mirror of https://github.com/gnss-sdr/gnss-sdr
125 lines
4.6 KiB
C++
125 lines
4.6 KiB
C++
/*!
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* \file beidou_b3i_telemetry_decoder_gs.h
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* \brief Implementation of a BEIDOU B3I DNAV data decoder block
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* \author Damian Miralles, 2019. dmiralles2009(at)gmail.com
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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_BEIDOU_B3I_TELEMETRY_DECODER_GS_H_
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#define GNSS_SDR_BEIDOU_B3I_TELEMETRY_DECODER_GS_H_
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#include "beidou_dnav_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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class beidou_b3i_telemetry_decoder_gs;
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using beidou_b3i_telemetry_decoder_gs_sptr =
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boost::shared_ptr<beidou_b3i_telemetry_decoder_gs>;
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beidou_b3i_telemetry_decoder_gs_sptr beidou_b3i_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 BeiDou DNAV data.
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*/
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class beidou_b3i_telemetry_decoder_gs : public gr::block
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{
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public:
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~beidou_b3i_telemetry_decoder_gs(); //!< Class destructor
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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,
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gr_vector_void_star &output_items);
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private:
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friend beidou_b3i_telemetry_decoder_gs_sptr beidou_b3i_make_telemetry_decoder_gs(
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const Gnss_Satellite &satellite,
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bool dump);
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beidou_b3i_telemetry_decoder_gs(const Gnss_Satellite &satellite, bool dump);
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void decode_subframe(float *symbols);
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void decode_word(int32_t word_counter, const float *enc_word_symbols,
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int32_t *dec_word_symbols);
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void decode_bch15_11_01(const int32_t *bits, std::array<int32_t, 15> &decbits);
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// Preamble decoding
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std::array<int32_t, BEIDOU_DNAV_PREAMBLE_LENGTH_SYMBOLS> d_preamble_samples{};
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int32_t d_symbols_per_preamble;
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int32_t d_samples_per_preamble;
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int32_t d_preamble_period_samples;
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std::array<float, BEIDOU_DNAV_PREAMBLE_PERIOD_SYMBOLS> d_subframe_symbols{};
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uint32_t d_required_symbols;
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// Storage for incoming data
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boost::circular_buffer<float> d_symbol_history;
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// Variables for internal functionality
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uint64_t d_sample_counter; // Sample counter as an index (1,2,3,..etc) indicating number of samples processed
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uint64_t d_preamble_index; // Index of sample number where preamble was found
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uint32_t d_stat; // Status of decoder
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bool d_flag_frame_sync; // Indicate when a frame sync is achieved
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bool d_flag_preamble; // Flag indicating when preamble was found
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int32_t d_CRC_error_counter; // Number of failed CRC operations
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bool flag_SOW_set; // Indicates when time of week is set
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// Navigation Message variable
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Beidou_Dnav_Navigation_Message d_nav;
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// Values to populate gnss synchronization structure
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uint32_t d_symbol_duration_ms;
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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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uint64_t d_last_valid_preamble;
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bool d_flag_valid_word;
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bool d_sent_tlm_failed_msg;
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bool Flag_valid_word;
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// Satellite Information and logging capacity
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Gnss_Satellite d_satellite;
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int32_t d_channel;
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bool d_dump;
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std::string d_dump_filename;
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std::ofstream d_dump_file;
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};
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#endif // GNSS_SDR_BEIDOU_B3I_TELEMETRY_DECODER_GS_H_
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