mirror of https://github.com/gnss-sdr/gnss-sdr
332 lines
11 KiB
C++
332 lines
11 KiB
C++
/*!
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* \file galileo_e1_pcps_quicksync_ambiguous_acquisition.cc
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* \brief Adapts a PCPS acquisition block to an AcquisitionInterface for
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* Galileo E1 Signals using the QuickSync Algorithm
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* \author Damian Miralles, 2014. dmiralles2009@gmail.com
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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 "galileo_e1_pcps_quicksync_ambiguous_acquisition.h"
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#include <boost/lexical_cast.hpp>
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#include <boost/math/distributions/exponential.hpp>
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#include <glog/logging.h>
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#include "galileo_e1_signal_processing.h"
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#include "Galileo_E1.h"
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#include "configuration_interface.h"
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#include "gnss_sdr_flags.h"
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using google::LogMessage;
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GalileoE1PcpsQuickSyncAmbiguousAcquisition::GalileoE1PcpsQuickSyncAmbiguousAcquisition(
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ConfigurationInterface* configuration, std::string role,
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unsigned int in_streams, unsigned int out_streams) : role_(role), in_streams_(in_streams), out_streams_(out_streams)
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{
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configuration_ = configuration;
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std::string default_item_type = "gr_complex";
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std::string default_dump_filename = "../data/acquisition.dat";
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DLOG(INFO) << "role " << role;
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item_type_ = configuration_->property(role + ".item_type",
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default_item_type);
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long fs_in_deprecated = configuration_->property("GNSS-SDR.internal_fs_hz", 4000000);
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fs_in_ = configuration_->property("GNSS-SDR.internal_fs_sps", fs_in_deprecated);
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if_ = configuration_->property(role + ".if", 0);
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dump_ = configuration_->property(role + ".dump", false);
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doppler_max_ = configuration_->property(role + ".doppler_max", 5000);
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if (FLAGS_doppler_max != 0) doppler_max_ = FLAGS_doppler_max;
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sampled_ms_ = configuration_->property(role + ".coherent_integration_time_ms", 8);
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/*--- Find number of samples per spreading code (4 ms) -----------------*/
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code_length_ = round(
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fs_in_ / (Galileo_E1_CODE_CHIP_RATE_HZ / Galileo_E1_B_CODE_LENGTH_CHIPS));
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int samples_per_ms = round(code_length_ / 4.0);
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/*Calculate the folding factor value based on the formula described in the paper.
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This may be a bug, but acquisition also work by variying the folding factor at va-
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lues different that the expressed in the paper. In adition, it is important to point
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out that by making the folding factor smaller we were able to get QuickSync work with
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Galileo. Future work should be directed to test this asumption statistically.*/
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//folding_factor_ = static_cast<unsigned int>(ceil(sqrt(log2(code_length_))));
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folding_factor_ = configuration_->property(role + ".folding_factor", 2);
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if (sampled_ms_ % (folding_factor_ * 4) != 0)
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{
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LOG(WARNING) << "QuickSync Algorithm requires a coherent_integration_time"
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<< " multiple of " << (folding_factor_ * 4) << "ms, Value entered "
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<< sampled_ms_ << " ms";
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if (sampled_ms_ < (folding_factor_ * 4))
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{
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sampled_ms_ = static_cast<int>(folding_factor_ * 4);
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}
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else
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{
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sampled_ms_ = static_cast<int>(sampled_ms_ / (folding_factor_ * 4)) * (folding_factor_ * 4);
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}
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LOG(WARNING) << "coherent_integration_time should be multiple of "
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<< "Galileo code length (4 ms). coherent_integration_time = "
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<< sampled_ms_ << " ms will be used.";
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}
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// vector_length_ = (sampled_ms_/folding_factor_) * code_length_;
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vector_length_ = sampled_ms_ * samples_per_ms;
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bit_transition_flag_ = configuration_->property(role + ".bit_transition_flag", false);
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if (!bit_transition_flag_)
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{
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max_dwells_ = configuration_->property(role + ".max_dwells", 1);
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}
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else
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{
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max_dwells_ = 2;
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}
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dump_filename_ = configuration_->property(role + ".dump_filename",
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default_dump_filename);
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code_ = new gr_complex[code_length_];
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LOG(INFO) << "Vector Length: " << vector_length_
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<< ", Samples per ms: " << samples_per_ms
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<< ", Folding factor: " << folding_factor_
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<< ", Sampled ms: " << sampled_ms_
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<< ", Code Length: " << code_length_;
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if (item_type_.compare("gr_complex") == 0)
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{
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item_size_ = sizeof(gr_complex);
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acquisition_cc_ = pcps_quicksync_make_acquisition_cc(folding_factor_,
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sampled_ms_, max_dwells_, doppler_max_, if_, fs_in_,
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samples_per_ms, code_length_, bit_transition_flag_,
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dump_, dump_filename_);
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stream_to_vector_ = gr::blocks::stream_to_vector::make(item_size_,
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vector_length_);
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DLOG(INFO) << "stream_to_vector_quicksync("
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<< stream_to_vector_->unique_id() << ")";
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DLOG(INFO) << "acquisition_quicksync(" << acquisition_cc_->unique_id()
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<< ")";
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}
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else
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{
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item_size_ = sizeof(gr_complex);
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LOG(WARNING) << item_type_ << " unknown acquisition item type";
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}
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channel_ = 0;
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threshold_ = 0.0;
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doppler_step_ = 0;
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gnss_synchro_ = 0;
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}
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GalileoE1PcpsQuickSyncAmbiguousAcquisition::~GalileoE1PcpsQuickSyncAmbiguousAcquisition()
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{
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delete[] code_;
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}
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void GalileoE1PcpsQuickSyncAmbiguousAcquisition::set_channel(unsigned int channel)
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{
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channel_ = channel;
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if (item_type_.compare("gr_complex") == 0)
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{
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acquisition_cc_->set_channel(channel_);
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}
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}
