Extend GPS L1 CA Pull-in test to support external signal file. Add GNUPlot interface function to disable the screen output

src/tests/common-files/gnuplot_i.h

@@ -218,6 +218,7 @@ public:
         const std::string &labely = "y",
         const std::string &labelz = "z");
 
+
     /// destructor: needed to delete temporary files
     ~Gnuplot();
 
@@ -246,6 +247,9 @@ public:
     /// sets terminal type to terminal_std
     Gnuplot &showonscreen();  // window output is set by default (win/x11/aqua)
 
+    /// sets terminal type to unknown (disable the screen output)
+    Gnuplot &disablescreen();
+
     /// saves a gnuplot session to a postscript file, filename without extension
     Gnuplot &savetops(const std::string &filename = "gnuplot_output");
 
@@ -1195,6 +1199,17 @@ Gnuplot &Gnuplot::set_smooth(const std::string &stylestr)
 }
 
 
+//------------------------------------------------------------------------------
+//
+// Disable screen output
+//
+Gnuplot &Gnuplot::disablescreen()
+{
+    cmd("set output");
+    cmd("set terminal unknown");
+    return *this;
+}
+
 //------------------------------------------------------------------------------
 //
 // sets terminal type to windows / x11

src/tests/unit-tests/signal-processing-blocks/tracking/gps_l1_ca_dll_pll_tracking_pull-in_test.cc

@@ -44,6 +44,7 @@
 #include "GPS_L1_CA.h"
 #include "gnss_block_factory.h"
 #include "tracking_interface.h"
+#include "gps_l1_ca_pcps_acquisition_fine_doppler.h"
 #include "in_memory_configuration.h"
 #include "tracking_true_obs_reader.h"
 #include "tracking_dump_reader.h"
@@ -52,7 +53,59 @@
 #include "test_flags.h"
 #include "tracking_tests_flags.h"
 
-// ######## GNURADIO BLOCK MESSAGE RECEVER #########
+
+// ######## GNURADIO ACQUISITION BLOCK MESSAGE RECEVER #########
+class Acquisition_msg_rx;
+
+typedef boost::shared_ptr<Acquisition_msg_rx> Acquisition_msg_rx_sptr;
+
+Acquisition_msg_rx_sptr Acquisition_msg_rx_make();
+
+
+class Acquisition_msg_rx : public gr::block
+{
+private:
+    friend Acquisition_msg_rx_sptr Acquisition_msg_rx_make();
+    void msg_handler_events(pmt::pmt_t msg);
+    Acquisition_msg_rx();
+
+public:
+    int rx_message;
+    ~Acquisition_msg_rx();  //!< Default destructor
+};
+
+
+Acquisition_msg_rx_sptr Acquisition_msg_rx_make()
+{
+    return Acquisition_msg_rx_sptr(new Acquisition_msg_rx());
+}
+
+
+void Acquisition_msg_rx::msg_handler_events(pmt::pmt_t msg)
+{
+    try
+        {
+            long int message = pmt::to_long(msg);
+            rx_message = message;
+        }
+    catch (boost::bad_any_cast& e)
+        {
+            LOG(WARNING) << "msg_handler_acquisition Bad cast!\n";
+            rx_message = 0;
+        }
+}
+
+
+Acquisition_msg_rx::Acquisition_msg_rx() : gr::block("Acquisition_msg_rx", gr::io_signature::make(0, 0, 0), gr::io_signature::make(0, 0, 0))
+{
+    this->message_port_register_in(pmt::mp("events"));
+    this->set_msg_handler(pmt::mp("events"), boost::bind(&Acquisition_msg_rx::msg_handler_events, this, _1));
+    rx_message = 0;
+}
+
+
+Acquisition_msg_rx::~Acquisition_msg_rx() {}
+// ######## GNURADIO TRACKING BLOCK MESSAGE RECEVER #########
 class GpsL1CADllPllTrackingPullInTest_msg_rx;
 
 typedef boost::shared_ptr<GpsL1CADllPllTrackingPullInTest_msg_rx> GpsL1CADllPllTrackingPullInTest_msg_rx_sptr;
@@ -88,7 +141,7 @@ void GpsL1CADllPllTrackingPullInTest_msg_rx::msg_handler_events(pmt::pmt_t msg)
         }
     catch (boost::bad_any_cast& e)
         {
-            LOG(WARNING) << "msg_handler_telemetry Bad any cast!";
+            LOG(WARNING) << "msg_handler_tracking Bad cast!";
             rx_message = 0;
         }
 }
@@ -126,6 +179,10 @@ public:
     std::string filename_rinex_obs = FLAGS_filename_rinex_obs;
     std::string filename_raw_data = FLAGS_filename_raw_data;
 
