From c0375c99ff1d0af815f61651dd489596dc2aa594 Mon Sep 17 00:00:00 2001
From: Javier Arribas <javiarribas@gmail.com>
Date: Mon, 23 Apr 2018 12:37:43 +0200
Subject: [PATCH] Adding GPS L1 C/A CN0 control in GPS DLL/PLL unit test
---
.../gps_l1_ca_dll_pll_tracking_test.cc | 29 ++++++++++++++-----
1 file changed, 22 insertions(+), 7 deletions(-)
diff --git a/src/tests/unit-tests/signal-processing-blocks/tracking/gps_l1_ca_dll_pll_tracking_test.cc b/src/tests/unit-tests/signal-processing-blocks/tracking/gps_l1_ca_dll_pll_tracking_test.cc
index 89f70f914..0d0bf4cf0 100644
--- a/src/tests/unit-tests/signal-processing-blocks/tracking/gps_l1_ca_dll_pll_tracking_test.cc
+++ b/src/tests/unit-tests/signal-processing-blocks/tracking/gps_l1_ca_dll_pll_tracking_test.cc
@@ -54,7 +54,8 @@
#include "test_flags.h"
DEFINE_bool(plot_gps_l1_tracking_test, false, "Plots results of GpsL1CADllPllTrackingTest with gnuplot");
-
+DEFINE_double(CN0_dBHz, std::numeric_limits<double>::infinity(), "Enable noise generator and set the CN0 [dB-Hz]");
+DEFINE_int32(extend_correlation_symbols, 1, "Set the tracking coherent correlation to N symbols (up to 20 for GPS L1 C/A)");
// ######## GNURADIO BLOCK MESSAGE RECEVER #########
class GpsL1CADllPllTrackingTest_msg_rx;
@@ -121,7 +122,7 @@ public:
std::string p3;
std::string p4;
std::string p5;
-
+ std::string p6;
std::string implementation = "GPS_L1_CA_DLL_PLL_Tracking"; //"GPS_L1_CA_DLL_PLL_C_Aid_Tracking";
const int baseband_sampling_freq = FLAGS_fs_gen_sps;
@@ -183,6 +184,7 @@ int GpsL1CADllPllTrackingTest::configure_generator()
p3 = std::string("-rinex_obs_file=") + FLAGS_filename_rinex_obs; // RINEX 2.10 observation file output
p4 = std::string("-sig_out_file=") + FLAGS_filename_raw_data; // Baseband signal output file. Will be stored in int8_t IQ multiplexed samples
p5 = std::string("-sampling_freq=") + std::to_string(baseband_sampling_freq); //Baseband sampling frequency [MSps]
+ p6 = std::string("-CN0_dBHz=") + std::to_string(FLAGS_CN0_dBHz); // Signal generator CN0
return 0;
}
@@ -191,7 +193,7 @@ int GpsL1CADllPllTrackingTest::generate_signal()
{
int child_status;
- char* const parmList[] = {&generator_binary[0], &generator_binary[0], &p1[0], &p2[0], &p3[0], &p4[0], &p5[0], NULL};
+ char* const parmList[] = {&generator_binary[0], &generator_binary[0], &p1[0], &p2[0], &p3[0], &p4[0], &p5[0],&p6[0], NULL};
int pid;
if ((pid = fork()) == -1)
@@ -223,12 +225,12 @@ void GpsL1CADllPllTrackingTest::configure_receiver()
config->set_property("Tracking_1C.implementation", implementation);
config->set_property("Tracking_1C.item_type", "gr_complex");
config->set_property("Tracking_1C.pll_bw_hz", "20.0");
- config->set_property("Tracking_1C.dll_bw_hz", "2.0");
+ config->set_property("Tracking_1C.dll_bw_hz", "1.5");
config->set_property("Tracking_1C.early_late_space_chips", "0.5");
- config->set_property("Tracking_1C.pll_bw_narrow_hz", "20.0");
- config->set_property("Tracking_1C.dll_bw_narrow_hz", "2.0");
+ config->set_property("Tracking_1C.extend_correlation_symbols", std::to_string(FLAGS_extend_correlation_symbols));
+ config->set_property("Tracking_1C.pll_bw_narrow_hz", "2.0");
+ config->set_property("Tracking_1C.dll_bw_narrow_hz", "1.0");
config->set_property("Tracking_1C.early_late_space_narrow_chips", "0.5");
- config->set_property("Tracking_1C.extend_correlation_ms", "1");
config->set_property("Tracking_1C.dump", "true");
config->set_property("Tracking_1C.dump_filename", "./tracking_ch_");
}
@@ -471,6 +473,7 @@ TEST_F(GpsL1CADllPllTrackingTest, ValidationOfResults)
std::vector<double> late;
std::vector<double> promptI;
std::vector<double> promptQ;
+ std::vector<double> CN0_dBHz;
epoch_counter = 0;
while (trk_dump.read_binary_obs())
@@ -488,6 +491,7 @@ TEST_F(GpsL1CADllPllTrackingTest, ValidationOfResults)
late.push_back(trk_dump.abs_L);
promptI.push_back(trk_dump.prompt_I);
promptQ.push_back(trk_dump.prompt_Q);
+ CN0_dBHz.push_back(trk_dump.CN0_SNV_dB_Hz);
}
// Align initial measurements and cut the tracking pull-in transitory
@@ -555,6 +559,17 @@ TEST_F(GpsL1CADllPllTrackingTest, ValidationOfResults)
g2.savetops("Constellation");
g2.savetopdf("Constellation", 18);
g2.showonscreen(); // window output
+
+ Gnuplot g3("linespoints");
+ g3.set_title("GPS L1 C/A tracking CN0 output (satellite PRN #" + std::to_string(FLAGS_test_satellite_PRN) + ")");
+ g3.set_grid();
+ g3.set_xlabel("Time [s]");
+ g3.set_ylabel("Reported CN0 [dB-Hz]");
+ g3.cmd("set key box opaque");
+ g3.plot_xy(timevec, CN0_dBHz, "Prompt", decimate);
+ g3.savetops("CN0_output");
+ g3.savetopdf("CN0_output", 18);
+ g3.showonscreen(); // window output
}
catch (const GnuplotException& ge)
{