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void GalileoE1PcpsQuickSyncAmbiguousAcquisition::set_threshold(float threshold)
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{
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float pfa = configuration_->property(role_ + boost::lexical_cast<std::string>(channel_) + ".pfa", 0.0);
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if (pfa == 0.0) pfa = configuration_->property(role_ + ".pfa", 0.0);
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if (pfa == 0.0)
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{
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threshold_ = threshold;
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}
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else
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{
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threshold_ = calculate_threshold(pfa);
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}
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DLOG(INFO) << "Channel " << channel_ << " Threshold = " << threshold_;
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if (item_type_.compare("gr_complex") == 0)
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{
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acquisition_cc_->set_threshold(threshold_);
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}
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}
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void GalileoE1PcpsQuickSyncAmbiguousAcquisition::set_doppler_max(unsigned int doppler_max)
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{
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doppler_max_ = doppler_max;
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if (item_type_.compare("gr_complex") == 0)
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{
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acquisition_cc_->set_doppler_max(doppler_max_);
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}
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}
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void GalileoE1PcpsQuickSyncAmbiguousAcquisition::set_doppler_step(unsigned int doppler_step)
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{
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doppler_step_ = doppler_step;
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if (item_type_.compare("gr_complex") == 0)
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{
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acquisition_cc_->set_doppler_step(doppler_step_);
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}
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}
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void GalileoE1PcpsQuickSyncAmbiguousAcquisition::set_gnss_synchro(
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Gnss_Synchro* gnss_synchro)
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{
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gnss_synchro_ = gnss_synchro;
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if (item_type_.compare("gr_complex") == 0)
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{
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acquisition_cc_->set_gnss_synchro(gnss_synchro_);
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}
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}
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signed int
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GalileoE1PcpsQuickSyncAmbiguousAcquisition::mag()
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{
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if (item_type_.compare("gr_complex") == 0)
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{
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return acquisition_cc_->mag();
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}
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else
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{
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return 0;
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}
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}
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void GalileoE1PcpsQuickSyncAmbiguousAcquisition::init()
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{
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acquisition_cc_->init();
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//set_local_code();
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}
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void GalileoE1PcpsQuickSyncAmbiguousAcquisition::set_local_code()
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{
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if (item_type_.compare("gr_complex") == 0)
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{
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bool cboc = configuration_->property(
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"Acquisition" + boost::lexical_cast<std::string>(channel_) + ".cboc", false);
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std::complex<float>* code = new std::complex<float>[code_length_];
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galileo_e1_code_gen_complex_sampled(code, gnss_synchro_->Signal,
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cboc, gnss_synchro_->PRN, fs_in_, 0, false);
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for (unsigned int i = 0; i < (sampled_ms_ / (folding_factor_ * 4)); i++)
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{
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memcpy(&(code_[i * code_length_]), code,
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sizeof(gr_complex) * code_length_);
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}
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// memcpy(code_, code,sizeof(gr_complex)*code_length_);
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acquisition_cc_->set_local_code(code_);
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delete[] code;
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code = NULL;
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}
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}
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void GalileoE1PcpsQuickSyncAmbiguousAcquisition::reset()
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{
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if (item_type_.compare("gr_complex") == 0)
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{
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acquisition_cc_->set_active(true);
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}
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}
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void GalileoE1PcpsQuickSyncAmbiguousAcquisition::set_state(int state)
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{
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if (item_type_.compare("gr_complex") == 0)
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{
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acquisition_cc_->set_state(state);
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}
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}
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float GalileoE1PcpsQuickSyncAmbiguousAcquisition::calculate_threshold(float pfa)
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{
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unsigned int frequency_bins = 0;
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for (int doppler = static_cast<int>(-doppler_max_); doppler <= static_cast<int>(doppler_max_); doppler += doppler_step_)
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{
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frequency_bins++;
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}
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DLOG(INFO) << "Channel " << channel_ << " Pfa = " << pfa;
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unsigned int ncells = code_length_ / folding_factor_ * frequency_bins;
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double exponent = 1.0 / static_cast<double>(ncells);
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double val = pow(1.0 - pfa, exponent);
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double lambda = static_cast<double>(code_length_) / static_cast<double>(folding_factor_);
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boost::math::exponential_distribution<double> mydist(lambda);
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float threshold = static_cast<float>(quantile(mydist, val));
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return threshold;
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}
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void GalileoE1PcpsQuickSyncAmbiguousAcquisition::connect(gr::top_block_sptr top_block)
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{
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if (item_type_.compare("gr_complex") == 0)
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{
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top_block->connect(stream_to_vector_, 0, acquisition_cc_, 0);
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}
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}
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void GalileoE1PcpsQuickSyncAmbiguousAcquisition::disconnect(gr::top_block_sptr top_block)
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{
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if (item_type_.compare("gr_complex") == 0)
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{
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top_block->disconnect(stream_to_vector_, 0, acquisition_cc_, 0);
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}
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}
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gr::basic_block_sptr GalileoE1PcpsQuickSyncAmbiguousAcquisition::get_left_block()
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{
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return stream_to_vector_;
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}
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gr::basic_block_sptr GalileoE1PcpsQuickSyncAmbiguousAcquisition::get_right_block()
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{
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return acquisition_cc_;
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}
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