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https://github.com/gnss-sdr/gnss-sdr
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Documented at .clang-format See http://clang.llvm.org/docs/ClangFormat.html and http://clang.llvm.org/docs/ClangFormatStyleOptions.html
179 lines
6.2 KiB
C++
179 lines
6.2 KiB
C++
/*!
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* \file pulse_blanking_filter.cc
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* \brief Instantiates the GNSS-SDR pulse blanking filter
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* \author Javier Arribas 2017
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* Antonio Ramos 2017
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2017 (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 "pulse_blanking_filter.h"
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#include "configuration_interface.h"
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#include <boost/lexical_cast.hpp>
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#include <glog/logging.h>
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#include <gnuradio/filter/firdes.h>
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#include <vector>
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#include <cmath>
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using google::LogMessage;
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PulseBlankingFilter::PulseBlankingFilter(ConfigurationInterface* configuration, std::string role,
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unsigned int in_streams, unsigned int out_streams) : config_(configuration), role_(role), in_streams_(in_streams), out_streams_(out_streams)
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{
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size_t item_size;
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xlat_ = false;
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std::string default_input_item_type = "gr_complex";
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std::string default_output_item_type = "gr_complex";
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std::string default_dump_filename = "../data/input_filter.dat";
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DLOG(INFO) << "role " << role_;
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input_item_type_ = config_->property(role_ + ".input_item_type", default_input_item_type);
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output_item_type_ = config_->property(role_ + ".output_item_type", default_output_item_type);
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dump_ = config_->property(role_ + ".dump", false);
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dump_filename_ = config_->property(role_ + ".dump_filename", default_dump_filename);
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float default_pfa_ = 0.04;
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float pfa = config_->property(role_ + ".pfa", default_pfa_);
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int default_length_ = 32;
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int length_ = config_->property(role_ + ".length", default_length_);
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int default_n_segments_est = 12500;
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int n_segments_est = config_->property(role_ + ".segments_est", default_n_segments_est);
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int default_n_segments_reset = 5000000;
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int n_segments_reset = config_->property(role_ + ".segments_reset", default_n_segments_reset);
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if (input_item_type_.compare("gr_complex") == 0)
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{
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item_size = sizeof(gr_complex); //output
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input_size_ = sizeof(gr_complex); //input
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pulse_blanking_cc_ = make_pulse_blanking_cc(pfa, length_, n_segments_est, n_segments_reset);
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}
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else
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{
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LOG(ERROR) << " Unknown input filter input/output item type conversion";
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item_size = sizeof(gr_complex); //avoids uninitialization
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input_size_ = sizeof(gr_complex); //avoids uninitialization
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}
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double default_if = 0.0;
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double if_aux = config_->property(role_ + ".if", default_if);
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double if_ = config_->property(role_ + ".IF", if_aux);
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if (std::abs(if_) > 1.0)
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{
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xlat_ = true;
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double default_sampling_freq = 4000000.0;
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double sampling_freq_ = config_->property(role_ + ".sampling_frequency", default_sampling_freq);
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double default_bw = 2000000.0;
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double bw_ = config_->property(role_ + ".bw", default_bw);
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double default_tw = bw_ / 10.0;
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double tw_ = config_->property(role_ + ".tw", default_tw);
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const std::vector<float> taps = gr::filter::firdes::low_pass(1.0, sampling_freq_, bw_, tw_);
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freq_xlating_ = gr::filter::freq_xlating_fir_filter_ccf::make(1, taps, if_, sampling_freq_);
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}
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if (dump_)
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{
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DLOG(INFO) << "Dumping output into file " << dump_filename_;
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std::cout << "Dumping output into file " << dump_filename_ << std::endl;
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file_sink_ = gr::blocks::file_sink::make(item_size, dump_filename_.c_str());
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}
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}
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PulseBlankingFilter::~PulseBlankingFilter()
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{
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}
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void PulseBlankingFilter::connect(gr::top_block_sptr top_block)
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{
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if (input_item_type_.compare("gr_complex") == 0)
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{
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if (dump_)
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{
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top_block->connect(pulse_blanking_cc_, 0, file_sink_, 0);
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}
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if (xlat_)
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{
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top_block->connect(freq_xlating_, 0, pulse_blanking_cc_, 0);
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}
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}
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else
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{
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LOG(ERROR) << " Unknown input filter input/output item type conversion";
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}
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}
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void PulseBlankingFilter::disconnect(gr::top_block_sptr top_block)
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{
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if (input_item_type_.compare("gr_complex") == 0)
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{
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if (dump_)
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{
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top_block->disconnect(pulse_blanking_cc_, 0, file_sink_, 0);
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}
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if (xlat_)
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{
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top_block->disconnect(freq_xlating_, 0, pulse_blanking_cc_, 0);
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}
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}
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else
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{
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LOG(ERROR) << " Unknown input filter input/output item type conversion";
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}
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}
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gr::basic_block_sptr PulseBlankingFilter::get_left_block()
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{
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if (input_item_type_.compare("gr_complex") == 0)
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{
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if (xlat_)
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{
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return freq_xlating_;
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}
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else
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{
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return pulse_blanking_cc_;
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}
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}
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else
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{
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return nullptr;
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LOG(ERROR) << " Unknown input filter input/output item type conversion";
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}
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}
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gr::basic_block_sptr PulseBlankingFilter::get_right_block()
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{
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if (input_item_type_.compare("gr_complex") == 0)
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{
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return pulse_blanking_cc_;
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}
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else
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{
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return nullptr;
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LOG(ERROR) << " Unknown input filter input/output item type conversion";
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}
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}
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