+    std::map<int, double> doppler_measurements_map;
+    std::map<int, double> code_delay_measurements_map;
+    std::map<int, unsigned long int> acq_samplestamp_map;
+
     int configure_generator(double CN0_dBHz, int file_idx);
     int generate_signal();
     std::vector<double> check_results_doppler(arma::vec& true_time_s,
@@ -165,6 +222,7 @@ public:
         double DLL_narrow_bw_hz,
         int extend_correlation_symbols);
 
+    bool acquire_GPS_L1CA_signal(int SV_ID);
     gr::top_block_sptr top_block;
     std::shared_ptr<GNSSBlockFactory> factory;
     std::shared_ptr<InMemoryConfiguration> config;
@@ -259,12 +317,120 @@ void GpsL1CADllPllTrackingPullInTest::configure_receiver(
 }
 
 
+bool GpsL1CADllPllTrackingPullInTest::acquire_GPS_L1CA_signal(int SV_ID)
+{
+    // 1. Setup GNU Radio flowgraph (file_source -> Acquisition_10m)
+    gr::top_block_sptr top_block;
+    top_block = gr::make_top_block("Acquisition test");
+
+    // Satellite signal definition
+    Gnss_Synchro tmp_gnss_synchro;
+    tmp_gnss_synchro.Channel_ID = 0;
+    tmp_gnss_synchro.System = 'G';
+    std::string signal = "1C";
+    signal.copy(tmp_gnss_synchro.Signal, 2, 0);
+    tmp_gnss_synchro.PRN = SV_ID;
+
+    config = std::make_shared<InMemoryConfiguration>();
+    config->set_property("GNSS-SDR.internal_fs_sps", std::to_string(baseband_sampling_freq));
+
+    GNSSBlockFactory block_factory;
+    GpsL1CaPcpsAcquisitionFineDoppler* acquisition;
+    acquisition = new GpsL1CaPcpsAcquisitionFineDoppler(config.get(), "Acquisition", 1, 1);
+
+    acquisition->set_channel(1);
+    acquisition->set_gnss_synchro(&tmp_gnss_synchro);
+    acquisition->set_threshold(config->property("Acquisition.threshold", 0.05));
+    acquisition->set_doppler_max(config->property("Acquisition.doppler_max", 10000));
+    acquisition->set_doppler_step(config->property("Acquisition.doppler_step", 250));
+
+    boost::shared_ptr<Acquisition_msg_rx> msg_rx;
+    try
+        {
+            msg_rx = Acquisition_msg_rx_make();
+        }
+    catch (const std::exception& e)
+        {
+            std::cout << "Failure connecting the message port system: " << e.what() << std::endl;
+            exit(0);
+        }
+
+    gr::blocks::file_source::sptr file_source;
+    std::string file = FLAGS_filename_raw_data;
+    const char* file_name = file.c_str();
+    file_source = gr::blocks::file_source::make(sizeof(int8_t), file_name, false);
+    gr::blocks::interleaved_char_to_complex::sptr gr_interleaved_char_to_complex = gr::blocks::interleaved_char_to_complex::make();
+    gr::blocks::null_sink::sptr sink = gr::blocks::null_sink::make(sizeof(Gnss_Synchro));
+    top_block->connect(file_source, 0, gr_interleaved_char_to_complex, 0);
+    top_block->connect(gr_interleaved_char_to_complex, 0, acquisition->get_left_block(), 0);
+    top_block->msg_connect(acquisition->get_left_block(), pmt::mp("events"), msg_rx, pmt::mp("events"));
+
+    // 5. Run the flowgraph
+    // Get visible GPS satellites (positive acquisitions with Doppler measurements)
+    // record startup time
+    std::chrono::time_point<std::chrono::system_clock> start, end;
+    std::chrono::duration<double> elapsed_seconds;
+    start = std::chrono::system_clock::now();
+
+    bool start_msg = true;
+
+    doppler_measurements_map.clear();
+    code_delay_measurements_map.clear();
+    acq_samplestamp_map.clear();
+
+    for (unsigned int PRN = 1; PRN < 33; PRN++)
+        {
+            tmp_gnss_synchro.PRN = PRN;
+            acquisition->set_gnss_synchro(&tmp_gnss_synchro);
+            acquisition->init();
+            acquisition->set_local_code();
+            acquisition->reset();
+            msg_rx->rx_message = 0;
+            top_block->run();
+            if (start_msg == true)
+                {
+                    std::cout << "Reading external signal file: " << FLAGS_filename_raw_data << std::endl;
+                    std::cout << "Searching for GPS Satellites in L1 band..." << std::endl;
+                    std::cout << "[";
+                    start_msg = false;
+                }
+            while (msg_rx->rx_message == 0)
+                {
+                    usleep(100000);
+                }
+            if (msg_rx->rx_message == 1)
+                {
+                    std::cout << " " << PRN << " ";
+                    doppler_measurements_map.insert(std::pair<int, double>(PRN, tmp_gnss_synchro.Acq_doppler_hz));
+                    code_delay_measurements_map.insert(std::pair<int, double>(PRN, tmp_gnss_synchro.Acq_delay_samples));
+                    acq_samplestamp_map.insert(std::pair<int, double>(PRN, tmp_gnss_synchro.Acq_samplestamp_samples));
+                }
+            else
+                {
+                    std::cout << " . ";
+                }
+            top_block->stop();
+            file_source->seek(0, 0);
+            std::cout.flush();
+        }
+    std::cout << "]" << std::endl;
+
+    // report the elapsed time
+    end = std::chrono::system_clock::now();
+    elapsed_seconds = end - start;
+    std::cout << "Total signal acquisition run time "
+              << elapsed_seconds.count()
+              << " [seconds]" << std::endl;
+    return true;
+}
+
 TEST_F(GpsL1CADllPllTrackingPullInTest, ValidationOfResults)
 {
     //*************************************************
-    //***** STEP 2: Prepare the parameters sweep ******
+    //***** STEP 1: Prepare the parameters sweep ******
     //*************************************************
-    std::vector<double> acq_doppler_error_hz_values;
+    std::vector<double>
+        acq_doppler_error_hz_values;
     std::vector<std::vector<double>> acq_delay_error_chips_values;  //vector of vector
 
