mirror of https://github.com/gnss-sdr/gnss-sdr
204 lines
7.5 KiB
C++
204 lines
7.5 KiB
C++
/*!
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* \file signal_generator.cc
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* \brief Adapter of a class that generates synthesized GNSS signal.
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* \author Marc Molina, 2013. marc.molina.pena@gmail.com
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*
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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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#include "signal_generator.h"
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#include "Beidou_B1I.h"
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#include "GLONASS_L1_L2_CA.h"
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#include "GPS_L1_CA.h"
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#include "Galileo_E1.h"
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#include "Galileo_E5a.h"
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#include "configuration_interface.h"
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#include <glog/logging.h>
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#include <cstdint>
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#include <utility>
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using google::LogMessage;
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SignalGenerator::SignalGenerator(ConfigurationInterface* configuration,
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const std::string& role, unsigned int in_stream,
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unsigned int out_stream, boost::shared_ptr<gr::msg_queue> queue) : role_(role), in_stream_(in_stream), out_stream_(out_stream), queue_(std::move(queue))
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{
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std::string default_item_type = "gr_complex";
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std::string default_dump_file = "./data/gen_source.dat";
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std::string default_system = "G";
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std::string default_signal = "1C";
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item_type_ = configuration->property(role + ".item_type", default_item_type);
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dump_ = configuration->property(role + ".dump", false);
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dump_filename_ = configuration->property(role + ".dump_filename", default_dump_file);
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unsigned int fs_in = configuration->property("SignalSource.fs_hz", 4e6);
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bool data_flag = configuration->property("SignalSource.data_flag", false);
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bool noise_flag = configuration->property("SignalSource.noise_flag", false);
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float BW_BB = configuration->property("SignalSource.BW_BB", 1.0);
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unsigned int num_satellites = configuration->property("SignalSource.num_satellites", 1);
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std::vector<std::string> signal1;
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std::vector<std::string> system;
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std::vector<unsigned int> PRN;
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std::vector<float> CN0_dB;
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std::vector<float> doppler_Hz;
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std::vector<unsigned int> delay_chips;
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std::vector<unsigned int> delay_sec;
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for (unsigned int sat_idx = 0; sat_idx < num_satellites; sat_idx++)
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{
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std::string sat = std::to_string(sat_idx);
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signal1.push_back(configuration->property("SignalSource.signal_" + sat, default_signal));
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system.push_back(configuration->property("SignalSource.system_" + sat, default_system));
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PRN.push_back(configuration->property("SignalSource.PRN_" + sat, 1));
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CN0_dB.push_back(configuration->property("SignalSource.CN0_dB_" + sat, 10));
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doppler_Hz.push_back(configuration->property("SignalSource.doppler_Hz_" + sat, 0));
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delay_chips.push_back(configuration->property("SignalSource.delay_chips_" + sat, 0));
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delay_sec.push_back(configuration->property("SignalSource.delay_sec_" + sat, 0));
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}
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// If Galileo signal is present -> vector duration = 100 ms (25 * 4 ms)
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// If there is only GPS signal (Galileo signal not present) -> vector duration = 1 ms
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unsigned int vector_length = 0;
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if (std::find(system.begin(), system.end(), "E") != system.end())
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{
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if (signal1[0].at(0) == '5')
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{
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vector_length = round(static_cast<float>(fs_in) / (GALILEO_E5A_CODE_CHIP_RATE_HZ / GALILEO_E5A_CODE_LENGTH_CHIPS));
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}
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else
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{
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vector_length = round(static_cast<float>(fs_in) / (GALILEO_E1_CODE_CHIP_RATE_HZ / GALILEO_E1_B_CODE_LENGTH_CHIPS)) * GALILEO_E1_C_SECONDARY_CODE_LENGTH;
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}
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}
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else if (std::find(system.begin(), system.end(), "G") != system.end())
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{
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vector_length = round(static_cast<float>(fs_in) / (GPS_L1_CA_CODE_RATE_HZ / GPS_L1_CA_CODE_LENGTH_CHIPS));
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}
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else if (std::find(system.begin(), system.end(), "R") != system.end())
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{
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if (signal1[0].at(0) == '1')
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{
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vector_length = round(static_cast<float>(fs_in) / (GLONASS_L1_CA_CODE_RATE_HZ / GLONASS_L1_CA_CODE_LENGTH_CHIPS));
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}
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else
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{
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vector_length = round(static_cast<float>(fs_in) / (GLONASS_L2_CA_CODE_RATE_HZ / GLONASS_L2_CA_CODE_LENGTH_CHIPS));
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}
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}
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else if (std::find(system.begin(), system.end(), "B") != system.end())
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{
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vector_length = round(static_cast<float>(fs_in) / (BEIDOU_B1I_CODE_RATE_HZ / BEIDOU_B1I_CODE_LENGTH_CHIPS));
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}
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if (item_type_ == "gr_complex")
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{
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item_size_ = sizeof(gr_complex);
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DLOG(INFO) << "Item size " << item_size_;
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gen_source_ = signal_make_generator_c(signal1, system, PRN, CN0_dB, doppler_Hz, delay_chips, delay_sec,
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data_flag, noise_flag, fs_in, vector_length, BW_BB);
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vector_to_stream_ = gr::blocks::vector_to_stream::make(item_size_, vector_length);
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DLOG(INFO) << "vector_to_stream(" << vector_to_stream_->unique_id() << ")";
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DLOG(INFO) << "gen_source(" << gen_source_->unique_id() << ")";
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}
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else
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{
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LOG(WARNING) << item_type_ << " unrecognized item type for resampler";
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item_size_ = sizeof(int16_t);
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}
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if (dump_)
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{
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DLOG(INFO) << "Dumping output into file " << dump_filename_;
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file_sink_ = gr::blocks::file_sink::make(item_size_, dump_filename_.c_str());
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}
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if (dump_)
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{
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DLOG(INFO) << "file_sink(" << file_sink_->unique_id() << ")";
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}
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if (in_stream_ > 0)
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{
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LOG(ERROR) << "A signal source does not have an input stream";
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}
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if (out_stream_ > 1)
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{
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LOG(ERROR) << "This implementation only supports one output stream";
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}
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}
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SignalGenerator::~SignalGenerator() = default;
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void SignalGenerator::connect(gr::top_block_sptr top_block)
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{
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if (item_type_ == "gr_complex")
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{
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top_block->connect(gen_source_, 0, vector_to_stream_, 0);
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DLOG(INFO) << "connected gen_source to vector_to_stream";
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if (dump_)
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{
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top_block->connect(vector_to_stream_, 0, file_sink_, 0);
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DLOG(INFO) << "connected vector_to_stream_ to file sink";
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}
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}
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}
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void SignalGenerator::disconnect(gr::top_block_sptr top_block)
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{
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if (item_type_ == "gr_complex")
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{
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top_block->disconnect(gen_source_, 0, vector_to_stream_, 0);
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if (dump_)
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{
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top_block->disconnect(vector_to_stream_, 0, file_sink_, 0);
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}
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}
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}
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gr::basic_block_sptr SignalGenerator::get_left_block()
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{
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LOG(WARNING) << "Left block of a signal source should not be retrieved";
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return gr::block_sptr();
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}
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gr::basic_block_sptr SignalGenerator::get_right_block()
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{
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return vector_to_stream_;
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}
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