mirror of https://github.com/gnss-sdr/gnss-sdr
312 lines
9.7 KiB
C++
312 lines
9.7 KiB
C++
/*!
|
|
* \file gps_l5i pcps_acquisition.cc
|
|
* \brief Adapts a PCPS acquisition block to an Acquisition Interface for
|
|
* GPS L5i signals
|
|
* \authors <ul>
|
|
* <li> Javier Arribas, 2017. jarribas(at)cttc.es
|
|
* </ul>
|
|
*
|
|
* -------------------------------------------------------------------------
|
|
*
|
|
* Copyright (C) 2010-2018 (see AUTHORS file for a list of contributors)
|
|
*
|
|
* GNSS-SDR is a software defined Global Navigation
|
|
* Satellite Systems receiver
|
|
*
|
|
* This file is part of GNSS-SDR.
|
|
*
|
|
* GNSS-SDR is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GNSS-SDR is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
|
|
*
|
|
* -------------------------------------------------------------------------
|
|
*/
|
|
|
|
#include "gps_l5i_pcps_acquisition.h"
|
|
#include "configuration_interface.h"
|
|
#include "gps_l5_signal.h"
|
|
#include "GPS_L5.h"
|
|
#include "gnss_sdr_flags.h"
|
|
#include <boost/math/distributions/exponential.hpp>
|
|
#include <glog/logging.h>
|
|
|
|
|
|
using google::LogMessage;
|
|
|
|
GpsL5iPcpsAcquisition::GpsL5iPcpsAcquisition(
|
|
ConfigurationInterface* configuration, std::string role,
|
|
unsigned int in_streams, unsigned int out_streams) : role_(role), in_streams_(in_streams), out_streams_(out_streams)
|
|
{
|
|
pcpsconf_t acq_parameters;
|
|
configuration_ = configuration;
|
|
std::string default_item_type = "gr_complex";
|
|
std::string default_dump_filename = "./data/acquisition.dat";
|
|
|
|
LOG(INFO) << "role " << role;
|
|
|
|
item_type_ = configuration_->property(role + ".item_type", default_item_type);
|
|
|
|
long fs_in_deprecated = configuration_->property("GNSS-SDR.internal_fs_hz", 2048000);
|
|
fs_in_ = configuration_->property("GNSS-SDR.internal_fs_sps", fs_in_deprecated);
|
|
acq_parameters.fs_in = fs_in_;
|
|
if_ = configuration_->property(role + ".if", 0);
|
|
acq_parameters.freq = if_;
|
|
dump_ = configuration_->property(role + ".dump", false);
|
|
acq_parameters.dump = dump_;
|
|
blocking_ = configuration_->property(role + ".blocking", true);
|
|
acq_parameters.blocking = blocking_;
|
|
doppler_max_ = configuration->property(role + ".doppler_max", 5000);
|
|
if (FLAGS_doppler_max != 0) doppler_max_ = FLAGS_doppler_max;
|
|
acq_parameters.doppler_max = doppler_max_;
|
|
bit_transition_flag_ = configuration_->property(role + ".bit_transition_flag", false);
|
|
acq_parameters.bit_transition_flag = bit_transition_flag_;
|
|
use_CFAR_algorithm_flag_ = configuration_->property(role + ".use_CFAR_algorithm", true); //will be false in future versions
|
|
acq_parameters.use_CFAR_algorithm_flag = use_CFAR_algorithm_flag_;
|
|
max_dwells_ = configuration_->property(role + ".max_dwells", 1);
|
|
acq_parameters.max_dwells = max_dwells_;
|
|
dump_filename_ = configuration_->property(role + ".dump_filename", default_dump_filename);
|
|
acq_parameters.dump_filename = dump_filename_;
|
|
//--- Find number of samples per spreading code -------------------------
|
|
code_length_ = static_cast<unsigned int>(std::round(static_cast<double>(fs_in_) / (GPS_L5i_CODE_RATE_HZ / static_cast<double>(GPS_L5i_CODE_LENGTH_CHIPS))));
