mirror of
https://github.com/gnss-sdr/gnss-sdr
synced 2024-12-14 04:00:34 +00:00
Add pcps acquisition adapter for glonass l1 ca signal
This commit is contained in:
Gastd
parent
a02cf31b1f
commit
4f9a6d0e88
@ -31,6 +31,7 @@ set(ACQ_ADAPTER_SOURCES
|
||||
galileo_e1_pcps_tong_ambiguous_acquisition.cc
|
||||
galileo_e1_pcps_8ms_ambiguous_acquisition.cc
|
||||
galileo_e5a_noncoherent_iq_acquisition_caf.cc
|
||||
glonass_l1_ca_pcps_acquisition.cc
|
||||
)
|
||||
|
||||
if(ENABLE_FPGA)
|
||||
|
||||
@ -0,0 +1,366 @@
|
||||
#include "glonass_l1_ca_pcps_acquisition.h"
|
||||
#include <boost/math/distributions/exponential.hpp>
|
||||
#include <glog/logging.h>
|
||||
#include "glonass_l1_signal_processing.h"
|
||||
#include "Glonass_L1_CA.h"
|
||||
#include "configuration_interface.h"
|
||||
|
||||
|
||||
using google::LogMessage;
|
||||
GlonassL1CaPcpsAcquisition::GlonassL1CaPcpsAcquisition(
|
||||
ConfigurationInterface* configuration, std::string role,
|
||||
unsigned int in_streams, unsigned int out_streams) :
|
||||
role_(role), in_streams_(in_streams), out_streams_(out_streams)
|
||||
{
|
||||
configuration_ = configuration;
|
||||
std::string default_item_type = "gr_complex";
|
||||
std::string default_dump_filename = "./data/acquisition.dat";
|
||||
|
||||
DLOG(INFO) << "role " << role;
|
||||
|
||||
item_type_ = configuration_->property(role + ".item_type", default_item_type);
|
||||
|
||||
fs_in_ = configuration_->property("GNSS-SDR.internal_fs_hz", 2048000);
|
||||
if_ = configuration_->property(role + ".if", 0);
|
||||
dump_ = configuration_->property(role + ".dump", false);
|
||||
doppler_max_ = configuration_->property(role + ".doppler_max", 5000);
|
||||
sampled_ms_ = configuration_->property(role + ".coherent_integration_time_ms", 1);
|
||||
|
||||
bit_transition_flag_ = configuration_->property(role + ".bit_transition_flag", false);
|
||||
use_CFAR_algorithm_flag_=configuration_->property(role + ".use_CFAR_algorithm", true); //will be false in future versions
|
||||
|
||||
max_dwells_ = configuration_->property(role + ".max_dwells", 1);
|
||||
|
||||
dump_filename_ = configuration_->property(role + ".dump_filename", default_dump_filename);
|
||||
|
||||
//--- Find number of samples per spreading code -------------------------
|
||||
code_length_ = round(fs_in_ / (GLONASS_L1_CA_CODE_RATE_HZ / GLONASS_L1_CA_CODE_LENGTH_CHIPS));
|
||||
|
||||
LOG(ERROR) << "fs_in_ " << fs_in_;
|
||||
LOG(ERROR) << "code_length_ " << code_length_;
|
||||
|
||||
vector_length_ = code_length_ * sampled_ms_;
|
||||
|
||||
LOG(ERROR) << "vector_length_ " << vector_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);
|
||||
acquisition_sc_ = pcps_make_acquisition_sc(sampled_ms_, max_dwells_,
|
||||
doppler_max_, if_, fs_in_, code_length_, code_length_,
|
||||
bit_transition_flag_, use_CFAR_algorithm_flag_, dump_, dump_filename_);
|
||||
DLOG(INFO) << "acquisition(" << acquisition_sc_->unique_id() << ")";
|
||||
|
||||
}else{
|
||||
item_size_ = sizeof(gr_complex);
|
||||
acquisition_cc_ = pcps_make_acquisition_cc(sampled_ms_, max_dwells_,
|
||||
doppler_max_, if_, fs_in_, code_length_, code_length_,
|
||||
bit_transition_flag_, use_CFAR_algorithm_flag_, dump_, dump_filename_);
|
||||
DLOG(INFO) << "acquisition(" << acquisition_cc_->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;
|
||||
}
|
||||
|
||||
|
||||
