mirrors/gnss-sdr
1
0
Fork 0
mirror of https://github.com/gnss-sdr/gnss-sdr synced 2025-10-31 07:13:03 +00:00
Code Issues Releases Wiki Activity

Merge branch 'new_acq_grid' of https://github.com/antonioramosdet/gnss-sdr into antonioramosdet-new_acq_grid

Browse Source
This commit is contained in:
Carles Fernandez
2018-01-31 15:15:43 +01:00
parent 04a2dd9291 11f332f9d8
commit e23dd178d6
12 changed files with 306 additions and 159 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
CMakeLists.txt
View File

@@ -1112,7 +1112,7 @@ if(NOT MATIO_FOUND)
if(CMAKE_VERSION VERSION_LESS 3.2)
ExternalProject_Add(
matio-${GNSSSDR_MATIO_LOCAL_VERSION}
PREFIX ${CMAKE_CURRENT_BINARY_DIR}/mati
PREFIX ${CMAKE_CURRENT_BINARY_DIR}/matio
GIT_REPOSITORY https://github.com/tbeu/matio
GIT_TAG v${GNSSSDR_MATIO_LOCAL_VERSION}
SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/matio/matio-${GNSSSDR_MATIO_LOCAL_VERSION}

3
src/algorithms/acquisition/gnuradio_blocks/CMakeLists.txt
View File

@@ -48,6 +48,7 @@ include_directories(
${GFlags_INCLUDE_DIRS}
${GNURADIO_RUNTIME_INCLUDE_DIRS}
${VOLK_GNSSSDR_INCLUDE_DIRS}
${MATIO_INCLUDE_DIRS}
)
@@ -69,7 +70,7 @@ source_group(Headers FILES ${ACQ_GR_BLOCKS_HEADERS})
if(ENABLE_FPGA)
target_link_libraries(acq_gr_blocks acquisition_lib gnss_sp_libs gnss_system_parameters ${GNURADIO_RUNTIME_LIBRARIES} ${GNURADIO_FFT_LIBRARIES} ${VOLK_LIBRARIES} ${VOLK_GNSSSDR_LIBRARIES} ${OPT_LIBRARIES} ${OPT_ACQUISITION_LIBRARIES})
else(ENABLE_FPGA)
target_link_libraries(acq_gr_blocks gnss_sp_libs gnss_system_parameters ${GNURADIO_RUNTIME_LIBRARIES} ${GNURADIO_FFT_LIBRARIES} ${VOLK_LIBRARIES} ${VOLK_GNSSSDR_LIBRARIES} ${OPT_LIBRARIES} ${OPT_ACQUISITION_LIBRARIES})
target_link_libraries(acq_gr_blocks gnss_sp_libs gnss_system_parameters ${GNURADIO_RUNTIME_LIBRARIES} ${GNURADIO_FFT_LIBRARIES} ${VOLK_LIBRARIES} ${VOLK_GNSSSDR_LIBRARIES} ${OPT_LIBRARIES} ${OPT_ACQUISITION_LIBRARIES} ${MATIO_LIBRARIES})
endif(ENABLE_FPGA)
if(NOT VOLK_GNSSSDR_FOUND)
add_dependencies(acq_gr_blocks volk_gnsssdr_module)