     for (double doppler_hz = FLAGS_Acq_Doppler_error_hz_start; doppler_hz >= FLAGS_Acq_Doppler_error_hz_stop; doppler_hz = doppler_hz + FLAGS_Acq_Doppler_error_hz_step)
@@ -280,10 +446,12 @@ TEST_F(GpsL1CADllPllTrackingPullInTest, ValidationOfResults)
         }
 
 
-    //*********************************************
+    //***********************************************************
-    //***** STEP 3: Generate the input signal *****
+    //***** STEP 2: Generate the input signal (if required) *****
-    //*********************************************
+    //***********************************************************
     std::vector<double> generator_CN0_values;
+    if (FLAGS_enable_external_signal_file)
+        {
             if (FLAGS_CN0_dBHz_start == FLAGS_CN0_dBHz_stop)
                 {
                     generator_CN0_values.push_back(FLAGS_CN0_dBHz_start);
@@ -295,11 +463,19 @@ TEST_F(GpsL1CADllPllTrackingPullInTest, ValidationOfResults)
                             generator_CN0_values.push_back(cn0);
                         }
                 }
+        }
+    else
+        {
+            generator_CN0_values.push_back(999);  // an external input signal capture is selected, no CN0 information available
+        }
 
     // use generator or use an external capture file
     if (FLAGS_enable_external_signal_file)
         {
-            //todo: create and configure an acquisition block and perform an acquisition to obtain the synchronization parameters
+            //create and configure an acquisition block and perform an acquisition to obtain the synchronization parameters
+            ASSERT_EQ(acquire_GPS_L1CA_signal(FLAGS_test_satellite_PRN), true);
+            EXPECT_TRUE(doppler_measurements_map.find(FLAGS_test_satellite_PRN) != doppler_measurements_map.end())
+                << "Error: satellite SV: " << FLAGS_test_satellite_PRN << " is not acquired";
         }
     else
         {
@@ -326,6 +502,10 @@ TEST_F(GpsL1CADllPllTrackingPullInTest, ValidationOfResults)
     //***** Obtain the initial signal sinchronization parameters (emulating an acquisition) ****
     //******************************************************************************************
     int test_satellite_PRN = 0;
+    double true_acq_doppler_hz = 0.0;
+    double true_acq_delay_samples = 0.0;
+    unsigned long int acq_samplestamp_samples = 0;
+
     tracking_true_obs_reader true_obs_data;
     if (!FLAGS_enable_external_signal_file)
         {
@@ -341,14 +521,21 @@ TEST_F(GpsL1CADllPllTrackingPullInTest, ValidationOfResults)
                 << "Maybe sat PRN #" + std::to_string(FLAGS_test_satellite_PRN) +
                        " is not available?";
             std::cout << "Testing satellite PRN=" << test_satellite_PRN << std::endl;
-            std::cout << "True Initial Doppler [Hz]=" << true_obs_data.doppler_l1_hz << " rue Initial code delay [Chips]=" << true_obs_data.prn_delay_chips << std::endl;
