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https://github.com/gnss-sdr/gnss-sdr
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![Carles Fernandez](/assets/img/avatar_default.png)
GNSS-SDR.internal_fs_sps The old name was misleading, since the units are samples per second and not Hertz. Backward compatibility is kept, so this change does not break any existing configuration.
284 lines
7.9 KiB
C++
284 lines
7.9 KiB
C++
/*!
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* \file gps_l1_ca_pcps_opencl_acquisition.cc
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* \brief Adapts an OpenCL PCPS acquisition block to an
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* AcquisitionInterface for GPS L1 C/A signals
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* \author Marc Molina, 2013. marc.molina.pena(at)gmail.com
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*
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2015 (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_opencl_acquisition.h"
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#include <boost/math/distributions/exponential.hpp>
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#include <glog/logging.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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using google::LogMessage;
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GpsL1CaPcpsOpenClAcquisition::GpsL1CaPcpsOpenClAcquisition(
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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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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", 2048000);
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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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sampled_ms_ = configuration_->property(role + ".coherent_integration_time_ms", 1);
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bit_transition_flag_ = configuration_->property("Acquisition.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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//--- Find number of samples per spreading code -------------------------
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code_length_ = round(fs_in_
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/ (GPS_L1_CA_CODE_RATE_HZ / GPS_L1_CA_CODE_LENGTH_CHIPS));
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vector_length_ = code_length_ * sampled_ms_;
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code_ = new gr_complex[vector_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_make_opencl_acquisition_cc(sampled_ms_, max_dwells_,
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doppler_max_, if_, fs_in_, code_length_, code_length_,
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bit_transition_flag_, dump_, dump_filename_);
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stream_to_vector_ = gr::blocks::stream_to_vector::make(item_size_, vector_length_);
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DLOG(INFO) << "stream_to_vector(" << stream_to_vector_->unique_id() << ")";
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DLOG(INFO) << "acquisition(" << acquisition_cc_->unique_id() << ")";
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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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GpsL1CaPcpsOpenClAcquisition::~GpsL1CaPcpsOpenClAcquisition()
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{
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delete[] code_;
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}
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void GpsL1CaPcpsOpenClAcquisition::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 GpsL1CaPcpsOpenClAcquisition::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 GpsL1CaPcpsOpenClAcquisition::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 GpsL1CaPcpsOpenClAcquisition::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 GpsL1CaPcpsOpenClAcquisition::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 GpsL1CaPcpsOpenClAcquisition::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 GpsL1CaPcpsOpenClAcquisition::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 GpsL1CaPcpsOpenClAcquisition::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>[code_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*code_length_]), code,
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sizeof(gr_complex)*code_length_);
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}
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acquisition_cc_->set_local_code(code_);
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delete[] code;
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}
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}
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void GpsL1CaPcpsOpenClAcquisition::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 GpsL1CaPcpsOpenClAcquisition::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 = 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 = vector_length_ * frequency_bins;
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double exponent = 1 / static_cast<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 = static_cast<float>(quantile(mydist,val));
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return threshold;
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}
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void GpsL1CaPcpsOpenClAcquisition::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 GpsL1CaPcpsOpenClAcquisition::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 GpsL1CaPcpsOpenClAcquisition::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 GpsL1CaPcpsOpenClAcquisition::get_right_block()
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{
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return acquisition_cc_;
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}
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