70
src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition_cc.cc
View File

@@ -44,6 +44,7 @@
#include "control_message_factory.h"
#include "GPS_L1_CA.h" //GPS_TWO_PI
#include "GLONASS_L1_CA.h" //GLONASS_TWO_PI
#include <matio.h>
using google::LogMessage;
@@ -98,9 +99,6 @@ pcps_acquisition_cc::pcps_acquisition_cc(
d_code_phase = 0;
d_test_statistics = 0.0;
d_channel = 0;
d_doppler_freq = 0.0;
//set_relative_rate( 1.0/d_fft_size );
// COD:
// Experimenting with the overlap/save technique for handling bit trannsitions
@@ -135,6 +133,7 @@ pcps_acquisition_cc::pcps_acquisition_cc(
d_blocking = blocking;
d_worker_active = false;
d_data_buffer = static_cast<gr_complex*>(volk_gnsssdr_malloc(d_fft_size * sizeof(gr_complex), volk_gnsssdr_get_alignment()));
grid_ = arma::fmat();
}
@@ -148,17 +147,10 @@ pcps_acquisition_cc::~pcps_acquisition_cc()
}
delete[] d_grid_doppler_wipeoffs;
}
volk_gnsssdr_free(d_fft_codes);
volk_gnsssdr_free(d_magnitude);
delete d_ifft;
delete d_fft_if;
if (d_dump)
{
d_dump_file.close();
}
volk_gnsssdr_free(d_data_buffer);
}
@@ -243,6 +235,12 @@ void pcps_acquisition_cc::init()
update_local_carrier(d_grid_doppler_wipeoffs[doppler_index], d_fft_size, d_freq + doppler);
}
d_worker_active = false;
if(d_dump)
{
unsigned int effective_fft_size = (d_bit_transition_flag ? (d_fft_size / 2) : d_fft_size);
grid_ = arma::fmat(effective_fft_size, d_num_doppler_bins, arma::fill::zeros);
}
}
@@ -481,24 +479,44 @@ void pcps_acquisition_cc::acquisition_core( unsigned long int samp_count )
// Record results to file if required
if (d_dump)
{
std::stringstream filename;
std::streamsize n = 2 * sizeof(float) * (d_fft_size); // complex file write
filename.str("");
boost::filesystem::path p = d_dump_filename;
filename << p.parent_path().string()
<< boost::filesystem::path::preferred_separator
<< p.stem().string()
<< "_" << d_gnss_synchro->System
<<"_" << d_gnss_synchro->Signal << "_sat_"
<< d_gnss_synchro->PRN << "_doppler_"
<< doppler
<< p.extension().string();
memcpy(grid_.colptr(doppler_index), d_magnitude, sizeof(float) * effective_fft_size);
if(doppler_index == (d_num_doppler_bins - 1))
{
std::string filename = d_dump_filename;
filename.append("_");
filename.append(1, d_gnss_synchro->System);
filename.append("_");
filename.append(1, d_gnss_synchro->Signal[0]);
filename.append(1, d_gnss_synchro->Signal[1]);
filename.append("_sat_");
filename.append(std::to_string(d_gnss_synchro->PRN));
filename.append(".mat");
mat_t* matfp = Mat_CreateVer(filename.c_str(), NULL, MAT_FT_MAT73);
if(matfp == NULL)
{
std::cout << "Unable to create or open Acquisition dump file" << std::endl;
d_dump = false;
}
else
{
size_t dims[2] = {static_cast<size_t>(effective_fft_size), static_cast<size_t>(d_num_doppler_bins)};
matvar_t* matvar = Mat_VarCreate("grid", MAT_C_SINGLE, MAT_T_SINGLE, 2, dims, grid_.memptr(), 0);
Mat_VarWrite(matfp, matvar, MAT_COMPRESSION_ZLIB); // or MAT_COMPRESSION_NONE
Mat_VarFree(matvar);
DLOG(INFO) << "Writing ACQ out to " << filename.str();
dims[0] = static_cast<size_t>(1);
dims[1] = static_cast<size_t>(1);
matvar = Mat_VarCreate("doppler_max", MAT_C_SINGLE, MAT_T_UINT32, 1, dims, &d_doppler_max, 0);
Mat_VarWrite(matfp, matvar, MAT_COMPRESSION_ZLIB); // or MAT_COMPRESSION_NONE
Mat_VarFree(matvar);
d_dump_file.open(filename.str().c_str(), std::ios::out | std::ios::binary);
d_dump_file.write(reinterpret_cast<char*>(d_ifft->get_outbuf()), n); //write directly |abs(x)|^2 in this Doppler bin?
d_dump_file.close();
matvar = Mat_VarCreate("doppler_step", MAT_C_SINGLE, MAT_T_UINT32, 1, dims, &d_doppler_step, 0);
Mat_VarWrite(matfp, matvar, MAT_COMPRESSION_ZLIB); // or MAT_COMPRESSION_NONE
Mat_VarFree(matvar);
Mat_Close(matfp);
}
}
}
}
lk.lock();

