mirror of
https://github.com/gnss-sdr/gnss-sdr
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Add pcps acquisition adapter for glonass l1 ca signal
This commit is contained in:
Gastd
parent
f7092b68b6
commit
5ad65ab0e1
@ -31,6 +31,7 @@ set(ACQ_ADAPTER_SOURCES
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galileo_e1_pcps_tong_ambiguous_acquisition.cc
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galileo_e1_pcps_8ms_ambiguous_acquisition.cc
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galileo_e5a_noncoherent_iq_acquisition_caf.cc
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glonass_l1_ca_pcps_acquisition.cc
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)
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if(ENABLE_FPGA)
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@ -0,0 +1,366 @@
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#include "glonass_l1_ca_pcps_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 "glonass_l1_signal_processing.h"
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#include "Glonass_L1_CA.h"
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#include "configuration_interface.h"
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using google::LogMessage;
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GlonassL1CaPcpsAcquisition::GlonassL1CaPcpsAcquisition(
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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", 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 + ".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(role + ".bit_transition_flag", false);
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use_CFAR_algorithm_flag_=configuration_->property(role + ".use_CFAR_algorithm", true); //will be false in future versions
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max_dwells_ = configuration_->property(role + ".max_dwells", 1);
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dump_filename_ = configuration_->property(role + ".dump_filename", default_dump_filename);
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//--- Find number of samples per spreading code -------------------------
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code_length_ = round(fs_in_ / (GLONASS_L1_CA_CODE_RATE_HZ / GLONASS_L1_CA_CODE_LENGTH_CHIPS));
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LOG(ERROR) << "fs_in_ " << fs_in_;
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LOG(ERROR) << "code_length_ " << code_length_;
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vector_length_ = code_length_ * sampled_ms_;
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LOG(ERROR) << "vector_length_ " << vector_length_;
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if( bit_transition_flag_ )
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{
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vector_length_ *= 2;
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}
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code_ = new gr_complex[vector_length_];
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if (item_type_.compare("cshort") == 0 )
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{
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item_size_ = sizeof(lv_16sc_t);
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acquisition_sc_ = pcps_make_acquisition_sc(sampled_ms_, max_dwells_,
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doppler_max_, if_, fs_in_, code_length_, code_length_,
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bit_transition_flag_, use_CFAR_algorithm_flag_, dump_, dump_filename_);
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DLOG(INFO) << "acquisition(" << acquisition_sc_->unique_id() << ")";
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}else{
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item_size_ = sizeof(gr_complex);
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acquisition_cc_ = pcps_make_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_, use_CFAR_algorithm_flag_, dump_, dump_filename_);
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DLOG(INFO) << "acquisition(" << acquisition_cc_->unique_id() << ")";
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}
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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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if (item_type_.compare("cbyte") == 0)
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{
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cbyte_to_float_x2_ = make_complex_byte_to_float_x2();
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float_to_complex_ = gr::blocks::float_to_complex::make();
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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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GlonassL1CaPcpsAcquisition::~GlonassL1CaPcpsAcquisition()
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{
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delete[] code_;
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}
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void GlonassL1CaPcpsAcquisition::set_channel(unsigned int channel)
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{
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channel_ = channel;
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if (item_type_.compare("cshort") == 0)
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{
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acquisition_sc_->set_channel(channel_);
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}
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else
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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 GlonassL1CaPcpsAcquisition::set_threshold(float threshold)
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{
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float 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("cshort") == 0)
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{
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acquisition_sc_->set_threshold(threshold_);
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}
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else
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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 GlonassL1CaPcpsAcquisition::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("cshort") == 0)
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{
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acquisition_sc_->set_doppler_max(doppler_max_);
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}
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else
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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 GlonassL1CaPcpsAcquisition::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("cshort") == 0)
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{
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acquisition_sc_->set_doppler_step(doppler_step_);
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}
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else
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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 GlonassL1CaPcpsAcquisition::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("cshort") == 0)
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{
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acquisition_sc_->set_gnss_synchro(gnss_synchro_);
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}
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else
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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 GlonassL1CaPcpsAcquisition::mag()
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{
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if (item_type_.compare("cshort") == 0)
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{
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return acquisition_sc_->mag();
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}
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else
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{
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return acquisition_cc_->mag();
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}
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}
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void GlonassL1CaPcpsAcquisition::init()
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{
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if (item_type_.compare("cshort") == 0)
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{
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acquisition_sc_->init();
