/*! * \file pcps_acquisition_fpga.h * \brief This class implements a Parallel Code Phase Search Acquisition for the FPGA * * * 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", Birkhauser, 2007. pp 81-84 * * \authors * * ----------------------------------------------------------------------------- * * Copyright (C) 2010-2020 (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. * * SPDX-License-Identifier: GPL-3.0-or-later * * ----------------------------------------------------------------------------- */ #ifndef GNSS_SDR_PCPS_ACQUISITION_FPGA_H #define GNSS_SDR_PCPS_ACQUISITION_FPGA_H #include "channel_fsm.h" #include "fpga_acquisition.h" #include #include // for uint32_t #include // for shared_ptr #include // for string class Gnss_Synchro; typedef struct { /* pcps acquisition configuration */ std::string device_name; int64_t fs_in; float doppler_step2; uint32_t* all_fft_codes; // pointer to memory that contains all the code ffts uint32_t doppler_max; uint32_t select_queue_Fpga; uint32_t downsampling_factor; uint32_t total_block_exp; uint32_t excludelimit; uint32_t num_doppler_bins_step2; uint32_t max_num_acqs; int32_t samples_per_code; int32_t code_length; bool make_2_steps; bool repeat_satellite; } pcpsconf_fpga_t; class pcps_acquisition_fpga; using pcps_acquisition_fpga_sptr = std::shared_ptr; pcps_acquisition_fpga_sptr pcps_make_acquisition_fpga(pcpsconf_fpga_t conf_); /*! * \brief This class implements a Parallel Code Phase Search Acquisition that uses the FPGA. * * Check \ref Navitec2012 "An Open Source Galileo E1 Software Receiver", * Algorithm 1, for a pseudocode description of this implementation. */ class pcps_acquisition_fpga { public: /*! * \brief Destructor */ ~pcps_acquisition_fpga() = default; /*! * \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 PCPS acquisition algorithm. */ void set_local_code(); /*! * \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 Starts acquisition algorithm, turning from standby mode to * active mode * \param active - bool that activates/deactivates the block. */ void set_active(bool active); /*! * \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 = channel_fsm; } /*! * \brief Set statistics threshold of PCPS 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; d_acquisition_fpga->set_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; d_acquisition_fpga->set_doppler_step(doppler_step); } /*! * \brief Set Doppler center frequency for the grid search. It will refresh the Doppler grid. * \param doppler_center - Frequency center of the search grid [Hz]. */ inline void set_doppler_center(int32_t doppler_center) { if (doppler_center != d_doppler_center) { DLOG(INFO) << " Doppler assistance for Channel: " << d_channel << " => Doppler: " << doppler_center << "[Hz]"; d_doppler_center = doppler_center; } } /*! * \brief This function triggers a HW reset of the FPGA PL. */ void reset_acquisition(); private: friend pcps_acquisition_fpga_sptr pcps_make_acquisition_fpga(pcpsconf_fpga_t conf_); explicit pcps_acquisition_fpga(pcpsconf_fpga_t conf_); void send_negative_acquisition(); void send_positive_acquisition(); void acquisition_core(uint32_t num_doppler_bins, uint32_t doppler_step, int32_t doppler_min); 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); std::shared_ptr d_acquisition_fpga; std::weak_ptr d_channel_fsm; pcpsconf_fpga_t d_acq_parameters; Gnss_Synchro* d_gnss_synchro; uint64_t d_sample_counter; float d_threshold; float d_mag; float d_input_power; float d_test_statistics; float d_doppler_step2; float d_doppler_center_step_two; int32_t d_doppler_center; int32_t d_state; uint32_t d_doppler_index; uint32_t d_channel; uint32_t d_doppler_step; uint32_t d_doppler_max; uint32_t d_fft_size; uint32_t d_num_doppler_bins; uint32_t d_downsampling_factor; uint32_t d_select_queue_Fpga; uint32_t d_total_block_exp; uint32_t d_num_doppler_bins_step2; uint32_t d_max_num_acqs; bool d_active; bool d_make_2_steps; }; #endif // GNSS_SDR_PCPS_ACQUISITION_FPGA_H