45
src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition_cc.h
View File

@@ -58,6 +58,8 @@
#include <gnuradio/gr_complex.h>
#include <gnuradio/fft/fft.h>
#include "gnss_synchro.h"
#include <glog/logging.h>
#include <armadillo>
class pcps_acquisition_cc;
@@ -80,6 +82,7 @@ pcps_make_acquisition_cc(unsigned int sampled_ms, unsigned int max_dwells,
class pcps_acquisition_cc: public gr::block
{
private:
friend pcps_acquisition_cc_sptr
pcps_make_acquisition_cc(unsigned int sampled_ms, unsigned int max_dwells,
unsigned int doppler_max, long freq, long fs_in,
@@ -102,49 +105,47 @@ private:
void acquisition_core( unsigned long int samp_count );
void send_negative_acquisition();
void send_positive_acquisition();
bool d_bit_transition_flag;
bool d_use_CFAR_algorithm_flag;
bool d_active;
bool d_dump;
bool d_worker_active;
bool d_blocking;
float d_threshold;
float d_mag;
float d_input_power;
float d_test_statistics;
float* d_magnitude;
long d_fs_in;
long d_freq;
long d_old_freq;
int d_samples_per_ms;
int d_samples_per_code;
//unsigned int d_doppler_resolution;
float d_threshold;
int d_state;
unsigned int d_channel;
unsigned int d_doppler_max;
unsigned int d_doppler_step;
unsigned int d_sampled_ms;
unsigned int d_max_dwells;
unsigned int d_well_count;
unsigned int d_fft_size;
unsigned int d_num_doppler_bins;
unsigned int d_code_phase;
unsigned long int d_sample_counter;
gr_complex** d_grid_doppler_wipeoffs;
unsigned int d_num_doppler_bins;
gr_complex* d_fft_codes;
gr_complex* d_data_buffer;
gr::fft::fft_complex* d_fft_if;
gr::fft::fft_complex* d_ifft;
Gnss_Synchro* d_gnss_synchro;
unsigned int d_code_phase;
float d_doppler_freq;
float d_mag;
float* d_magnitude;
float d_input_power;
float d_test_statistics;
bool d_bit_transition_flag;
bool d_use_CFAR_algorithm_flag;
std::ofstream d_dump_file;
bool d_active;
int d_state;
bool d_dump;
unsigned int d_channel;
std::string d_dump_filename;
bool d_worker_active;
bool d_blocking;
gr_complex *d_data_buffer;
arma::fmat grid_;
public:
/*!
* \brief Default destructor.
*/
~pcps_acquisition_cc();
/*!

2
src/tests/unit-tests/signal-processing-blocks/acquisition/galileo_e1_pcps_ambiguous_acquisition_test.cc
View File

@@ -158,7 +158,7 @@ void GalileoE1PcpsAmbiguousAcquisitionTest::init()
{
config->set_property("Acquisition_1B.dump", "false");
}
config->set_property("Acquisition_1B.dump_filename", "./tmp-acq-gal1/acquisition.dat");
config->set_property("Acquisition_1B.dump_filename", "./tmp-acq-gal1/acquisition");
config->set_property("Acquisition_1B.threshold", "0.0001");
config->set_property("Acquisition_1B.doppler_max", std::to_string(doppler_max));
config->set_property("Acquisition_1B.doppler_step", std::to_string(doppler_step));

2
src/tests/unit-tests/signal-processing-blocks/acquisition/glonass_l1_ca_pcps_acquisition_test.cc
View File

@@ -141,7 +141,7 @@ void GlonassL1CaPcpsAcquisitionTest::init()
config->set_property("Acquisition_1G.if", "9540000");
config->set_property("Acquisition_1G.coherent_integration_time_ms", "1");
config->set_property("Acquisition_1G.dump", "true");
config->set_property("Acquisition_1G.dump_filename", "./acquisition.dat");
config->set_property("Acquisition_1G.dump_filename", "./acquisition");
config->set_property("Acquisition_1G.implementation", "Glonass_L1_CA_PCPS_Acquisition");
config->set_property("Acquisition_1G.threshold", "0.001");
config->set_property("Acquisition_1G.doppler_max", "5000");

2
src/tests/unit-tests/signal-processing-blocks/acquisition/gps_l1_ca_pcps_acquisition_test.cc
View File

@@ -157,7 +157,7 @@ void GpsL1CaPcpsAcquisitionTest::init()
{
config->set_property("Acquisition_1C.dump", "false");
}
config->set_property("Acquisition_1C.dump_filename", "./tmp-acq-gps1/acquisition.dat");
config->set_property("Acquisition_1C.dump_filename", "./tmp-acq-gps1/acquisition");
config->set_property("Acquisition_1C.threshold", "0.00001");
config->set_property("Acquisition_1C.doppler_max", std::to_string(doppler_max));
config->set_property("Acquisition_1C.doppler_step", std::to_string(doppler_step));