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}
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else
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{
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acquisition_cc_->init();
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}
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set_local_code();
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}
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void GlonassL1CaPcpsAcquisition::set_local_code()
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{
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std::complex<float>* code = new std::complex<float>[code_length_];
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glonass_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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if (item_type_.compare("cshort") == 0)
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{
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acquisition_sc_->set_local_code(code_);
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}
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else
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{
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acquisition_cc_->set_local_code(code_);
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}
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delete[] code;
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}
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void GlonassL1CaPcpsAcquisition::reset()
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{
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if (item_type_.compare("cshort") == 0)
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{
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acquisition_sc_->set_active(true);
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}
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else
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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 GlonassL1CaPcpsAcquisition::set_state(int state)
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{
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if (item_type_.compare("cshort") == 0)
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{
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acquisition_sc_->set_state(state);
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}
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else
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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 GlonassL1CaPcpsAcquisition::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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/*
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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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*/
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frequency_bins = (2*doppler_max_ + doppler_step_)/doppler_step_;
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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 = (float)quantile(mydist,val);
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return threshold;
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}
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void GlonassL1CaPcpsAcquisition::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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else if (item_type_.compare("cshort") == 0)
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{
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top_block->connect(stream_to_vector_, 0, acquisition_sc_, 0);
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}
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else if (item_type_.compare("cbyte") == 0)
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{
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top_block->connect(cbyte_to_float_x2_, 0, float_to_complex_, 0);
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top_block->connect(cbyte_to_float_x2_, 1, float_to_complex_, 1);
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top_block->connect(float_to_complex_, 0, stream_to_vector_, 0);
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top_block->connect(stream_to_vector_, 0, acquisition_cc_, 0);
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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 GlonassL1CaPcpsAcquisition::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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else if (item_type_.compare("cshort") == 0)
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{
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top_block->disconnect(stream_to_vector_, 0, acquisition_sc_, 0);
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}
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else if (item_type_.compare("cbyte") == 0)
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{
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// Since a byte-based acq implementation is not available,
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// we just convert cshorts to gr_complex
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top_block->disconnect(cbyte_to_float_x2_, 0, float_to_complex_, 0);
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top_block->disconnect(cbyte_to_float_x2_, 1, float_to_complex_, 1);
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top_block->disconnect(float_to_complex_, 0, stream_to_vector_, 0);
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top_block->disconnect(stream_to_vector_, 0, acquisition_cc_, 0);
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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 GlonassL1CaPcpsAcquisition::get_left_block()
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{
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if (item_type_.compare("gr_complex") == 0)
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{
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return stream_to_vector_;
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}
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else if (item_type_.compare("cshort") == 0)
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{
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return stream_to_vector_;
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}
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else if (item_type_.compare("cbyte") == 0)
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{
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return cbyte_to_float_x2_;
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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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return nullptr;
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}
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}
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gr::basic_block_sptr GlonassL1CaPcpsAcquisition::get_right_block()
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{
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if (item_type_.compare("cshort") == 0)
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{
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return acquisition_sc_;
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}
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else
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{
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return acquisition_cc_;
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}
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}
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@ -0,0 +1,138 @@
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#ifndef GNSS_SDR_GLONASS_L1_CA_PCPS_ACQUISITION_H_
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#define GNSS_SDR_GLONASS_L1_CA_PCPS_ACQUISITION_H_
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#include <string>
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#include <gnuradio/blocks/stream_to_vector.h>
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#include <gnuradio/blocks/float_to_complex.h>
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#include "gnss_synchro.h"
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#include "acquisition_interface.h"
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#include "pcps_acquisition_cc.h"
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#include "pcps_acquisition_sc.h"
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#include "complex_byte_to_float_x2.h"
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#include <volk_gnsssdr/volk_gnsssdr.h>
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class ConfigurationInterface;
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/*!
