mirror of https://github.com/gnss-sdr/gnss-sdr
282 lines
7.5 KiB
C++
282 lines
7.5 KiB
C++
/*!
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* \file gps_l1_ca_pcps_acquisition.cc
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* \brief Adapts a PCPS acquisition block to an AcquisitionInterface for
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* GPS L1 C/A Signals
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* \authors <ul>
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* <li> Javier Arribas, 2011. jarribas(at)cttc.es
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* <li> Luis Esteve, 2012. luis(at)epsilon-formacion.com
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* </ul>
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*
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2012 (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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#include "gps_l1_ca_pcps_acquisition.h"
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#include "gps_sdr_signal_processing.h"
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#include "GPS_L1_CA.h"
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#include "configuration_interface.h"
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#include <iostream>
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#include <glog/log_severity.h>
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#include <glog/logging.h>
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#include <stdexcept>
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#include <boost/math/distributions/exponential.hpp>
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#include <gnuradio/msg_queue.h>
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using google::LogMessage;
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GpsL1CaPcpsAcquisition::GpsL1CaPcpsAcquisition(
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ConfigurationInterface* configuration, std::string role,
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unsigned int in_streams, unsigned int out_streams,
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gr::msg_queue::sptr queue) :
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role_(role), in_streams_(in_streams), out_streams_(out_streams), queue_(queue)
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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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// std::cout << "role " << role_ << std::endl;
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item_type_ = configuration_->property(role + ".item_type",
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default_item_type);
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fs_in_ = configuration_->property("GNSS-SDR.internal_fs_hz", 2048000);
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if_ = configuration_->property(role + ".ifreq", 0);
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dump_ = configuration_->property(role + ".dump", false);
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shift_resolution_ = configuration_->property(role + ".doppler_max", 10000);
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sampled_ms_ = configuration_->property(role + ".sampled_ms", 1);
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dump_filename_ = configuration_->property(role + ".dump_filename",
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default_dump_filename);
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//--- Find number of samples per spreading code -------------------------
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vector_length_ = round(fs_in_
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/ (GPS_L1_CA_CODE_RATE_HZ / GPS_L1_CA_CODE_LENGTH_CHIPS));
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code_= new gr_complex[vector_length_ * sampled_ms_];
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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_make_acquisition_cc(sampled_ms_,
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shift_resolution_, if_, fs_in_, vector_length_, vector_length_, queue_,
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dump_, dump_filename_);
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stream_to_vector_ = gr::blocks::stream_to_vector::make(item_size_, vector_length_*sampled_ms_);
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DLOG(INFO) << "stream_to_vector(" << stream_to_vector_->unique_id()
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<< ")";
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DLOG(INFO) << "acquisition(" << 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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LOG_AT_LEVEL(WARNING) << item_type_
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<< " unknown acquisition item type";
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}
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}
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GpsL1CaPcpsAcquisition::~GpsL1CaPcpsAcquisition()
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{
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delete[] code_;
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}
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void GpsL1CaPcpsAcquisition::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 GpsL1CaPcpsAcquisition::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)
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{
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pfa = configuration_->property(role_+".pfa", 0.0);
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}
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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 GpsL1CaPcpsAcquisition::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 GpsL1CaPcpsAcquisition::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 GpsL1CaPcpsAcquisition::set_channel_queue(
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concurrent_queue<int> *channel_internal_queue)
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{
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channel_internal_queue_ = channel_internal_queue;
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if (item_type_.compare("gr_complex") == 0)
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{
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acquisition_cc_->set_channel_queue(channel_internal_queue_);
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}
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}
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void GpsL1CaPcpsAcquisition::set_gnss_synchro(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 GpsL1CaPcpsAcquisition::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 GpsL1CaPcpsAcquisition::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 GpsL1CaPcpsAcquisition::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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std::complex<float>* code = new std::complex<float>[vector_length_];
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gps_l1_ca_code_gen_complex_sampled(code, gnss_synchro_->PRN, fs_in_, 0);
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for (unsigned int i = 0; i < sampled_ms_; i++)
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{
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memcpy(&(code_[i*vector_length_]), code,
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sizeof(gr_complex)*vector_length_);
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}
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acquisition_cc_->set_local_code(code_);
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}
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}
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void GpsL1CaPcpsAcquisition::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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float GpsL1CaPcpsAcquisition::calculate_threshold(float pfa)
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{
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//Calculate the threshold
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unsigned int frequency_bins = 0;
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for (int doppler = (int)(-doppler_max_); doppler <= (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 = vector_length_*frequency_bins;
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double exponent = 1/(double)ncells;
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double val = pow(1.0-pfa,exponent);
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double lambda = double(vector_length_);
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boost::math::exponential_distribution<double> mydist (lambda);
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float threshold = (float)quantile(mydist,val);
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return threshold;
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}
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void GpsL1CaPcpsAcquisition::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 GpsL1CaPcpsAcquisition::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 GpsL1CaPcpsAcquisition::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 GpsL1CaPcpsAcquisition::get_right_block()
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{
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return acquisition_cc_;
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}
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