mirror of https://github.com/gnss-sdr/gnss-sdr
278 lines
8.1 KiB
C++
278 lines
8.1 KiB
C++
/*!
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* \file galileo_e1_pcps_ambiguous_acquisition.cc
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* \brief Adapts a PCPS acquisition block to an AcquisitionInterface for
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* Galileo E1 Signals
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* \author Luis Esteve, 2012. luis(at)epsilon-formacion.com
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*
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* -----------------------------------------------------------------------------
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*
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* GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
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* This file is part of GNSS-SDR.
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*
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* Copyright (C) 2010-2020 (see AUTHORS file for a list of contributors)
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* SPDX-License-Identifier: GPL-3.0-or-later
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*
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* -----------------------------------------------------------------------------
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*/
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#include "galileo_e1_pcps_ambiguous_acquisition.h"
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#include "Galileo_E1.h"
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#include "acq_conf.h"
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#include "configuration_interface.h"
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#include "galileo_e1_signal_replica.h"
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#include "gnss_sdr_flags.h"
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#include <boost/math/distributions/exponential.hpp>
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#include <glog/logging.h>
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#include <algorithm>
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#if HAS_STD_SPAN
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#include <span>
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namespace own = std;
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#else
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#include <gsl/gsl>
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namespace own = gsl;
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#endif
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GalileoE1PcpsAmbiguousAcquisition::GalileoE1PcpsAmbiguousAcquisition(
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const ConfigurationInterface* configuration,
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const std::string& role,
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unsigned int in_streams,
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unsigned int out_streams) : role_(role),
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in_streams_(in_streams),
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out_streams_(out_streams)
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{
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configuration_ = configuration;
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acq_parameters_.ms_per_code = 4;
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acq_parameters_.SetFromConfiguration(configuration_, role, GALILEO_E1_CODE_CHIP_RATE_CPS, GALILEO_E1_OPT_ACQ_FS_SPS);
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DLOG(INFO) << "role " << role;
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if (FLAGS_doppler_max != 0)
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{
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acq_parameters_.doppler_max = FLAGS_doppler_max;
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}
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doppler_max_ = acq_parameters_.doppler_max;
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doppler_step_ = static_cast<unsigned int>(acq_parameters_.doppler_step);
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item_type_ = acq_parameters_.item_type;
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item_size_ = acq_parameters_.it_size;
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fs_in_ = acq_parameters_.fs_in;
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acquire_pilot_ = configuration->property(role + ".acquire_pilot", false);
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code_length_ = static_cast<unsigned int>(std::floor(static_cast<double>(acq_parameters_.resampled_fs) / (GALILEO_E1_CODE_CHIP_RATE_CPS / GALILEO_E1_B_CODE_LENGTH_CHIPS)));
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vector_length_ = static_cast<unsigned int>(std::floor(acq_parameters_.sampled_ms * acq_parameters_.samples_per_ms) * (acq_parameters_.bit_transition_flag ? 2.0 : 1.0));
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code_ = std::vector<std::complex<float>>(vector_length_);
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sampled_ms_ = acq_parameters_.sampled_ms;
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acquisition_ = pcps_make_acquisition(acq_parameters_);
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DLOG(INFO) << "acquisition(" << acquisition_->unique_id() << ")";
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if (item_type_ == "cbyte")
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{
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cbyte_to_float_x2_ = make_complex_byte_to_float_x2();
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float_to_complex_ = gr::blocks::float_to_complex::make();
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}
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channel_ = 0;
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threshold_ = 0.0;
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doppler_center_ = 0;
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gnss_synchro_ = nullptr;
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if (in_streams_ > 1)
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{
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LOG(ERROR) << "This implementation only supports one input stream";
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}
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if (out_streams_ > 0)
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{
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LOG(ERROR) << "This implementation does not provide an output stream";
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}
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}
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void GalileoE1PcpsAmbiguousAcquisition::stop_acquisition()
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{
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acquisition_->set_active(false);
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}
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void GalileoE1PcpsAmbiguousAcquisition::set_threshold(float threshold)
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{
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threshold_ = threshold;
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acquisition_->set_threshold(threshold_);
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}
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void GalileoE1PcpsAmbiguousAcquisition::set_doppler_max(unsigned int doppler_max)
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{
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doppler_max_ = doppler_max;
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acquisition_->set_doppler_max(doppler_max_);
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}
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void GalileoE1PcpsAmbiguousAcquisition::set_doppler_step(unsigned int doppler_step)
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{
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doppler_step_ = doppler_step;
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acquisition_->set_doppler_step(doppler_step_);
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}
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void GalileoE1PcpsAmbiguousAcquisition::set_doppler_center(int doppler_center)
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{
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doppler_center_ = doppler_center;
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acquisition_->set_doppler_center(doppler_center_);
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}
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void GalileoE1PcpsAmbiguousAcquisition::set_gnss_synchro(Gnss_Synchro* gnss_synchro)
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{
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gnss_synchro_ = gnss_synchro;
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acquisition_->set_gnss_synchro(gnss_synchro_);
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}
