mirror of https://github.com/gnss-sdr/gnss-sdr
252 lines
6.7 KiB
C++
252 lines
6.7 KiB
C++
/*!
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* \file galileo_e5a_pcps_acquisition.cc
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* \brief Adapts a PCPS acquisition block to an AcquisitionInterface for
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* Galileo E5a data and pilot Signals
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* \author Antonio Ramos, 2018. antonio.ramos(at)cttc.es
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2019 (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_e5a_pcps_acquisition.h"
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#include "Galileo_E5a.h"
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#include "acq_conf.h"
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#include "configuration_interface.h"
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#include "galileo_e5_signal_processing.h"
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#include "gnss_sdr_flags.h"
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#include <glog/logging.h>
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#include <volk_gnsssdr/volk_gnsssdr_complex.h>
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#include <algorithm>
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GalileoE5aPcpsAcquisition::GalileoE5aPcpsAcquisition(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 = 1;
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acq_parameters_.SetFromConfiguration(configuration_, role, GALILEO_E5A_CODE_CHIP_RATE_CPS, GALILEO_E5A_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_ = 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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acq_pilot_ = configuration_->property(role + ".acquire_pilot", false);
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acq_iq_ = configuration_->property(role + ".acquire_iq", false);
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if (acq_iq_)
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{
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acq_pilot_ = false;
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}
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code_length_ = static_cast<unsigned int>(std::floor(static_cast<double>(acq_parameters_.resampled_fs) / (GALILEO_E5A_CODE_CHIP_RATE_CPS / GALILEO_E5A_CODE_LENGTH_CHIPS)));
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vector_length_ = std::floor(acq_parameters_.sampled_ms * acq_parameters_.samples_per_ms) * (acq_parameters_.bit_transition_flag ? 2 : 1);
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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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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 GalileoE5aPcpsAcquisition::stop_acquisition()
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{
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}
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void GalileoE5aPcpsAcquisition::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 GalileoE5aPcpsAcquisition::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 GalileoE5aPcpsAcquisition::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 GalileoE5aPcpsAcquisition::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 GalileoE5aPcpsAcquisition::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 GalileoE5aPcpsAcquisition::mag()
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{
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return acquisition_->mag();
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}
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void GalileoE5aPcpsAcquisition::init()
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{
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acquisition_->init();
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}
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void GalileoE5aPcpsAcquisition::set_local_code()
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{
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std::vector<std::complex<float>> code(code_length_);
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std::array<char, 3> signal_{};
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signal_[0] = '5';
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signal_[2] = '\0';
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if (acq_iq_)
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{
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signal_[1] = 'X';
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}
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else if (acq_pilot_)
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{
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signal_[1] = 'Q';
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}
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else
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{
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signal_[1] = 'I';
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}
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if (acq_parameters_.use_automatic_resampler)
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{
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galileo_e5_a_code_gen_complex_sampled(code, signal_, gnss_synchro_->PRN, acq_parameters_.resampled_fs, 0);
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}
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else
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{
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galileo_e5_a_code_gen_complex_sampled(code, signal_, gnss_synchro_->PRN, fs_in_, 0);
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}
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gsl::span<gr_complex> code_span(code_.data(), vector_length_);
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for (unsigned int i = 0; i < sampled_ms_; 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 GalileoE5aPcpsAcquisition::reset()
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{
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acquisition_->set_active(true);
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}
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void GalileoE5aPcpsAcquisition::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 GalileoE5aPcpsAcquisition::connect(gr::top_block_sptr top_block __attribute__((unused)))
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{
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if (item_type_ == "gr_complex")
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{
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// nothing to connect
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}
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else if (item_type_ == "cshort")
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{
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// nothing to connect
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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 GalileoE5aPcpsAcquisition::disconnect(gr::top_block_sptr top_block __attribute__((unused)))
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{
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if (item_type_ == "gr_complex")
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{
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// nothing to disconnect
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}
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else if (item_type_ == "cshort")
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{
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// nothing to disconnect
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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 GalileoE5aPcpsAcquisition::get_left_block()
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{
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return acquisition_;
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}
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gr::basic_block_sptr GalileoE5aPcpsAcquisition::get_right_block()
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{
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return acquisition_;
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}
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void GalileoE5aPcpsAcquisition::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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