+            std::cout << "True Initial Doppler " << true_obs_data.doppler_l1_hz << "[Hz], true Initial code delay [Chips]=" << true_obs_data.prn_delay_chips << "[Chips]" << std::endl;
+            true_acq_doppler_hz = true_obs_data.doppler_l1_hz;
+            true_acq_delay_samples = (GPS_L1_CA_CODE_LENGTH_CHIPS - true_obs_data.prn_delay_chips / GPS_L1_CA_CODE_LENGTH_CHIPS) * static_cast<double>(baseband_sampling_freq) * GPS_L1_CA_CODE_PERIOD;
+            acq_samplestamp_samples = 0;
         }
     else
         {
-            //todo: Simulate a perfect acquisition for the external capture file
+            true_acq_doppler_hz = doppler_measurements_map.find(FLAGS_test_satellite_PRN)->second;
+            true_acq_delay_samples = code_delay_measurements_map.find(FLAGS_test_satellite_PRN)->second;
+            acq_samplestamp_samples = 0;  //acq_samplestamp_map.find(FLAGS_test_satellite_PRN)->second;
+            std::cout << "Estimated Initial Doppler " << true_acq_doppler_hz << "[Hz], estimated Initial code delay " << true_acq_delay_samples << " [Samples]" << std::endl;
         }
     //CN0 LOOP
     std::vector<std::vector<double>> pull_in_results_v_v;
+
     for (unsigned int current_cn0_idx = 0; current_cn0_idx < generator_CN0_values.size(); current_cn0_idx++)
         {
             std::vector<double> pull_in_results_v;
@@ -356,23 +543,18 @@ TEST_F(GpsL1CADllPllTrackingPullInTest, ValidationOfResults)
                 {
                     for (unsigned int current_acq_code_error_idx = 0; current_acq_code_error_idx < acq_delay_error_chips_values.at(current_acq_doppler_error_idx).size(); current_acq_code_error_idx++)
                         {
+                            gnss_synchro.Acq_samplestamp_samples = acq_samplestamp_samples;
                             //simulate a Doppler error in acquisition
-                            double acq_doppler_hz = true_obs_data.doppler_l1_hz + acq_doppler_error_hz_values.at(current_acq_doppler_error_idx);
+                            gnss_synchro.Acq_doppler_hz = true_acq_doppler_hz + acq_doppler_error_hz_values.at(current_acq_doppler_error_idx);
                             //simulate Code Delay error in acquisition
-                            double acq_delay_samples;
+                            gnss_synchro.Acq_delay_samples = true_acq_delay_samples + (acq_delay_error_chips_values.at(current_acq_doppler_error_idx).at(current_acq_code_error_idx) / GPS_L1_CA_CODE_RATE_HZ) * static_cast<double>(baseband_sampling_freq);
-                            acq_delay_samples = (GPS_L1_CA_CODE_LENGTH_CHIPS - true_obs_data.prn_delay_chips / GPS_L1_CA_CODE_LENGTH_CHIPS) * static_cast<double>(baseband_sampling_freq) * GPS_L1_CA_CODE_PERIOD;
-                            acq_delay_samples += (acq_delay_error_chips_values.at(current_acq_doppler_error_idx).at(current_acq_code_error_idx) / GPS_L1_CA_CODE_RATE_HZ) * static_cast<double>(baseband_sampling_freq);
 
