mirror of https://github.com/gnss-sdr/gnss-sdr
120 lines
4.5 KiB
C++
120 lines
4.5 KiB
C++
/*!
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* \file glonass_l1_ca_telemetry_decoder_cc.h
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* \brief Implementation of an adapter of a GLONASS L1 C/A NAV data decoder block
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* to a TelemetryDecoderInterface
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* \note Code added as part of GSoC 2017 program
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* \author Damian Miralles, 2017. dmiralles2009(at)gmail.com
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*
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2018 (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_GLONASS_L1_CA_TELEMETRY_DECODER_CC_H
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#define GNSS_SDR_GLONASS_L1_CA_TELEMETRY_DECODER_CC_H
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#include "GLONASS_L1_L2_CA.h"
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#include "glonass_gnav_almanac.h"
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#include "glonass_gnav_ephemeris.h"
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#include "glonass_gnav_navigation_message.h"
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#include "glonass_gnav_utc_model.h"
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#include "gnss_satellite.h"
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#include "gnss_synchro.h"
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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 glonass_l1_ca_telemetry_decoder_cc;
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typedef boost::shared_ptr<glonass_l1_ca_telemetry_decoder_cc> glonass_l1_ca_telemetry_decoder_cc_sptr;
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glonass_l1_ca_telemetry_decoder_cc_sptr glonass_l1_ca_make_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump);
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/*!
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* \brief This class implements a block that decodes the GNAV data defined in GLONASS ICD v5.1
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* \note Code added as part of GSoC 2017 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 glonass_l1_ca_telemetry_decoder_cc : public gr::block
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{
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public:
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~glonass_l1_ca_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(int32_t 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 glonass_l1_ca_telemetry_decoder_cc_sptr
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glonass_l1_ca_make_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump);
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glonass_l1_ca_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump);
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void decode_string(const double *symbols, int32_t frame_length);
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//!< Help with coherent tracking
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double d_preamble_time_samples;
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//!< Preamble decoding
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uint16_t d_preambles_bits[GLONASS_GNAV_PREAMBLE_LENGTH_BITS]{};
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int32_t *d_preambles_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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//!< Storage for incoming data
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std::deque<Gnss_Synchro> 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_parity; //!< Flag indicating when parity check was achieved (crc check)
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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_TOW_set; //!< Indicates when time of week is set
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double delta_t; //!< GPS-GLONASS time offset
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//!< Navigation Message variable
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Glonass_Gnav_Navigation_Message d_nav;
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//!< Values to populate gnss synchronization structure
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double d_TOW_at_current_symbol;
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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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