GlonassL1CaPcpsAcquisition::~GlonassL1CaPcpsAcquisition()
|
||||
{
|
||||
delete[] code_;
|
||||
}
|
||||
|
||||
|
||||
void GlonassL1CaPcpsAcquisition::set_channel(unsigned int channel)
|
||||
{
|
||||
channel_ = channel;
|
||||
if (item_type_.compare("cshort") == 0)
|
||||
{
|
||||
acquisition_sc_->set_channel(channel_);
|
||||
}
|
||||
else
|
||||
{
|
||||
acquisition_cc_->set_channel(channel_);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void GlonassL1CaPcpsAcquisition::set_threshold(float threshold)
|
||||
{
|
||||
float pfa = configuration_->property(role_ + ".pfa", 0.0);
|
||||
|
||||
if(pfa == 0.0)
|
||||
{
|
||||
threshold_ = threshold;
|
||||
}
|
||||
else
|
||||
{
|
||||
threshold_ = calculate_threshold(pfa);
|
||||
}
|
||||
|
||||
DLOG(INFO) << "Channel " << channel_ << " Threshold = " << threshold_;
|
||||
|
||||
|
||||
if (item_type_.compare("cshort") == 0)
|
||||
{
|
||||
acquisition_sc_->set_threshold(threshold_);
|
||||
}
|
||||
else
|
||||
{
|
||||
acquisition_cc_->set_threshold(threshold_);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void GlonassL1CaPcpsAcquisition::set_doppler_max(unsigned int doppler_max)
|
||||
{
|
||||
doppler_max_ = doppler_max;
|
||||
|
||||
if (item_type_.compare("cshort") == 0)
|
||||
{
|
||||
acquisition_sc_->set_doppler_max(doppler_max_);
|
||||
}
|
||||
else
|
||||
{
|
||||
acquisition_cc_->set_doppler_max(doppler_max_);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void GlonassL1CaPcpsAcquisition::set_doppler_step(unsigned int doppler_step)
|
||||
{
|
||||
doppler_step_ = doppler_step;
|
||||
|
||||
if (item_type_.compare("cshort") == 0)
|
||||
{
|
||||
acquisition_sc_->set_doppler_step(doppler_step_);
|
||||
}
|
||||
else
|
||||
{
|
||||
acquisition_cc_->set_doppler_step(doppler_step_);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void GlonassL1CaPcpsAcquisition::set_gnss_synchro(Gnss_Synchro* gnss_synchro)
|
||||
{
|
||||
gnss_synchro_ = gnss_synchro;
|
||||
|
||||
if (item_type_.compare("cshort") == 0)
|
||||
{
|
||||
acquisition_sc_->set_gnss_synchro(gnss_synchro_);
|
||||
}
|
||||
else
|
||||
{
|
||||
acquisition_cc_->set_gnss_synchro(gnss_synchro_);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
signed int GlonassL1CaPcpsAcquisition::mag()
|
||||
{
|
||||
if (item_type_.compare("cshort") == 0)
|
||||
{
|
||||
return acquisition_sc_->mag();
|
||||
}
|
||||
else
|
||||
{
|
||||
return acquisition_cc_->mag();
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void GlonassL1CaPcpsAcquisition::init()
|
||||
{
|
||||
if (item_type_.compare("cshort") == 0)
|
||||
{
|
||||
acquisition_sc_->init();
|
||||
}
|
||||
else
|
||||
{
|
||||
acquisition_cc_->init();
|
||||
}
|
||||
|
||||
set_local_code();
|
||||
}
|
||||
|
||||
|
||||
void GlonassL1CaPcpsAcquisition::set_local_code()
|
||||
{
|
||||
|
||||
std::complex<float>* code = new std::complex<float>[code_length_];
|
||||
|
||||
glonass_l1_ca_code_gen_complex_sampled(code,/* gnss_synchro_->PRN,*/ fs_in_, 0);
|
||||
|
||||
for (unsigned int i = 0; i < sampled_ms_; i++)
|
||||
{
|
||||
memcpy(&(code_[i*code_length_]), code,
|
||||
sizeof(gr_complex)*code_length_);
|
||||
}
|
||||
|
||||
if (item_type_.compare("cshort") == 0)
|
||||
{
|
||||
acquisition_sc_->set_local_code(code_);
|
||||
}
|
||||
else
|
||||
{
|
||||
acquisition_cc_->set_local_code(code_);
|
||||
}
|
||||
|
||||
