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https://github.com/gnss-sdr/gnss-sdr
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b0d33328d5
decoding: Changes in the flowgraph and in the configuration files to mix channels from different GNSS systems in the same receiver. Hybrid observables and PVT under construction. The changes in the configuration file parameter names are NOT backward compatible. The receiver can still work as usual in single GNSS system mode but some modification on configuration files are required. Use the example provided of Hybrid configuration file.
153 lines
5.3 KiB
C++
153 lines
5.3 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 decimation factor to average the GPS synchronization estimation output from the tracking module.
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*/
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void set_decimation(int decimation);
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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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// 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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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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