mirror of https://github.com/gnss-sdr/gnss-sdr
146 lines
5.2 KiB
C++
146 lines
5.2 KiB
C++
/*!
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* \file galileo_e5a_telemetry_decoder_cc.cc
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* \brief Implementation of a Galileo FNAV message demodulator block
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* \author Marc Sales, 2014. marcsales92(at)gmail.com
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* \based on work from:
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* <ul>
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* <li> Javier Arribas, 2011. jarribas(at)cttc.es
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* </ul>
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*
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*
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2015 (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 <http://www.gnu.org/licenses/>.
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*
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* -------------------------------------------------------------------------
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*/
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#ifndef GNSS_SDR_GALILEO_E5A_TELEMETRY_DECODER_CC_H_
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#define GNSS_SDR_GALILEO_E5A_TELEMETRY_DECODER_CC_H_
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#include <fstream>
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#include <string>
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#include <gnuradio/block.h>
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#include <gnuradio/msg_queue.h>
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#include "Galileo_E5a.h"
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#include "concurrent_queue.h"
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#include "gnss_satellite.h"
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#include "galileo_fnav_message.h"
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#include "galileo_ephemeris.h"
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#include "galileo_almanac.h"
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#include "galileo_iono.h"
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#include "galileo_utc_model.h"
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//#include "convolutional.h"
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class galileo_e5a_telemetry_decoder_cc;
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typedef boost::shared_ptr<galileo_e5a_telemetry_decoder_cc> galileo_e5a_telemetry_decoder_cc_sptr;
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galileo_e5a_telemetry_decoder_cc_sptr galileo_e5a_make_telemetry_decoder_cc(Gnss_Satellite satellite, boost::shared_ptr<gr::msg_queue> queue, bool dump);
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/*!
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* \brief This class implements a block that decodes the FNAV data defined in Galileo ICD
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*
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*/
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class galileo_e5a_telemetry_decoder_cc : public gr::block
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{
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public:
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~galileo_e5a_telemetry_decoder_cc();
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void set_satellite(Gnss_Satellite satellite); //!< Set satellite PRN
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void set_channel(int channel); //!< Set receiver's channel
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void set_ephemeris_queue(concurrent_queue<Galileo_Ephemeris> *ephemeris_queue); //!< Set the satellite data queue
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void set_iono_queue(concurrent_queue<Galileo_Iono> *iono_queue); //!< Set the iono data queue
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void set_almanac_queue(concurrent_queue<Galileo_Almanac> *almanac_queue); //!< Set the almanac data queue
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void set_utc_model_queue(concurrent_queue<Galileo_Utc_Model> *utc_model_queue); //!< Set the UTC model queue
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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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/*!
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* \brief Function which tells the scheduler how many input items
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* are required to produce noutput_items output items.
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*/
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void forecast (int noutput_items, gr_vector_int &ninput_items_required);
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private:
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friend galileo_e5a_telemetry_decoder_cc_sptr
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galileo_e5a_make_telemetry_decoder_cc(Gnss_Satellite satellite, boost::shared_ptr<gr::msg_queue> queue, bool dump);
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galileo_e5a_telemetry_decoder_cc(Gnss_Satellite satellite, boost::shared_ptr<gr::msg_queue> queue, bool dump);
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void viterbi_decoder(double *page_part_symbols, int *page_part_bits);
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void deinterleaver(int rows, int cols, double *in, double *out);
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void decode_word(double *page_symbols,int frame_length);
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int d_preamble_bits[GALILEO_FNAV_PREAMBLE_LENGTH_BITS];
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// signed int d_page_symbols[GALILEO_FNAV_SYMBOLS_PER_PAGE + GALILEO_FNAV_PREAMBLE_LENGTH_BITS];
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double d_page_symbols[GALILEO_FNAV_SYMBOLS_PER_PAGE + GALILEO_FNAV_PREAMBLE_LENGTH_BITS];
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// signed int *d_preamble_symbols;
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double d_current_symbol;
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long unsigned int d_symbol_counter;
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int d_prompt_counter;
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int d_sign_init;
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long unsigned int d_sample_counter;
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long unsigned int d_preamble_index;
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bool d_preamble_lock;
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bool d_flag_frame_sync;
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int d_state;
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bool d_flag_preamble;
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int d_CRC_error_counter;
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// navigation message vars
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Galileo_Fnav_Message d_nav;
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// Galileo ephemeris queue
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concurrent_queue<Galileo_Ephemeris> *d_ephemeris_queue;
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// ionospheric parameters queue
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concurrent_queue<Galileo_Iono> *d_iono_queue;
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// UTC model parameters queue
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concurrent_queue<Galileo_Utc_Model> *d_utc_model_queue;
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// Almanac queue
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concurrent_queue<Galileo_Almanac> *d_almanac_queue;
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boost::shared_ptr<gr::msg_queue> d_queue;
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bool d_dump;
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Gnss_Satellite d_satellite;
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int d_channel;
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double d_preamble_time_seconds;
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double d_TOW_at_Preamble;
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double d_TOW_at_current_symbol;
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double Prn_timestamp_at_preamble_ms;
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bool flag_TOW_set;
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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_GALILEO_E5A_TELEMETRY_DECODER_CC_H_ */
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