mirror of https://github.com/gnss-sdr/gnss-sdr
117 lines
3.6 KiB
C++
117 lines
3.6 KiB
C++
/*!
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* \file gps_l1_ca_telemetry_decoder_gs.h
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* \brief Interface of a NAV message demodulator block based on
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* Kay Borre book MATLAB-based GPS receiver
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* \author Javier Arribas, 2011. jarribas(at)cttc.es
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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_GPS_L1_CA_TELEMETRY_DECODER_GS_H
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#define GNSS_SDR_GPS_L1_CA_TELEMETRY_DECODER_GS_H
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#include "GPS_L1_CA.h"
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#include "gnss_satellite.h"
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#include "gnss_synchro.h"
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#include "gps_navigation_message.h"
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#include <boost/circular_buffer.hpp>
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#include <gnuradio/block.h> // for block
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#include <gnuradio/types.h> // for gr_vector_const_void_star
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#include <array> // for array
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#include <cstdint> // for int32_t
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#include <fstream> // for ofstream
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#include <string> // for string
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#if GNURADIO_USES_STD_POINTERS
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#include <memory> // for std::shared_ptr
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#else
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#include <boost/shared_ptr.hpp>
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#endif
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class gps_l1_ca_telemetry_decoder_gs;
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#if GNURADIO_USES_STD_POINTERS
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using gps_l1_ca_telemetry_decoder_gs_sptr = std::shared_ptr<gps_l1_ca_telemetry_decoder_gs>;
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#else
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using gps_l1_ca_telemetry_decoder_gs_sptr = boost::shared_ptr<gps_l1_ca_telemetry_decoder_gs>;
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#endif
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gps_l1_ca_telemetry_decoder_gs_sptr gps_l1_ca_make_telemetry_decoder_gs(
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const Gnss_Satellite &satellite,
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bool dump);
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/*!
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* \brief This class implements a block that decodes the NAV data defined in IS-GPS-200K
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*/
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class gps_l1_ca_telemetry_decoder_gs : public gr::block
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{
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public:
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~gps_l1_ca_telemetry_decoder_gs();
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void set_satellite(const Gnss_Satellite &satellite); //!< Set satellite PRN
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void set_channel(int channel); //!< Set receiver's channel
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void reset();
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/*!
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* \brief This is where all signal processing takes place
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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, gr_vector_void_star &output_items);
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private:
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friend gps_l1_ca_telemetry_decoder_gs_sptr gps_l1_ca_make_telemetry_decoder_gs(
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const Gnss_Satellite &satellite,
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bool dump);
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gps_l1_ca_telemetry_decoder_gs(const Gnss_Satellite &satellite, bool dump);
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bool gps_word_parityCheck(uint32_t gpsword);
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bool decode_subframe();
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Gps_Navigation_Message d_nav;
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Gnss_Satellite d_satellite;
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std::array<int32_t, GPS_CA_PREAMBLE_LENGTH_BITS> d_preamble_samples{};
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std::string d_dump_filename;
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std::ofstream d_dump_file;
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boost::circular_buffer<float> d_symbol_history;
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uint64_t d_sample_counter;
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uint64_t d_preamble_index;
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uint64_t d_last_valid_preamble;
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int32_t d_bits_per_preamble;
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int32_t d_samples_per_preamble;
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int32_t d_preamble_period_symbols;
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int32_t d_CRC_error_counter;
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int32_t d_channel;
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uint32_t d_required_symbols;
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uint32_t d_frame_length_symbols;
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uint32_t d_prev_GPS_frame_4bytes;
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uint32_t d_max_symbols_without_valid_frame;
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uint32_t d_stat;
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uint32_t d_TOW_at_Preamble_ms;
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uint32_t d_TOW_at_current_symbol_ms;
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bool d_flag_frame_sync;
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bool d_flag_parity;
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bool d_flag_preamble;
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bool d_sent_tlm_failed_msg;
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bool d_flag_PLL_180_deg_phase_locked;
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bool d_flag_TOW_set;
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bool d_dump;
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};
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#endif // GNSS_SDR_GPS_L1_CA_TELEMETRY_DECODER_GS_H
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