|
|
|
|
vector_length_ = code_length_;
|
|
|
|
if (bit_transition_flag_)
|
|
{
|
|
vector_length_ *= 2;
|
|
}
|
|
|
|
code_ = new gr_complex[vector_length_];
|
|
|
|
if (item_type_.compare("cshort") == 0)
|
|
{
|
|
item_size_ = sizeof(lv_16sc_t);
|
|
}
|
|
else
|
|
{
|
|
item_size_ = sizeof(gr_complex);
|
|
}
|
|
acq_parameters.samples_per_code = code_length_;
|
|
acq_parameters.samples_per_ms = code_length_;
|
|
acq_parameters.it_size = item_size_;
|
|
acq_parameters.sampled_ms = 1;
|
|
acq_parameters.num_doppler_bins_step2 = configuration_->property(role + ".second_nbins", 4);
|
|
acq_parameters.doppler_step2 = configuration_->property(role + ".second_doppler_step", 125.0);
|
|
acq_parameters.make_2_steps = configuration_->property(role + ".make_two_steps", false);
|
|
acquisition_ = pcps_make_acquisition(acq_parameters);
|
|
DLOG(INFO) << "acquisition(" << acquisition_->unique_id() << ")";
|
|
|
|
stream_to_vector_ = gr::blocks::stream_to_vector::make(item_size_, vector_length_);
|
|
DLOG(INFO) << "stream_to_vector(" << stream_to_vector_->unique_id() << ")";
|
|
|
|
if (item_type_.compare("cbyte") == 0)
|
|
{
|
|
cbyte_to_float_x2_ = make_complex_byte_to_float_x2();
|
|
float_to_complex_ = gr::blocks::float_to_complex::make();
|
|
}
|
|
|
|
channel_ = 0;
|
|
threshold_ = 0.0;
|
|
doppler_step_ = 0;
|
|
gnss_synchro_ = 0;
|
|
}
|
|
|
|
|
|
GpsL5iPcpsAcquisition::~GpsL5iPcpsAcquisition()
|
|
{
|
|
delete[] code_;
|
|
}
|
|
|
|
|
|
void GpsL5iPcpsAcquisition::set_channel(unsigned int channel)
|
|
{
|
|
channel_ = channel;
|
|
acquisition_->set_channel(channel_);
|
|
}
|
|
|
|
|
|
void GpsL5iPcpsAcquisition::set_threshold(float threshold)
|
|
{
|
|
float pfa = configuration_->property(role_ + boost::lexical_cast<std::string>(channel_) + ".pfa", 0.0);
|
|
|
|
if (pfa == 0.0)
|
|
{
|
|
pfa = configuration_->property(role_ + ".pfa", 0.0);
|
|
}
|
|
if (pfa == 0.0)
|
|
{
|
|
threshold_ = threshold;
|
|
}
|
|
else
|
|
{
|
|
threshold_ = calculate_threshold(pfa);
|
|
}
|
|
|
|
DLOG(INFO) << "Channel " << channel_ << " Threshold = " << threshold_;
|
|
|
|
acquisition_->set_threshold(threshold_);
|
|
}
|
|
|
|
|
|
void GpsL5iPcpsAcquisition::set_doppler_max(unsigned int doppler_max)
|
|
{
|
|
doppler_max_ = doppler_max;
|
|
|
|
acquisition_->set_doppler_max(doppler_max_);
|
|
}
|
|
|
|
|
|
// Be aware that Doppler step should be set to 2/(3T) Hz, where T is the coherent integration time (GPS L2 period is 0.02s)
|
|
// Doppler bin minimum size= 33 Hz
|
|
void GpsL5iPcpsAcquisition::set_doppler_step(unsigned int doppler_step)
|
|
{
|
|
doppler_step_ = doppler_step;
|
|
|
|
acquisition_->set_doppler_step(doppler_step_);
|
|
}
|
|
|
|
|
|
void GpsL5iPcpsAcquisition::set_gnss_synchro(Gnss_Synchro* gnss_synchro)
|
|
{
|
|
gnss_synchro_ = gnss_synchro;
|
|
|
|
acquisition_->set_gnss_synchro(gnss_synchro_);
|
|
}
|
|
|
|
|
|
signed int GpsL5iPcpsAcquisition::mag()
|
|
{
|
|
return acquisition_->mag();
|
|
}
|
|
|
|
|
|
void GpsL5iPcpsAcquisition::init()
|
|
{
|
|
acquisition_->init();
|
|
}
|
|
|
|
void GpsL5iPcpsAcquisition::set_local_code()
|
|
{
|
|
gps_l5i_code_gen_complex_sampled(code_, gnss_synchro_->PRN, fs_in_);
|