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signed int GalileoE1PcpsAmbiguousAcquisition::mag()
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{
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return acquisition_->mag();
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}
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void GalileoE1PcpsAmbiguousAcquisition::init()
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{
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acquisition_->init();
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}
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void GalileoE1PcpsAmbiguousAcquisition::set_local_code()
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{
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bool cboc = configuration_->property(
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"Acquisition" + std::to_string(channel_) + ".cboc", false);
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std::vector<std::complex<float>> code(code_length_);
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if (acquire_pilot_ == true)
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{
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// set local signal generator to Galileo E1 pilot component (1C)
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std::array<char, 3> pilot_signal = {{'1', 'C', '\0'}};
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if (acq_parameters_.use_automatic_resampler)
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{
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galileo_e1_code_gen_complex_sampled(code, pilot_signal,
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cboc, gnss_synchro_->PRN, acq_parameters_.resampled_fs, 0, false);
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}
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else
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{
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galileo_e1_code_gen_complex_sampled(code, pilot_signal,
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cboc, gnss_synchro_->PRN, fs_in_, 0, false);
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}
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}
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else
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{
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std::array<char, 3> Signal_{};
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Signal_[0] = gnss_synchro_->Signal[0];
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Signal_[1] = gnss_synchro_->Signal[1];
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Signal_[2] = '\0';
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if (acq_parameters_.use_automatic_resampler)
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{
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galileo_e1_code_gen_complex_sampled(code, Signal_,
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cboc, gnss_synchro_->PRN, acq_parameters_.resampled_fs, 0, false);
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}
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else
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{
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galileo_e1_code_gen_complex_sampled(code, Signal_,
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cboc, gnss_synchro_->PRN, fs_in_, 0, false);
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}
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}
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own::span<gr_complex> code_span(code_.data(), vector_length_);
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for (unsigned int i = 0; i < sampled_ms_ / 4; i++)
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{
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std::copy_n(code.data(), code_length_, code_span.subspan(i * code_length_, code_length_).data());
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}
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acquisition_->set_local_code(code_.data());
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}
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void GalileoE1PcpsAmbiguousAcquisition::reset()
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{
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acquisition_->set_active(true);
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}
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void GalileoE1PcpsAmbiguousAcquisition::set_state(int state)
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{
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acquisition_->set_state(state);
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}
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void GalileoE1PcpsAmbiguousAcquisition::connect(gr::top_block_sptr top_block)
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{
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if (item_type_ == "gr_complex" || item_type_ == "cshort")
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{
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// nothing to connect
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}
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else if (item_type_ == "cbyte")
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{
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// Since a byte-based acq implementation is not available,
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// we just convert cshorts to gr_complex
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top_block->connect(cbyte_to_float_x2_, 0, float_to_complex_, 0);
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top_block->connect(cbyte_to_float_x2_, 1, float_to_complex_, 1);
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top_block->connect(float_to_complex_, 0, acquisition_, 0);
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}
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else
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{
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LOG(WARNING) << item_type_ << " unknown acquisition item type";
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}
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}
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void GalileoE1PcpsAmbiguousAcquisition::disconnect(gr::top_block_sptr top_block)
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{
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if (item_type_ == "gr_complex" || item_type_ == "cshort")
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{
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// nothing to disconnect
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}
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else if (item_type_ == "cbyte")
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{
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top_block->disconnect(cbyte_to_float_x2_, 0, float_to_complex_, 0);
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top_block->disconnect(cbyte_to_float_x2_, 1, float_to_complex_, 1);
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top_block->disconnect(float_to_complex_, 0, acquisition_, 0);
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}
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else
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{
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LOG(WARNING) << item_type_ << " unknown acquisition item type";
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}
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}
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gr::basic_block_sptr GalileoE1PcpsAmbiguousAcquisition::get_left_block()
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{
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if (item_type_ == "gr_complex" || item_type_ == "cshort")
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{
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return acquisition_;
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}
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if (item_type_ == "cbyte")
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{
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return cbyte_to_float_x2_;
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}
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LOG(WARNING) << item_type_ << " unknown acquisition item type";
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return nullptr;
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}
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gr::basic_block_sptr GalileoE1PcpsAmbiguousAcquisition::get_right_block()
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{
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return acquisition_;
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}
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void GalileoE1PcpsAmbiguousAcquisition::set_resampler_latency(uint32_t latency_samples)
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{
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acquisition_->set_resampler_latency(latency_samples);
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}
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