                             //create flowgraph
                             top_block = gr::make_top_block("Tracking test");
                             std::shared_ptr<GNSSBlockInterface> trk_ = factory->GetBlock(config, "Tracking_1C", implementation, 1, 1);
                             std::shared_ptr<TrackingInterface> tracking = std::dynamic_pointer_cast<TrackingInterface>(trk_);
-
                             boost::shared_ptr<GpsL1CADllPllTrackingPullInTest_msg_rx> msg_rx = GpsL1CADllPllTrackingPullInTest_msg_rx_make();
 
-                            gnss_synchro.Acq_delay_samples = acq_delay_samples;
-                            gnss_synchro.Acq_doppler_hz = acq_doppler_hz;
-                            gnss_synchro.Acq_samplestamp_samples = 0;
 
                             ASSERT_NO_THROW({
                                 tracking->set_channel(gnss_synchro.Channel_ID);
@@ -386,8 +568,16 @@ TEST_F(GpsL1CADllPllTrackingPullInTest, ValidationOfResults)
                                 tracking->connect(top_block);
                             }) << "Failure connecting tracking to the top_block.";
 
+                            std::string file;
                             ASSERT_NO_THROW({
-                                std::string file = "./" + filename_raw_data + std::to_string(current_cn0_idx);
+                                if (!FLAGS_enable_external_signal_file)
+                                    {
+                                        file = "./" + filename_raw_data + std::to_string(current_cn0_idx);
+                                    }
+                                else
+                                    {
+                                        file = FLAGS_filename_raw_data;
+                                    }
                                 const char* file_name = file.c_str();
                                 gr::blocks::file_source::sptr file_source = gr::blocks::file_source::make(sizeof(int8_t), file_name, false);
                                 gr::blocks::interleaved_char_to_complex::sptr gr_interleaved_char_to_complex = gr::blocks::interleaved_char_to_complex::make();
@@ -396,6 +586,8 @@ TEST_F(GpsL1CADllPllTrackingPullInTest, ValidationOfResults)
                                 top_block->connect(gr_interleaved_char_to_complex, 0, tracking->get_left_block(), 0);
                                 top_block->connect(tracking->get_right_block(), 0, sink, 0);
                                 top_block->msg_connect(tracking->get_right_block(), pmt::mp("events"), msg_rx, pmt::mp("events"));
+
+                                file_source->seek(acq_samplestamp_samples, 0);
                             }) << "Failure connecting the blocks of tracking test.";
 
 
@@ -479,11 +671,19 @@ TEST_F(GpsL1CADllPllTrackingPullInTest, ValidationOfResults)
                                                     Gnuplot::set_GNUPlotPath(gnuplot_path);
                                                     unsigned int decimate = static_cast<unsigned int>(FLAGS_plot_decimate);
 