7
src/tests/unit-tests/signal-processing-blocks/acquisition/gps_l2_m_pcps_acquisition_test.cc
View File

@@ -164,7 +164,7 @@ void GpsL2MPcpsAcquisitionTest::init()
{
config->set_property("Acquisition_2S.dump", "false");
}
config->set_property("Acquisition_2S.dump_filename", "./tmp-acq-gps2/acquisition.dat");
config->set_property("Acquisition_2S.dump_filename", "./tmp-acq-gps2/acquisition");
config->set_property("Acquisition_2S.threshold", "0.001");
config->set_property("Acquisition_2S.doppler_max", std::to_string(doppler_max));
config->set_property("Acquisition_2S.doppler_step", std::to_string(doppler_step));
@@ -178,9 +178,8 @@ void GpsL2MPcpsAcquisitionTest::plot_grid()
std::string basename = "./tmp-acq-gps2/acquisition_G_2S";
unsigned int sat = static_cast<unsigned int>(gnss_synchro.PRN);
unsigned int samples_per_code = static_cast<unsigned int>(floor(sampling_frequency_hz / (GPS_L2_M_CODE_RATE_HZ / GPS_L2_M_CODE_LENGTH_CHIPS)) - 1000); // !!
unsigned int samples_per_code = static_cast<unsigned int>(floor(static_cast<double>(sampling_frequency_hz) / (GPS_L2_M_CODE_RATE_HZ / static_cast<double>(GPS_L2_M_CODE_LENGTH_CHIPS))));
acquisition_dump_reader acq_dump(basename, sat, doppler_max, doppler_step, samples_per_code);
if(!acq_dump.read_binary_acq()) std::cout << "Error reading files" << std::endl;
std::vector<int> *doppler = &acq_dump.doppler;
@@ -204,7 +203,7 @@ void GpsL2MPcpsAcquisitionTest::plot_grid()
std::string gnuplot_path = dir.native();
Gnuplot::set_GNUPlotPath(gnuplot_path);
Gnuplot g1("lines");
Gnuplot g1("impulses");
g1.set_title("GPS L2CM signal acquisition for satellite PRN #" + std::to_string(gnss_synchro.PRN));
g1.set_xlabel("Doppler [Hz]");
g1.set_ylabel("Sample");

1
src/tests/unit-tests/signal-processing-blocks/libs/CMakeLists.txt
View File

@@ -30,6 +30,7 @@ include_directories(
${CMAKE_CURRENT_SOURCE_DIR}
${GLOG_INCLUDE_DIRS}
${GFlags_INCLUDE_DIRS}
${MATIO_INCLUDE_DIRS}
)

95
src/tests/unit-tests/signal-processing-blocks/libs/acquisition_dump_reader.cc
View File

