mirror of https://github.com/gnss-sdr/gnss-sdr
148 lines
4.6 KiB
C++
148 lines
4.6 KiB
C++
/*!
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* \file galileo_telemetry_decoder_gs.h
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* \brief Implementation of a Galileo unified INAV and FNAV message demodulator block
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* \author Javier Arribas 2018. jarribas(at)cttc.es
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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 GNSS_SDR_GALILEO_TELEMETRY_DECODER_GS_H_
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#define GNSS_SDR_GALILEO_TELEMETRY_DECODER_GS_H_
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#include "galileo_fnav_message.h"
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#include "galileo_navigation_message.h"
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#include "gnss_satellite.h"
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#include <boost/circular_buffer.hpp>
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#include <boost/shared_ptr.hpp> // for boost::shared_ptr
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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>
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#include <cstdint>
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#include <fstream>
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#include <string>
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#include <vector>
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class galileo_telemetry_decoder_gs;
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using galileo_telemetry_decoder_gs_sptr = boost::shared_ptr<galileo_telemetry_decoder_gs>;
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galileo_telemetry_decoder_gs_sptr galileo_make_telemetry_decoder_gs(
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const Gnss_Satellite &satellite,
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int frame_type,
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bool dump);
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/*!
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* \brief This class implements a block that decodes the INAV and FNAV data defined in Galileo ICD
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*/
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class galileo_telemetry_decoder_gs : public gr::block
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{
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public:
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~galileo_telemetry_decoder_gs();
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void set_satellite(const Gnss_Satellite &satellite); //!< Set satellite PRN
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void set_channel(int32_t channel); //!< Set receiver's channel
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void reset();
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int32_t flag_even_word_arrived;
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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 galileo_telemetry_decoder_gs_sptr galileo_make_telemetry_decoder_gs(
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const Gnss_Satellite &satellite,
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int frame_type,
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bool dump);
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galileo_telemetry_decoder_gs(const Gnss_Satellite &satellite, int frame_type, bool dump);
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void viterbi_decoder(float *page_part_symbols, int32_t *page_part_bits);
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void deinterleaver(int32_t rows, int32_t cols, const float *in, float *out);
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void decode_INAV_word(float *page_part_symbols, int32_t frame_length);
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void decode_FNAV_word(float *page_symbols, int32_t frame_length);
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int d_frame_type;
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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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std::vector<int32_t> d_preamble_samples;
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uint32_t d_PRN_code_period_ms;
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uint32_t d_required_symbols;
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uint32_t d_frame_length_symbols;
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std::vector<float> d_page_part_symbols;
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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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uint32_t d_max_symbols_without_valid_frame;
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bool d_sent_tlm_failed_msg;
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uint32_t d_stat;
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bool d_flag_frame_sync;
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bool flag_PLL_180_deg_phase_locked;
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bool d_flag_parity;
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bool d_flag_preamble;
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int32_t d_CRC_error_counter;
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// navigation message vars
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Galileo_Navigation_Message d_inav_nav;
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Galileo_Fnav_Message d_fnav_nav;
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bool d_dump;
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Gnss_Satellite d_satellite;
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int32_t d_channel;
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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 flag_TOW_set;
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double delta_t; // GPS-GALILEO time offset
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std::string d_dump_filename;
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std::ofstream d_dump_file;
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// vars for Viterbi decoder
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std::vector<int32_t> out0;
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std::vector<int32_t> out1;
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std::vector<int32_t> state0;
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std::vector<int32_t> state1;
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std::array<int32_t, 2> g_encoder{};
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const int32_t nn = 2; // Coding rate 1/n
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const int32_t KK = 7; // Constraint Length
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int32_t mm = KK - 1;
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int32_t CodeLength;
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int32_t DataLength;
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};
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#endif // GNSS_SDR_GALILEO_TELEMETRY_DECODER_GS_H_
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