mirror of https://github.com/gnss-sdr/gnss-sdr
234 lines
6.5 KiB
C++
234 lines
6.5 KiB
C++
/*!
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* \file pcps_acquisition_fpga.h
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* \brief This class implements a Parallel Code Phase Search Acquisition for the FPGA
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*
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*
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* Kay Borre book: K.Borre, D.M.Akos, N.Bertelsen, P.Rinder, and S.H.Jensen,
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* "A Software-Defined GPS and Galileo Receiver. A Single-Frequency
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* Approach", Birkhauser, 2007. pp 81-84
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*
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* \authors <ul>
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* <li> Marc Majoral, 2019. mmajoral(at)cttc.es
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* <li> Javier Arribas, 2019. jarribas(at)cttc.es
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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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* SPDX-License-Identifier: GPL-3.0-or-later
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*
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* -------------------------------------------------------------------------
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*/
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#ifndef GNSS_SDR_PCPS_ACQUISITION_FPGA_H
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#define GNSS_SDR_PCPS_ACQUISITION_FPGA_H
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#include "channel_fsm.h"
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#include "fpga_acquisition.h"
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#include <glog/logging.h>
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#include <cstdint> // for uint32_t
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#include <memory> // for shared_ptr
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#include <string> // for string
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class Gnss_Synchro;
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typedef struct
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{
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/* pcps acquisition configuration */
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std::string device_name;
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int64_t fs_in;
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float doppler_step2;
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uint32_t* all_fft_codes; // pointer to memory that contains all the code ffts
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uint32_t doppler_max;
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uint32_t select_queue_Fpga;
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uint32_t downsampling_factor;
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uint32_t total_block_exp;
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uint32_t excludelimit;
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uint32_t num_doppler_bins_step2;
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uint32_t max_num_acqs;
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int32_t samples_per_code;
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int32_t code_length;
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bool make_2_steps;
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bool repeat_satellite;
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} pcpsconf_fpga_t;
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class pcps_acquisition_fpga;
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using pcps_acquisition_fpga_sptr = std::shared_ptr<pcps_acquisition_fpga>;
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pcps_acquisition_fpga_sptr pcps_make_acquisition_fpga(pcpsconf_fpga_t conf_);
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/*!
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* \brief This class implements a Parallel Code Phase Search Acquisition that uses the FPGA.
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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 pcps_acquisition_fpga
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{
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public:
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/*!
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* \brief Destructor
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*/
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~pcps_acquisition_fpga() = default;
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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 uint32_t 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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*/
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void set_local_code();
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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(int32_t state);
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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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void set_active(bool active);
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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(uint32_t 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 = 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(uint32_t doppler_max)
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{
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d_doppler_max = doppler_max;
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d_acquisition_fpga->set_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(uint32_t doppler_step)
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{
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d_doppler_step = doppler_step;
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d_acquisition_fpga->set_doppler_step(doppler_step);
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}
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/*!
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* \brief Set Doppler center frequency for the grid search. It will refresh the Doppler grid.
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* \param doppler_center - Frequency center of the search grid [Hz].
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*/
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inline void set_doppler_center(int32_t doppler_center)
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{
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if (doppler_center != d_doppler_center)
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{
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DLOG(INFO) << " Doppler assistance for Channel: " << d_channel << " => Doppler: " << doppler_center << "[Hz]";
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d_doppler_center = doppler_center;
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}
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}
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/*!
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* \brief This function triggers a HW reset of the FPGA PL.
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*/
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void reset_acquisition();
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private:
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friend pcps_acquisition_fpga_sptr pcps_make_acquisition_fpga(pcpsconf_fpga_t conf_);
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explicit pcps_acquisition_fpga(pcpsconf_fpga_t conf_);
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void send_negative_acquisition();
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void send_positive_acquisition();
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void acquisition_core(uint32_t num_doppler_bins, uint32_t doppler_step, int32_t doppler_min);
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float first_vs_second_peak_statistic(uint32_t& indext, int32_t& doppler, uint32_t num_doppler_bins, int32_t doppler_max, int32_t doppler_step);
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pcpsconf_fpga_t d_acq_parameters;
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std::shared_ptr<Fpga_Acquisition> d_acquisition_fpga;
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std::weak_ptr<ChannelFsm> d_channel_fsm;
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Gnss_Synchro* d_gnss_synchro;
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uint64_t d_sample_counter;
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float d_threshold;
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float d_mag;
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float d_input_power;
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float d_test_statistics;
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float d_doppler_step2;
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float d_doppler_center_step_two;
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int32_t d_doppler_center;
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int32_t d_state;
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uint32_t d_doppler_index;
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uint32_t d_channel;
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uint32_t d_doppler_step;
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uint32_t d_doppler_max;
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uint32_t d_fft_size;
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uint32_t d_num_doppler_bins;
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uint32_t d_downsampling_factor;
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uint32_t d_select_queue_Fpga;
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uint32_t d_total_block_exp;
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uint32_t d_num_doppler_bins_step2;
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uint32_t d_max_num_acqs;
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bool d_active;
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bool d_make_2_steps;
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};
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#endif // GNSS_SDR_PCPS_ACQUISITION_FPGA_H
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