@@ -1,11 +1,13 @@
/*!
* \file acquisition_dump_reader.cc
* \brief Helper file for unit testing
* \author Carles Fernandez-Prades, 2017. cfernandez(at)cttc.es
* \authors Carles Fernandez-Prades, 2017. cfernandez(at)cttc.es
* Antonio Ramos, 2018. antonio.ramos(at)cttc.es
*
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2017 (see AUTHORS file for a list of contributors)
* Copyright (C) 2010-2018 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
@@ -28,44 +30,65 @@
* -------------------------------------------------------------------------
*/
#include <complex>
#include <iostream>
#include <cmath>
#include <matio.h>
#include "acquisition_dump_reader.h"
bool acquisition_dump_reader::read_binary_acq()
{
std::complex<float>* aux = new std::complex<float>[1];
for(unsigned int i = 0; i < d_num_doppler_bins; i++)
mat_t* matfile = Mat_Open(d_dump_filename.c_str(), MAT_ACC_RDONLY);
if( matfile == NULL)
{
try
{
std::ifstream ifs;
ifs.exceptions( std::ifstream::failbit | std::ifstream::badbit );
ifs.open(d_dump_filenames.at(i).c_str(), std::ios::in | std::ios::binary);
d_dump_files.at(i).swap(ifs);
if (d_dump_files.at(i).is_open())
{
for(unsigned int k = 0; k < d_samples_per_code; k++)
{
d_dump_files.at(i).read(reinterpret_cast<char *>(&aux[0]), sizeof(std::complex<float>));
mag.at(i).at(k) = std::abs(*aux) / std::pow(d_samples_per_code, 2);
}
}
else
{
std::cout << "File " << d_dump_filenames.at(i).c_str() << " not found." << std::endl;
delete[] aux;
std::cout << "¡¡¡Unreachable Acquisition dump file!!!" << std::endl;
return false;
}
d_dump_files.at(i).close();
}
catch (const std::ifstream::failure &e)
matvar_t* var_= Mat_VarRead(matfile, "grid");
if( var_ == NULL)
{
std::cout << e.what() << std::endl;
delete[] aux;
std::cout << "¡¡¡Unreachable grid variable into Acquisition dump file!!!" << std::endl;
Mat_Close(matfile);
return false;
}
if(var_->rank != 2)
{
std::cout << "Invalid Acquisition dump file: rank error" << std::endl;
Mat_VarFree(var_);
Mat_Close(matfile);
return false;
}
delete[] aux;
if((var_->dims[0] != d_samples_per_code) or (var_->dims[1] != d_num_doppler_bins))
{
std::cout << "Invalid Acquisition dump file: dimension matrix error" << std::endl;
if(var_->dims[0] != d_samples_per_code) std::cout << "Expected " << d_samples_per_code << " samples per code. Obtained " << var_->dims[0] << std::endl;
if(var_->dims[1] != d_num_doppler_bins) std::cout << "Expected " << d_num_doppler_bins << " Doppler bins. Obtained " << var_->dims[1] << std::endl;
Mat_VarFree(var_);
Mat_Close(matfile);
return false;
}
if(var_->data_type != MAT_T_SINGLE)
{
std::cout << "Invalid Acquisition dump file: data type error" << std::endl;
Mat_VarFree(var_);
Mat_Close(matfile);
return false;
}
std::vector<std::vector<float> >::iterator it1;
std::vector<float>::iterator it2;
float* aux = static_cast<float*>(var_->data);
int k = 0;
float normalization_factor = std::pow(d_samples_per_code, 2);
for(it1 = mag.begin(); it1 != mag.end(); it1++)
{
for(it2 = it1->begin(); it2 != it1->end(); it2++)
{
*it2 = static_cast<float>(std::sqrt(aux[k])) / normalization_factor;
k++;
}
}
Mat_VarFree(var_);
Mat_Close(matfile);
return true;
}
@@ -80,12 +103,10 @@ acquisition_dump_reader::acquisition_dump_reader(const std::string & basename, u
d_num_doppler_bins = static_cast<unsigned int>(ceil( static_cast<double>(static_cast<int>(d_doppler_max) - static_cast<int>(-d_doppler_max)) / static_cast<double>(d_doppler_step)));
std::vector<std::vector<float> > mag_aux(d_num_doppler_bins, std::vector<float>(d_samples_per_code));
mag = mag_aux;
d_dump_filename = d_basename + "_sat_" + std::to_string(d_sat) + ".mat";
for (unsigned int doppler_index = 0; doppler_index < d_num_doppler_bins; doppler_index++)
{
doppler.push_back(-static_cast<int>(d_doppler_max) + d_doppler_step * doppler_index);
d_dump_filenames.push_back(d_basename + "_sat_" + std::to_string(d_sat) + "_doppler_" + std::to_string(doppler.at(doppler_index)) + ".dat");
std::ifstream ifs;
d_dump_files.push_back(std::move(ifs));
}
for (unsigned int k = 0; k < d_samples_per_code; k++)
{
@@ -95,12 +116,4 @@ acquisition_dump_reader::acquisition_dump_reader(const std::string & basename, u
acquisition_dump_reader::~acquisition_dump_reader()
{
for(unsigned int i = 0; i < d_num_doppler_bins; i++)
{
if (d_dump_files.at(i).is_open() == true)
{
d_dump_files.at(i).close();
}
}
}
{}

10
src/tests/unit-tests/signal-processing-blocks/libs/acquisition_dump_reader.h
View File