delete[] code;
|
||||
}
|
||||
|
||||
|
||||
void GlonassL1CaPcpsAcquisition::reset()
|
||||
{
|
||||
if (item_type_.compare("cshort") == 0)
|
||||
{
|
||||
acquisition_sc_->set_active(true);
|
||||
}
|
||||
else
|
||||
{
|
||||
acquisition_cc_->set_active(true);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void GlonassL1CaPcpsAcquisition::set_state(int state)
|
||||
{
|
||||
if (item_type_.compare("cshort") == 0)
|
||||
{
|
||||
acquisition_sc_->set_state(state);
|
||||
}
|
||||
else
|
||||
{
|
||||
acquisition_cc_->set_state(state);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
float GlonassL1CaPcpsAcquisition::calculate_threshold(float pfa)
|
||||
{
|
||||
//Calculate the threshold
|
||||
unsigned int frequency_bins = 0;
|
||||
/*
|
||||
for (int doppler = (int)(-doppler_max_); doppler <= (int)doppler_max_; doppler += doppler_step_)
|
||||
{
|
||||
frequency_bins++;
|
||||
}
|
||||
*/
|
||||
|
||||
frequency_bins = (2*doppler_max_ + doppler_step_)/doppler_step_;
|
||||
|
||||
DLOG(INFO) << "Channel " << channel_ << " Pfa = " << pfa;
|
||||
unsigned int ncells = vector_length_ * frequency_bins;
|
||||
double exponent = 1 / 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 = (float)quantile(mydist,val);
|
||||
|
||||
return threshold;
|
||||
}
|
||||
|
||||
|
||||
void GlonassL1CaPcpsAcquisition::connect(gr::top_block_sptr top_block)
|
||||
{
|
||||
if (item_type_.compare("gr_complex") == 0)
|
||||
{
|
||||
top_block->connect(stream_to_vector_, 0, acquisition_cc_, 0);
|
||||
}
|
||||
else if (item_type_.compare("cshort") == 0)
|
||||
{
|
||||
top_block->connect(stream_to_vector_, 0, acquisition_sc_, 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_cc_, 0);
|
||||
}
|
||||
else
|
||||
{
|
||||
LOG(WARNING) << item_type_ << " unknown acquisition item type";
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void GlonassL1CaPcpsAcquisition::disconnect(gr::top_block_sptr top_block)
|
||||
{
|
||||
if (item_type_.compare("gr_complex") == 0)
|
||||
{
|
||||
top_block->disconnect(stream_to_vector_, 0, acquisition_cc_, 0);
|
||||
}
|
||||
else if (item_type_.compare("cshort") == 0)
|
||||
{
|
||||
top_block->disconnect(stream_to_vector_, 0, acquisition_sc_, 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_cc_, 0);
|
||||
}
|
||||
else
|
||||
{
|
||||
LOG(WARNING) << item_type_ << " unknown acquisition item type";
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
gr::basic_block_sptr GlonassL1CaPcpsAcquisition::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 GlonassL1CaPcpsAcquisition::get_right_block()
|
||||
{
|
||||
if (item_type_.compare("cshort") == 0)
|
||||
{
|
||||
return acquisition_sc_;
|
||||
}
|
||||
else
|
||||
{
|
||||
return acquisition_cc_;
|
||||
}
|
||||
}
|
||||
|
||||
@ -0,0 +1,138 @@
|
||||
|
||||
#ifndef GNSS_SDR_GLONASS_L1_CA_PCPS_ACQUISITION_H_
|
||||
#define GNSS_SDR_GLONASS_L1_CA_PCPS_ACQUISITION_H_
|
||||
|
||||
#include <string>
|
||||
#include <gnuradio/blocks/stream_to_vector.h>
|
||||
#include <gnuradio/blocks/float_to_complex.h>
|
||||
#include "gnss_synchro.h"
|
||||
#include "acquisition_interface.h"
|
||||
#include "pcps_acquisition_cc.h"
|
||||
#include "pcps_acquisition_sc.h"
|
||||
#include "complex_byte_to_float_x2.h"
|
||||
#include <volk_gnsssdr/volk_gnsssdr.h>
|
||||
|
||||
|
||||
|
||||
class ConfigurationInterface;
|
||||
|
||||
/*!
