHORS file for a list of contributors)
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*
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* GNSS-SDR is a software defined Global Navigation
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* Satellite Systems receiver
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*
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* This file is part of GNSS-SDR.
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*
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* GNSS-SDR is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GNSS-SDR is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
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*
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* -------------------------------------------------------------------------
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*/
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#ifndef GALILEO_E5A_NONCOHERENT_IQ_ACQUISITION_CAF_CC_H_
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#define GALILEO_E5A_NONCOHERENT_IQ_ACQUISITION_CAF_CC_H_
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#include "channel_fsm.h"
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#include "gnss_synchro.h"
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#include <gnuradio/block.h>
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#include <gnuradio/fft/fft.h>
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#include <gnuradio/gr_complex.h>
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#include <fstream>
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#include <memory>
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#include <string>
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#include <utility>
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#include <vector>
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class galileo_e5a_noncoherentIQ_acquisition_caf_cc;
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using galileo_e5a_noncoherentIQ_acquisition_caf_cc_sptr = boost::shared_ptr<galileo_e5a_noncoherentIQ_acquisition_caf_cc>;
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galileo_e5a_noncoherentIQ_acquisition_caf_cc_sptr galileo_e5a_noncoherentIQ_make_acquisition_caf_cc(
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unsigned int sampled_ms,
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unsigned int max_dwells,
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unsigned int doppler_max, int64_t fs_in,
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int samples_per_ms, int samples_per_code,
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bool bit_transition_flag,
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bool dump,
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std::string dump_filename,
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bool both_signal_components_,
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int CAF_window_hz_,
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int Zero_padding_);
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/*!
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* \brief This class implements a Parallel Code Phase Search Acquisition.
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*
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* Check \ref Navitec2012 "An Open Source Galileo E1 Software Receiver",
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* Algorithm 1, for a pseudocode description of this implementation.
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*/
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class galileo_e5a_noncoherentIQ_acquisition_caf_cc : public gr::block
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{
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public:
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/*!
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* \brief Default destructor.
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*/
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~galileo_e5a_noncoherentIQ_acquisition_caf_cc();
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/*!
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* \brief Set acquisition/tracking common Gnss_Synchro object pointer
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* to exchange synchronization data between acquisition and tracking blocks.
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* \param p_gnss_synchro Satellite information shared by the processing blocks.
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*/
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inline void set_gnss_synchro(Gnss_Synchro* p_gnss_synchro)
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{
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d_gnss_synchro = p_gnss_synchro;
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}
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/*!
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* \brief Returns the maximum peak of grid search.
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*/
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inline unsigned int mag() const
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{
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return d_mag;
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}
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/*!
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* \brief Initializes acquisition algorithm.
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*/
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void init();
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/*!
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* \brief Sets local code for PCPS acquisition algorithm.
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* \param code - Pointer to the PRN code.
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*/
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void set_local_code(std::complex<float>* code, std::complex<float>* codeQ);
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/*!
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* \brief Starts acquisition algorithm, turning from standby mode to
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* active mode
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* \param active - bool that activates/deactivates the block.
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*/
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inline void set_active(bool active)
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{
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d_active = active;
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}
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/*!
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* \brief If set to 1, ensures that acquisition starts at the
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* first available sample.
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* \param state - int=1 forces start of acquisition
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*/
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void set_state(int state);
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/*!
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* \brief Set acquisition channel unique ID
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* \param channel - receiver channel.
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*/
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inline void set_channel(unsigned int channel)
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{
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d_channel = channel;
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}
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/*!
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* \brief Set channel fsm associated to this acquisition instance
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*/
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inline void set_channel_fsm(std::weak_ptr<ChannelFsm> channel_fsm)
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{
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d_channel_fsm = std::move(channel_fsm);
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}
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/*!
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* \brief Set statistics threshold of PCPS algorithm.
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* \param threshold - Threshold for signal detection (check \ref Navitec2012,
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* Algorithm 1, for a definition of this threshold).
