mirror of https://github.com/gnss-sdr/gnss-sdr
126 lines
3.8 KiB
C++
126 lines
3.8 KiB
C++
/*!
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* \file gps_l1_ca_telemetry_decoder_cc.h
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* \brief Interface of a NAV message demodulator block based on
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* Kay Borre book MATLAB-based GPS receiver
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* \author Javier Arribas, 2011. jarribas(at)cttc.es
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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_GPS_L1_CA_TELEMETRY_DECODER_CC_H
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#define GNSS_SDR_GPS_L1_CA_TELEMETRY_DECODER_CC_H
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#include "GPS_L1_CA.h"
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#include "gps_l1_ca_subframe_fsm.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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#include <boost/circular_buffer.hpp>
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class gps_l1_ca_telemetry_decoder_cc;
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typedef boost::shared_ptr<gps_l1_ca_telemetry_decoder_cc> gps_l1_ca_telemetry_decoder_cc_sptr;
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gps_l1_ca_telemetry_decoder_cc_sptr
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gps_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 NAV data defined in IS-GPS-200E
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*
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*/
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class gps_l1_ca_telemetry_decoder_cc : public gr::block
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{
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public:
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~gps_l1_ca_telemetry_decoder_cc();
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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 gps_l1_ca_telemetry_decoder_cc_sptr
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gps_l1_ca_make_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump);
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gps_l1_ca_telemetry_decoder_cc(const Gnss_Satellite &satellite, bool dump);
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bool gps_word_parityCheck(unsigned int gpsword);
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// class private vars
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int *d_preambles_symbols;
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unsigned int d_stat;
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bool d_flag_frame_sync;
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// symbols
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boost::circular_buffer<Gnss_Synchro> d_symbol_history;
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double d_symbol_accumulator;
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short int d_symbol_accumulator_counter;
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// symbol counting
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bool d_make_correlation;
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unsigned int d_symbol_counter_corr;
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//bits and frame
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unsigned short int d_frame_bit_index;
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unsigned int d_GPS_frame_4bytes;
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unsigned int d_prev_GPS_frame_4bytes;
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bool d_flag_parity;
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bool d_flag_preamble;
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bool d_flag_new_tow_available;
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int d_word_number;
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// output averaging and decimation
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int d_average_count;
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int d_decimation_output_factor;
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// navigation message vars
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Gps_Navigation_Message d_nav;
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GpsL1CaSubframeFsm d_GPS_FSM;
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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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unsigned long int d_preamble_time_samples;
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double d_TOW_at_Preamble;
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double d_TOW_at_current_symbol;
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unsigned int d_TOW_at_current_symbol_ms;
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bool flag_TOW_set;
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bool flag_PLL_180_deg_phase_locked;
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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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