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* \brief This class adapts a PCPS acquisition block to an AcquisitionInterface
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* for GPS L1 C/A signals
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*/
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class GlonassL1CaPcpsAcquisition: public AcquisitionInterface
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{
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public:
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GlonassL1CaPcpsAcquisition(ConfigurationInterface* configuration,
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std::string role, unsigned int in_streams,
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unsigned int out_streams);
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virtual ~GlonassL1CaPcpsAcquisition();
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std::string role()
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{
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return role_;
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}
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/*!
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* \brief Returns "GLONASS_L1_CA_PCPS_Acquisition"
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*/
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std::string implementation()
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{
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return "GLONASS_L1_CA_PCPS_Acquisition";
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}
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size_t item_size()
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{
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return item_size_;
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}
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void connect(gr::top_block_sptr top_block);
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void disconnect(gr::top_block_sptr top_block);
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gr::basic_block_sptr get_left_block();
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gr::basic_block_sptr get_right_block();
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/*!
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* \brief Set acquisition/tracking common Gnss_Synchro object pointer
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* to efficiently exchange synchronization data between acquisition and
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* tracking blocks
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*/
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void set_gnss_synchro(Gnss_Synchro* p_gnss_synchro);
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/*!
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* \brief Set acquisition channel unique ID
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*/
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void set_channel(unsigned int channel);
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/*!
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* \brief Set statistics threshold of PCPS algorithm
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*/
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void set_threshold(float threshold);
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/*!
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* \brief Set maximum Doppler off grid search
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*/
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void set_doppler_max(unsigned int doppler_max);
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/*!
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* \brief Set Doppler steps for the grid search
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*/
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void set_doppler_step(unsigned int doppler_step);
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/*!
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* \brief Initializes acquisition algorithm.
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*/
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void init();
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/*!
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* \brief Sets local code for GPS L1/CA PCPS acquisition algorithm.
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*/
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void set_local_code();
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/*!
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* \brief Returns the maximum peak of grid search
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*/
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signed int mag();
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/*!
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* \brief Restart acquisition algorithm
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*/
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void reset();
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/*!
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* \brief If state = 1, it forces the block to start acquiring from the first sample
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*/
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void set_state(int state);
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private:
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ConfigurationInterface* configuration_;
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pcps_acquisition_cc_sptr acquisition_cc_;
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pcps_acquisition_sc_sptr acquisition_sc_;
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gr::blocks::stream_to_vector::sptr stream_to_vector_;
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gr::blocks::float_to_complex::sptr float_to_complex_;
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complex_byte_to_float_x2_sptr cbyte_to_float_x2_;
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size_t item_size_;
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std::string item_type_;
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unsigned int vector_length_;
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unsigned int code_length_;
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bool bit_transition_flag_;
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bool use_CFAR_algorithm_flag_;
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unsigned int channel_;
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float threshold_;
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unsigned int doppler_max_;
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unsigned int doppler_step_;
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unsigned int sampled_ms_;
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unsigned int max_dwells_;
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long fs_in_;
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long if_;
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bool dump_;
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std::string dump_filename_;
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std::complex<float> * code_;
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Gnss_Synchro * gnss_synchro_;
|
||||
std::string role_;
|
||||
unsigned int in_streams_;
|
||||
unsigned int out_streams_;
|
||||
|
||||
float calculate_threshold(float pfa);
|
||||
};
|
||||
|
||||
#endif /* GNSS_SDR_GLONASS_L1_CA_PCPS_ACQUISITION_H_ */
|
||||
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Reference in New Issue
Block a user