mirror of https://github.com/gnss-sdr/gnss-sdr
129 lines
4.9 KiB
C++
129 lines
4.9 KiB
C++
/*!
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* \file beidou_b1i_telemetry_decoder_cc.h
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* \brief Implementation of an adapter of a BEIDOU BI1 DNAV data decoder block
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* to a TelemetryDecoderInterface
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* \details Code added as part of GSoC 2018 program. However new modifications included to mimic
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* decoding of existing signals
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* \author Damian Miralles, 2018. dmiralles2009(at)gmail.com
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* \author Sergi Segura, 2018. sergi.segura.munoz(at)gmail.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_BEIDOU_B1I_TELEMETRY_DECODER_CC_H
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#define GNSS_SDR_BEIDOU_B1I_TELEMETRY_DECODER_CC_H
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#include "Beidou_DNAV.h"
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#include "Beidou_B1I.h"
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#include "beidou_dnav_almanac.h"
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#include "beidou_dnav_ephemeris.h"
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#include "beidou_dnav_navigation_message.h"
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#include "beidou_dnav_utc_model.h"
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#include "gnss_satellite.h"
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#include "gnss_synchro.h"
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#include <boost/circular_buffer.hpp>
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#include <gnuradio/block.h>
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#include <fstream>
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#include <string>
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class beidou_b1i_telemetry_decoder_cc;
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using beidou_b1i_telemetry_decoder_cc_sptr = boost::shared_ptr<beidou_b1i_telemetry_decoder_cc>;
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beidou_b1i_telemetry_decoder_cc_sptr beidou_b1i_make_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump);
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//!!!! edit
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/*!
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* \brief This class implements a block that decodes the GNAV data defined in BEIDOU ICD v5.1
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* \note Code added as part of GSoC 2018 program
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* \see <a href="http://russianspacesystems.ru/wp-content/uploads/2016/08/ICD_GLONASS_eng_v5.1.pdf">GLONASS ICD</a>
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*
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*/
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class beidou_b1i_telemetry_decoder_cc : public gr::block
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{
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public:
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~beidou_b1i_telemetry_decoder_cc(); //!< 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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/*!
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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 beidou_b1i_telemetry_decoder_cc_sptr
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beidou_b1i_make_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump);
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beidou_b1i_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump);
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void decode_subframe(double *symbols, int32_t frame_length);
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void decode_word(int32_t word_counter, const double *enc_word_symbols, int32_t *dec_word_symbols);
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void decode_bch15_11_01(const int32_t *bits, int32_t *decbits);
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// Preamble decoding
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uint16_t d_preambles_symbols[BEIDOU_DNAV_PREAMBLE_LENGTH_SYMBOLS];
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int32_t *d_preamble_samples;
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int32_t *d_secondary_code_symbols;
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uint32_t d_samples_per_symbol;
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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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double *d_subframe_symbols;
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uint32_t d_subframe_length_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_TOW_at_Preamble_ms;
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uint32_t d_TOW_at_current_symbol_ms;
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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
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