@@ -1,11 +1,12 @@
/*!
* \file acquisition_dump_reader.h
* \brief Helper file for unit testing
* \author Carles Fernandez-Prades, 2017. cfernandez(at)cttc.es
* \authors Carles Fernandez-Prades, 2017. cfernandez(at)cttc.es
* Antonio Ramos, 2018. antonio.ramos(at)cttc.es
*
* -------------------------------------------------------------------------
*
* Copyright (C) 2010-2017 (see AUTHORS file for a list of contributors)
* Copyright (C) 2010-2018 (see AUTHORS file for a list of contributors)
*
* GNSS-SDR is a software defined Global Navigation
* Satellite Systems receiver
@@ -31,8 +32,6 @@
#ifndef GNSS_SDR_ACQUISITION_DUMP_READER_H
#define GNSS_SDR_ACQUISITION_DUMP_READER_H
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
@@ -54,8 +53,7 @@ private:
unsigned int d_doppler_step;
unsigned int d_samples_per_code;
unsigned int d_num_doppler_bins;
std::vector<std::string> d_dump_filenames;
std::vector<std::ifstream> d_dump_files;
std::string d_dump_filename;
};
#endif // GNSS_SDR_ACQUISITION_DUMP_READER_H

116
src/utils/matlab/plot_acq_grid.m Normal file
View File

@@ -0,0 +1,116 @@
% /*!
% * \file plot_acq_grid.m
% * \brief Read GNSS-SDR Acquisition dump .mat file using the provided
% function and plot acquisition grid of acquisition statistic of PRN sat
%
%
% * \author Antonio Ramos, 2017. antonio.ramos(at)cttc.es
% * -------------------------------------------------------------------------
% *
% * Copyright (C) 2010-2017 (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 <http://www.gnu.org/licenses/>.
% *
% * -------------------------------------------------------------------------
% */
%%%%%%%%% ¡¡¡ CONFIGURE !!! %%%%%%%%%%%%%
path = '/archive/';
file = 'acq';
sat = 7;
% Signal:
% 1 GPS L1
% 2 GPS L2M
% 3 GPS L5
% 4 Gal. E1B
% 5 Gal. E5
% 6 Glo. 1G
signal_type = 1;
%%% True for light grid representation
lite_view = true;
%%% If lite_view, it sets the number of samples per chip in the graphical representation
n_samples_per_chip = 3;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
switch(signal_type)
case 1
n_chips = 1023;
system = 'G';
signal = '1C';
case 2
n_chips = 10230;
system = 'G';
signal = '2S';
case 3
n_chips = 10230;
system = 'G';
signal = 'L5';
case 4
n_chips = 4092;
system = 'E';
signal = '1B';
case 5
n_chips = 10230;
system = 'E';
signal = '5X';
case 6
n_chips = 511;
system = 'R';
signal = '1G';
end
filename = [path file '_' system '_' signal '_sat_' num2str(sat) '.mat'];
load(filename);
[n_fft n_dop_bins] = size(grid);
[d_max f_max] = find(grid == max(max(grid)));
freq = (0 : n_dop_bins - 1) * doppler_step - doppler_max;
delay = (0 : n_fft - 1) / n_fft * n_chips;
figure(1)
if(lite_view == false)
surf(freq, delay, grid, 'FaceColor', 'interp', 'LineStyle', 'none')
ylim([min(delay) max(delay)])
else
delay_interp = (0 : n_samples_per_chip * n_chips - 1) / n_samples_per_chip;
grid_interp = spline(delay, grid', delay_interp)';
surf(freq, delay_interp, grid_interp, 'FaceColor', 'interp', 'LineStyle', 'none')
ylim([min(delay_interp) max(delay_interp)])
end
xlabel('Doppler shift / Hz')
xlim([min(freq) max(freq)])
ylabel('Code delay / chips')
zlabel('Test statistics')
figure(2)
subplot(2,1,1)
plot(freq, grid(d_max, :))
xlim([min(freq) max(freq)])
xlabel('Doppler shift / Hz')
ylabel('Test statistics')
title(['Fixed code delay to ' num2str((d_max - 1) / n_fft * n_chips) ' chips'])
subplot(2,1,2)
plot(delay, grid(:, f_max))
xlim([min(delay) max(delay)])
xlabel('Code delay / chips')
ylabel('Test statistics')
title(['Doppler wipe-off = ' num2str((f_max - 1) * doppler_step - doppler_max) ' Hz'])