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

CMakeLists.txt

@@ -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}

src/algorithms/acquisition/gnuradio_blocks/CMakeLists.txt

@@ -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)

src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition_cc.cc

@@ -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;
+                memcpy(grid_.colptr(doppler_index), d_magnitude, sizeof(float) * effective_fft_size);
-                    std::streamsize n = 2 * sizeof(float) * (d_fft_size); // complex file write
+                if(doppler_index == (d_num_doppler_bins - 1))
-                    filename.str("");
+                {
-                    boost::filesystem::path p = d_dump_filename;
+                    std::string filename = d_dump_filename;
-                    filename << p.parent_path().string()
+                    filename.append("_");
-                            << boost::filesystem::path::preferred_separator
+                    filename.append(1, d_gnss_synchro->System);
-                            << p.stem().string()
+                    filename.append("_");
-                            << "_" << d_gnss_synchro->System
+                    filename.append(1, d_gnss_synchro->Signal[0]);
-                            <<"_" << d_gnss_synchro->Signal << "_sat_"
+                    filename.append(1, d_gnss_synchro->Signal[1]);
-                            << d_gnss_synchro->PRN << "_doppler_"
+                    filename.append("_sat_");
-                            <<  doppler
+                    filename.append(std::to_string(d_gnss_synchro->PRN));
-                            << p.extension().string();
+                    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);
+                        matvar = Mat_VarCreate("doppler_step", MAT_C_SINGLE, MAT_T_UINT32, 1, dims, &d_doppler_step, 0);
-                    d_dump_file.write(reinterpret_cast<char*>(d_ifft->get_outbuf()), n); //write directly |abs(x)|^2 in this Doppler bin?
+                        Mat_VarWrite(matfp, matvar, MAT_COMPRESSION_ZLIB); // or MAT_COMPRESSION_NONE
-                    d_dump_file.close();
+                        Mat_VarFree(matvar);
+
+                        Mat_Close(matfp);
+                    }
+                }
             }
         }
     lk.lock();

src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition_cc.h

@@ -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;
+    int d_state;
-    float d_threshold;
+    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;
+    arma::fmat grid_;
-    bool d_blocking;
-    gr_complex *d_data_buffer;
 
 public:
-    /*!
+
-     * \brief Default destructor.
-     */
     ~pcps_acquisition_cc();
 
      /*!

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

@@ -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));

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

@@ -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");

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

@@ -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));

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

@@ -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");

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

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

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

@@ -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];
+    mat_t* matfile = Mat_Open(d_dump_filename.c_str(), MAT_ACC_RDONLY);
-    for(unsigned int i = 0; i < d_num_doppler_bins; i++)
+    if( matfile == NULL)
     {
-            try
+        std::cout << "¡¡¡Unreachable Acquisition dump file!!!" << std::endl;
-            {
-                    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;
         return false;
     }
-                    d_dump_files.at(i).close();
+    matvar_t* var_= Mat_VarRead(matfile, "grid");
-            }
+    if( var_ == NULL)
-            catch (const std::ifstream::failure &e)
     {
-                    std::cout << e.what() << std::endl;
+        std::cout << "¡¡¡Unreachable grid variable into Acquisition dump file!!!" << std::endl;
-                    delete[] aux;
+        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();
-                }
-        }
-}

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

@@ -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::string d_dump_filename;
-    std::vector<std::ifstream> d_dump_files;
 };
 
 #endif // GNSS_SDR_ACQUISITION_DUMP_READER_H

src/utils/matlab/plot_acq_grid.m

@@ -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'])