-                                                    if (FLAGS_plot_detail_level >= 2)
+                                                    if (FLAGS_plot_detail_level >= 2 and FLAGS_show_plots)
                                                         {
                                                             Gnuplot g1("linespoints");
-                                                            if (FLAGS_show_plots) g1.showonscreen();  // window output
+                                                            g1.showonscreen();  // window output
-                                                            g1.set_title(std::to_string(generator_CN0_values.at(current_cn0_idx)) + " dB-Hz, " + "PLL/DLL BW: " + std::to_string(FLAGS_PLL_bw_hz_start) + "," + std::to_string(FLAGS_DLL_bw_hz_start) + " Hz" + "GPS L1 C/A (PRN #" + std::to_string(FLAGS_test_satellite_PRN) + ")");
+                                                            if (!FLAGS_enable_external_signal_file)
+                                                                {
+                                                                    g1.set_title(std::to_string(generator_CN0_values.at(current_cn0_idx)) + " dB-Hz, " + "PLL/DLL BW: " + std::to_string(FLAGS_PLL_bw_hz_start) + "," + std::to_string(FLAGS_DLL_bw_hz_start) + " [Hz], GPS L1 C/A (PRN #" + std::to_string(FLAGS_test_satellite_PRN) + ")");
+                                                                }
+                                                            else
+                                                                {
+                                                                    g1.set_title("D_e=" + std::to_string(acq_doppler_error_hz_values.at(current_acq_doppler_error_idx)) + " [Hz] " + "T_e= " + std::to_string(acq_delay_error_chips_values.at(current_acq_doppler_error_idx).at(current_acq_code_error_idx)) + " [Chips], PLL/DLL BW: " + std::to_string(FLAGS_PLL_bw_hz_start) + "," + std::to_string(FLAGS_DLL_bw_hz_start) + " [Hz], GPS L1 C/A (PRN #" + std::to_string(FLAGS_test_satellite_PRN) + ")");
+                                                                }
+
                                                             g1.set_grid();
                                                             g1.set_xlabel("Time [s]");
                                                             g1.set_ylabel("Correlators' output");
@@ -496,8 +696,16 @@ TEST_F(GpsL1CADllPllTrackingPullInTest, ValidationOfResults)
                                                             //g1.savetopdf("Correlators_outputs" + std::to_string(generator_CN0_values.at(current_cn0_idx)), 18);
 
                                                             Gnuplot g2("points");
-                                                            if (FLAGS_show_plots) g2.showonscreen();  // window output
+                                                            g2.showonscreen();  // window output
-                                                            g2.set_title(std::to_string(generator_CN0_values.at(current_cn0_idx)) + " dB-Hz Constellation " + "PLL/DLL BW: " + std::to_string(FLAGS_PLL_bw_hz_start) + "," + std::to_string(FLAGS_DLL_bw_hz_start) + " Hz" + "GPS L1 C/A (PRN #" + std::to_string(FLAGS_test_satellite_PRN) + ")");
+                                                            if (!FLAGS_enable_external_signal_file)
+                                                                {
+                                                                    g2.set_title(std::to_string(generator_CN0_values.at(current_cn0_idx)) + " dB-Hz Constellation " + "PLL/DLL BW: " + std::to_string(FLAGS_PLL_bw_hz_start) + "," + std::to_string(FLAGS_DLL_bw_hz_start) + " [Hz], GPS L1 C/A (PRN #" + std::to_string(FLAGS_test_satellite_PRN) + ")");
+                                                                }
+                                                            else
+                                                                {
+                                                                    g2.set_title("D_e=" + std::to_string(acq_doppler_error_hz_values.at(current_acq_doppler_error_idx)) + " [Hz] " + "T_e= " + std::to_string(acq_delay_error_chips_values.at(current_acq_doppler_error_idx).at(current_acq_code_error_idx)) + " [Chips], PLL/DLL BW: " + std::to_string(FLAGS_PLL_bw_hz_start) + "," + std::to_string(FLAGS_DLL_bw_hz_start) + " [Hz], GPS L1 C/A (PRN #" + std::to_string(FLAGS_test_satellite_PRN) + ")");
+                                                                }
+
                                                             g2.set_grid();
                                                             g2.set_xlabel("Inphase");
                                                             g2.set_ylabel("Quadrature");
@@ -507,7 +715,14 @@ TEST_F(GpsL1CADllPllTrackingPullInTest, ValidationOfResults)
                                                             //g2.savetopdf("Constellation", 18);
 