|
||||
* \brief This class adapts a PCPS acquisition block to an AcquisitionInterface
|
||||
* for GPS L1 C/A signals
|
||||
*/
|
||||
class GlonassL1CaPcpsAcquisition: public AcquisitionInterface
|
||||
{
|
||||
public:
|
||||
GlonassL1CaPcpsAcquisition(ConfigurationInterface* configuration,
|
||||
std::string role, unsigned int in_streams,
|
||||
unsigned int out_streams);
|
||||
|
||||
virtual ~GlonassL1CaPcpsAcquisition();
|
||||
|
||||
std::string role()
|
||||
{
|
||||
return role_;
|
||||
}
|
||||
|
||||
/*!
|
||||
* \brief Returns "GLONASS_L1_CA_PCPS_Acquisition"
|
||||
*/
|
||||
std::string implementation()
|
||||
{
|
||||
return "GLONASS_L1_CA_PCPS_Acquisition";
|
||||
}
|
||||
size_t item_size()
|
||||
{
|
||||
return item_size_;
|
||||
}
|
||||
|
||||
void connect(gr::top_block_sptr top_block);
|
||||
void disconnect(gr::top_block_sptr top_block);
|
||||
gr::basic_block_sptr get_left_block();
|
||||
gr::basic_block_sptr get_right_block();
|
||||
|
||||
/*!
|
||||
* \brief Set acquisition/tracking common Gnss_Synchro object pointer
|
||||
* to efficiently exchange synchronization data between acquisition and
|
||||
* tracking blocks
|
||||
*/
|
||||
void set_gnss_synchro(Gnss_Synchro* p_gnss_synchro);
|
||||
|
||||
/*!
|
||||
* \brief Set acquisition channel unique ID
|
||||
*/
|
||||
void set_channel(unsigned int channel);
|
||||
|
||||
/*!
|
||||
* \brief Set statistics threshold of PCPS algorithm
|
||||
*/
|
||||
void set_threshold(float threshold);
|
||||
|
||||
/*!
|
||||
* \brief Set maximum Doppler off grid search
|
||||
*/
|
||||
void set_doppler_max(unsigned int doppler_max);
|
||||
|
||||
/*!
|
||||
* \brief Set Doppler steps for the grid search
|
||||
*/
|
||||
void set_doppler_step(unsigned int doppler_step);
|
||||
|
||||
/*!
|
||||
* \brief Initializes acquisition algorithm.
|
||||
*/
|
||||
void init();
|
||||
|
||||
/*!
|
||||
* \brief Sets local code for GPS L1/CA PCPS acquisition algorithm.
|
||||
*/
|
||||
void set_local_code();
|
||||
|
||||
/*!
|
||||
* \brief Returns the maximum peak of grid search
|
||||
*/
|
||||
signed int mag();
|
||||
|
||||
/*!
|
||||
* \brief Restart acquisition algorithm
|
||||
*/
|
||||
void reset();
|
||||
|
||||
/*!
|
||||
* \brief If state = 1, it forces the block to start acquiring from the first sample
|
||||
*/
|
||||
void set_state(int state);
|
||||
|
||||
private:
|
||||
ConfigurationInterface* configuration_;
|
||||
pcps_acquisition_cc_sptr acquisition_cc_;
|
||||
pcps_acquisition_sc_sptr acquisition_sc_;
|
||||
gr::blocks::stream_to_vector::sptr stream_to_vector_;
|
||||
gr::blocks::float_to_complex::sptr float_to_complex_;
|
||||
complex_byte_to_float_x2_sptr cbyte_to_float_x2_;
|
||||
size_t item_size_;
|
||||
std::string item_type_;
|
||||
unsigned int vector_length_;
|
||||
unsigned int code_length_;
|
||||
bool bit_transition_flag_;
|
||||
bool use_CFAR_algorithm_flag_;
|
||||
unsigned int channel_;
|
||||
float threshold_;
|
||||
unsigned int doppler_max_;
|
||||
unsigned int doppler_step_;
|
||||
unsigned int sampled_ms_;
|
||||
unsigned int max_dwells_;
|
||||
long fs_in_;
|
||||
long if_;
|
||||
bool dump_;
|
||||
std::string dump_filename_;
|
||||
std::complex<float> * code_;
|
||||
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_ */
|
||||
Loading…
Reference in New Issue
Block a user