mirror of https://github.com/gnss-sdr/gnss-sdr
143 lines
5.0 KiB
C++
143 lines
5.0 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) 2010-2014 (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_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 <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 "GPS_L1_CA.h"
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#include "gps_l1_ca_subframe_fsm.h"
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#include "concurrent_queue.h"
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#include "gnss_satellite.h"
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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(Gnss_Satellite satellite, long if_freq, long fs_in, unsigned
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int vector_length, 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 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(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 Set the satellite data queue
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*/
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void set_ephemeris_queue(concurrent_queue<Gps_Ephemeris> *ephemeris_queue){d_GPS_FSM.d_ephemeris_queue = ephemeris_queue;} //!< Set the ephemeris data queue
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void set_iono_queue(concurrent_queue<Gps_Iono> *iono_queue){d_GPS_FSM.d_iono_queue = iono_queue;} //!< Set the iono data queue
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void set_almanac_queue(concurrent_queue<Gps_Almanac> *almanac_queue){d_GPS_FSM.d_almanac_queue = almanac_queue;} //!< Set the almanac data queue
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void set_utc_model_queue(concurrent_queue<Gps_Utc_Model> *utc_model_queue){d_GPS_FSM.d_utc_model_queue = utc_model_queue;} //!< Set the UTC model data 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 gps_l1_ca_telemetry_decoder_cc_sptr
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gps_l1_ca_make_telemetry_decoder_cc(Gnss_Satellite satellite, long if_freq, long fs_in,unsigned
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int vector_length, boost::shared_ptr<gr::msg_queue> queue, bool dump);
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gps_l1_ca_telemetry_decoder_cc(Gnss_Satellite satellite, long if_freq, long fs_in, unsigned
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int vector_length, boost::shared_ptr<gr::msg_queue> queue, bool dump);
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bool gps_word_parityCheck(unsigned int gpsword);
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// constants
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unsigned short int d_preambles_bits[GPS_CA_PREAMBLE_LENGTH_BITS];
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// class private vars
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signed int *d_preambles_symbols;
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unsigned int d_samples_per_bit;
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long unsigned int d_sample_counter;
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long unsigned int d_preamble_index;
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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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double d_symbol_accumulator;
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short int d_symbol_accumulator_counter;
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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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int d_word_number;
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long d_fs_in;
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//double d_preamble_duration_seconds;
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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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boost::shared_ptr<gr::msg_queue> d_queue;
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unsigned int d_vector_length;
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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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//std::deque<double> d_prn_start_sample_history;
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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
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