                                                             Gnuplot g3("linespoints");
+                                                            if (!FLAGS_enable_external_signal_file)
+                                                                {
                                                                     g3.set_title(std::to_string(generator_CN0_values.at(current_cn0_idx)) + " dB-Hz, GPS L1 C/A tracking CN0 output (PRN #" + std::to_string(FLAGS_test_satellite_PRN) + ")");
+                                                                }
+                                                            else
+                                                                {
+                                                                    g3.set_title("D_e=" + std::to_string(acq_doppler_error_hz_values.at(current_acq_doppler_error_idx)) + " [Hz] " + "T_e= " + std::to_string(acq_delay_error_chips_values.at(current_acq_doppler_error_idx).at(current_acq_code_error_idx)) + " [Chips] PLL/DLL BW: " + std::to_string(FLAGS_PLL_bw_hz_start) + "," + std::to_string(FLAGS_DLL_bw_hz_start) + " [Hz], GPS L1 C/A (PRN #" + std::to_string(FLAGS_test_satellite_PRN) + ")");
+                                                                }
                                                             g3.set_grid();
                                                             g3.set_xlabel("Time [s]");
                                                             g3.set_ylabel("Reported CN0 [dB-Hz]");
@@ -519,7 +734,7 @@ TEST_F(GpsL1CADllPllTrackingPullInTest, ValidationOfResults)
                                                             g3.set_legend();
                                                             //g3.savetops("CN0_output");
                                                             //g3.savetopdf("CN0_output", 18);
-                                                            if (FLAGS_show_plots) g3.showonscreen();  // window output
+                                                            g3.showonscreen();  // window output
                                                         }
                                                 }
                                             catch (const GnuplotException& ge)
@@ -553,21 +768,45 @@ TEST_F(GpsL1CADllPllTrackingPullInTest, ValidationOfResults)
             pull_in_result_mesh = pull_in_results_v_v.at(current_cn0_idx);
             //plot grid
             Gnuplot g4("points palette pointsize 2 pointtype 7");
+            if (FLAGS_show_plots)
+                {
+                    g4.showonscreen();  // window output
+                }
+            else
+                {
+                    g4.disablescreen();
+                }
             g4.cmd("set palette defined ( 0 \"black\", 1 \"green\" )");
             g4.cmd("set key off");
             g4.cmd("set view map");
-            std::string title("Tracking Pull-in result grid at CN0:" + std::to_string(static_cast<int>(round(generator_CN0_values.at(current_cn0_idx)))) + " dB-Hz, PLL/DLL BW: " + std::to_string(FLAGS_PLL_bw_hz_start) + "," + std::to_string(FLAGS_DLL_bw_hz_start) + " Hz.");
+            std::string title;
+            if (!FLAGS_enable_external_signal_file)
+                {
+                    title = std::string("Tracking Pull-in result grid at CN0:" + std::to_string(static_cast<int>(round(generator_CN0_values.at(current_cn0_idx)))) + " [dB-Hz], PLL/DLL BW: " + std::to_string(FLAGS_PLL_bw_hz_start) + "," + std::to_string(FLAGS_DLL_bw_hz_start) + " [Hz].");
+                }
+            else
+                {
+                    title = std::string("Tracking Pull-in result grid, PLL/DLL BW: " + std::to_string(FLAGS_PLL_bw_hz_start) + "," + std::to_string(FLAGS_DLL_bw_hz_start) + " [Hz], GPS L1 C/A (PRN #" + std::to_string(FLAGS_test_satellite_PRN) + ")");
+                }
+
             g4.set_title(title);
             g4.set_grid();
             g4.set_xlabel("Acquisition Doppler error [Hz]");
             g4.set_ylabel("Acquisition Code Delay error [Chips]");
-
+            g4.cmd("set cbrange[0:1]");
             g4.plot_xyz(doppler_error_mesh,
                 code_delay_error_mesh,
                 pull_in_result_mesh);
             g4.set_legend();
+            if (!FLAGS_enable_external_signal_file)
+                {
                     g4.savetops("trk_pull_in_grid_" + std::to_string(static_cast<int>(round(generator_CN0_values.at(current_cn0_idx)))));
                     g4.savetopdf("trk_pull_in_grid_" + std::to_string(static_cast<int>(round(generator_CN0_values.at(current_cn0_idx)))), 12);
-            if (FLAGS_show_plots) g4.showonscreen();  // window output
+                }
+            else
+                {
+                    g4.savetops("trk_pull_in_grid_" + FLAGS_filename_raw_data);
+                    g4.savetopdf("trk_pull_in_grid_" + FLAGS_filename_raw_data, 12);
+                }
         }
 }