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*/
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inline void set_threshold(float threshold)
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{
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d_threshold = threshold;
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}
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/*!
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* \brief Set maximum Doppler grid search
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* \param doppler_max - Maximum Doppler shift considered in the grid search [Hz].
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*/
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inline void set_doppler_max(unsigned int doppler_max)
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{
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d_doppler_max = doppler_max;
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}
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/*!
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* \brief Set Doppler steps for the grid search
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* \param doppler_step - Frequency bin of the search grid [Hz].
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*/
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inline void set_doppler_step(unsigned int doppler_step)
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{
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d_doppler_step = doppler_step;
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}
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/*!
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* \brief Parallel Code Phase Search Acquisition signal processing.
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*/
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int general_work(int noutput_items, gr_vector_int& ninput_items,
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gr_vector_const_void_star& input_items,
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gr_vector_void_star& output_items);
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private:
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friend galileo_e5a_noncoherentIQ_acquisition_caf_cc_sptr
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galileo_e5a_noncoherentIQ_make_acquisition_caf_cc(
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unsigned int sampled_ms,
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unsigned int max_dwells,
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unsigned int doppler_max, int64_t fs_in,
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int samples_per_ms, int samples_per_code,
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bool bit_transition_flag,
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bool dump,
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std::string dump_filename,
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bool both_signal_components_,
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int CAF_window_hz_,
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int Zero_padding_);
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galileo_e5a_noncoherentIQ_acquisition_caf_cc(
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unsigned int sampled_ms,
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unsigned int max_dwells,
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unsigned int doppler_max, int64_t fs_in,
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int samples_per_ms, int samples_per_code,
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bool bit_transition_flag,
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bool dump,
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std::string dump_filename,
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bool both_signal_components_,
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int CAF_window_hz_,
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int Zero_padding_);
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void calculate_magnitudes(gr_complex* fft_begin, int doppler_shift,
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int doppler_offset);
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float estimate_input_power(gr_complex* in);
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std::weak_ptr<ChannelFsm> d_channel_fsm;
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int64_t d_fs_in;
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int d_samples_per_ms;
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int d_sampled_ms;
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int d_samples_per_code;
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unsigned int d_doppler_resolution;
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float d_threshold;
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std::string d_satellite_str;
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unsigned int d_doppler_max;
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unsigned int d_doppler_step;
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unsigned int d_max_dwells;
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unsigned int d_well_count;
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unsigned int d_fft_size;
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uint64_t d_sample_counter;
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std::vector<std::vector<gr_complex>> d_grid_doppler_wipeoffs;
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unsigned int d_num_doppler_bins;
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std::vector<gr_complex> d_fft_code_I_A;
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std::vector<gr_complex> d_fft_code_I_B;
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std::vector<gr_complex> d_fft_code_Q_A;
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std::vector<gr_complex> d_fft_code_Q_B;
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std::vector<gr_complex> d_inbuffer;
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std::shared_ptr<gr::fft::fft_complex> d_fft_if;
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std::shared_ptr<gr::fft::fft_complex> d_ifft;
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Gnss_Synchro* d_gnss_synchro;
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unsigned int d_code_phase;
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float d_doppler_freq;
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float d_mag;
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std::vector<float> d_magnitudeIA;
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std::vector<float> d_magnitudeIB;
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std::vector<float> d_magnitudeQA;
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std::vector<float> d_magnitudeQB;
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float d_input_power;
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float d_test_statistics;
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bool d_bit_transition_flag;
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std::ofstream d_dump_file;
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bool d_active;
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int d_state;
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bool d_dump;
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bool d_both_signal_components;
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int d_CAF_window_hz;
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std::vector<float> d_CAF_vector;
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std::vector<float> d_CAF_vector_I;
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std::vector<float> d_CAF_vector_Q;
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unsigned int d_channel;
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std::string d_dump_filename;
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unsigned int d_buffer_count;
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unsigned int d_gr_stream_buffer;
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};
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#endif /* GALILEO_E5A_NONCOHERENT_IQ_ACQUISITION_CAF_CC_H_ */
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