|
|
|
acquisition_->set_local_code(code_);
|
|
}
|
|
|
|
|
|
void GpsL5iPcpsAcquisition::reset()
|
|
{
|
|
acquisition_->set_active(true);
|
|
}
|
|
|
|
void GpsL5iPcpsAcquisition::set_state(int state)
|
|
{
|
|
acquisition_->set_state(state);
|
|
}
|
|
|
|
|
|
float GpsL5iPcpsAcquisition::calculate_threshold(float pfa)
|
|
{
|
|
//Calculate the threshold
|
|
unsigned int frequency_bins = 0;
|
|
for (int doppler = static_cast<int>(-doppler_max_); doppler <= static_cast<int>(doppler_max_); doppler += doppler_step_)
|
|
{
|
|
frequency_bins++;
|
|
}
|
|
DLOG(INFO) << "Channel " << channel_ << " Pfa = " << pfa;
|
|
unsigned int ncells = vector_length_ * frequency_bins;
|
|
double exponent = 1.0 / static_cast<double>(ncells);
|
|
double val = pow(1.0 - pfa, exponent);
|
|
double lambda = double(vector_length_);
|
|
boost::math::exponential_distribution<double> mydist(lambda);
|
|
float threshold = static_cast<float>(quantile(mydist, val));
|
|
|
|
return threshold;
|
|
}
|
|
|
|
|
|
void GpsL5iPcpsAcquisition::connect(gr::top_block_sptr top_block)
|
|
{
|
|
if (item_type_.compare("gr_complex") == 0)
|
|
{
|
|
top_block->connect(stream_to_vector_, 0, acquisition_, 0);
|
|
}
|
|
else if (item_type_.compare("cshort") == 0)
|
|
{
|
|
top_block->connect(stream_to_vector_, 0, acquisition_, 0);
|
|
}
|
|
else if (item_type_.compare("cbyte") == 0)
|
|
{
|
|
top_block->connect(cbyte_to_float_x2_, 0, float_to_complex_, 0);
|
|
top_block->connect(cbyte_to_float_x2_, 1, float_to_complex_, 1);
|
|
top_block->connect(float_to_complex_, 0, stream_to_vector_, 0);
|
|
top_block->connect(stream_to_vector_, 0, acquisition_, 0);
|
|
}
|
|
else
|
|
{
|
|
LOG(WARNING) << item_type_ << " unknown acquisition item type";
|
|
}
|
|
}
|
|
|
|
|
|
void GpsL5iPcpsAcquisition::disconnect(gr::top_block_sptr top_block)
|
|
{
|
|
if (item_type_.compare("gr_complex") == 0)
|
|
{
|
|
top_block->disconnect(stream_to_vector_, 0, acquisition_, 0);
|
|
}
|
|
else if (item_type_.compare("cshort") == 0)
|
|
{
|
|
top_block->disconnect(stream_to_vector_, 0, acquisition_, 0);
|
|
}
|
|
else if (item_type_.compare("cbyte") == 0)
|
|
{
|
|
// Since a byte-based acq implementation is not available,
|
|
// we just convert cshorts to gr_complex
|
|
top_block->disconnect(cbyte_to_float_x2_, 0, float_to_complex_, 0);
|
|
top_block->disconnect(cbyte_to_float_x2_, 1, float_to_complex_, 1);
|
|
top_block->disconnect(float_to_complex_, 0, stream_to_vector_, 0);
|
|
top_block->disconnect(stream_to_vector_, 0, acquisition_, 0);
|
|
}
|
|
else
|
|
{
|
|
LOG(WARNING) << item_type_ << " unknown acquisition item type";
|
|
}
|
|
}
|
|
|
|
|
|
gr::basic_block_sptr GpsL5iPcpsAcquisition::get_left_block()
|
|
{
|
|
if (item_type_.compare("gr_complex") == 0)
|
|
{
|
|
return stream_to_vector_;
|
|
}
|
|
else if (item_type_.compare("cshort") == 0)
|
|
{
|
|
return stream_to_vector_;
|
|
}
|
|
else if (item_type_.compare("cbyte") == 0)
|
|
{
|
|
return cbyte_to_float_x2_;
|
|
}
|
|
else
|
|
{
|
|
LOG(WARNING) << item_type_ << " unknown acquisition item type";
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
|
|
gr::basic_block_sptr GpsL5iPcpsAcquisition::get_right_block()
|
|
{
|
|
return acquisition_;
|
|
}
|