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

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Carles Fernandez 2018-04-23 16:07:22 +02:00
commit 01d1a78108
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GPG Key ID: 4C583C52B0C3877D
17 changed files with 48 additions and 33 deletions
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8
src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking.cc
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@ -615,7 +615,7 @@ bool dll_pll_veml_tracking::acquire_secondary()
}
bool dll_pll_veml_tracking::cn0_and_tracking_lock_status()
bool dll_pll_veml_tracking::cn0_and_tracking_lock_status(double coh_integration_time_s)
{
// ####### CN0 ESTIMATION AND LOCK DETECTORS ######
if (d_cn0_estimation_counter < FLAGS_cn0_samples)
@ -629,7 +629,7 @@ bool dll_pll_veml_tracking::cn0_and_tracking_lock_status()
{
d_cn0_estimation_counter = 0;
// Code lock indicator
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, FLAGS_cn0_samples, static_cast<long>(trk_parameters.fs_in), static_cast<double>(d_code_length_chips));
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, FLAGS_cn0_samples, coh_integration_time_s);
// Carrier lock indicator
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, FLAGS_cn0_samples);
// Loss of lock detection
@ -1242,7 +1242,7 @@ int dll_pll_veml_tracking::general_work(int noutput_items __attribute__((unused)
d_L_accu = *d_Late;
// Check lock status
if (!cn0_and_tracking_lock_status())
if (!cn0_and_tracking_lock_status(static_cast<double>(d_correlation_length_ms) / 1000.0))
{
clear_tracking_vars();
d_state = 0; // loss-of-lock detected
@ -1420,7 +1420,7 @@ int dll_pll_veml_tracking::general_work(int noutput_items __attribute__((unused)
save_correlation_results();
// check lock status
if (!cn0_and_tracking_lock_status())
if (!cn0_and_tracking_lock_status((static_cast<double>(d_correlation_length_ms) / 1000.0) * static_cast<double>(trk_parameters.extend_correlation_symbols)))
{
clear_tracking_vars();
d_state = 0; // loss-of-lock detected

2
src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking.h
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@ -89,7 +89,7 @@ private:
dll_pll_veml_tracking(dllpllconf_t conf_);
bool cn0_and_tracking_lock_status();
bool cn0_and_tracking_lock_status(double coh_integration_time_s);
bool acquire_secondary();
void do_correlation_step(const gr_complex *input_samples);
void run_dll_pll();

2
src/algorithms/tracking/gnuradio_blocks/galileo_e1_tcp_connector_tracking_cc.cc
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@ -418,7 +418,7 @@ int Galileo_E1_Tcp_Connector_Tracking_cc::general_work(int noutput_items __attri
d_cn0_estimation_counter = 0;
// Code lock indicator
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, FLAGS_cn0_samples, d_fs_in, Galileo_E1_B_CODE_LENGTH_CHIPS);
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, FLAGS_cn0_samples, Galileo_E1_CODE_PERIOD);
// Carrier lock indicator
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, FLAGS_cn0_samples);

2
src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_c_aid_tracking_cc.cc
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@ -794,7 +794,7 @@ int glonass_l1_ca_dll_pll_c_aid_tracking_cc::general_work(int noutput_items __at
{
d_cn0_estimation_counter = 0;
// Code lock indicator
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES, d_fs_in, GLONASS_L1_CA_CODE_LENGTH_CHIPS);
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES, GLONASS_L1_CA_CODE_PERIOD);
// Carrier lock indicator
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES);
// Loss of lock detection

2
src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_c_aid_tracking_sc.cc
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@ -785,7 +785,7 @@ int glonass_l1_ca_dll_pll_c_aid_tracking_sc::general_work(int noutput_items __at
{
d_cn0_estimation_counter = 0;
// Code lock indicator
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES, d_fs_in, GLONASS_L1_CA_CODE_LENGTH_CHIPS);
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES, GLONASS_L1_CA_CODE_PERIOD);
// Carrier lock indicator
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES);
// Loss of lock detection

2
src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_tracking_cc.cc
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@ -652,7 +652,7 @@ int Glonass_L1_Ca_Dll_Pll_Tracking_cc::general_work(int noutput_items __attribut
{
d_cn0_estimation_counter = 0;
// Code lock indicator
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES, d_fs_in, GLONASS_L1_CA_CODE_LENGTH_CHIPS);
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES, GLONASS_L1_CA_CODE_PERIOD);
// Carrier lock indicator
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES);
// Loss of lock detection

2
src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_c_aid_tracking_cc.cc
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@ -791,7 +791,7 @@ int glonass_l2_ca_dll_pll_c_aid_tracking_cc::general_work(int noutput_items __at
{
d_cn0_estimation_counter = 0;
// Code lock indicator
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES, d_fs_in, GLONASS_L2_CA_CODE_LENGTH_CHIPS);
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES, GLONASS_L2_CA_CODE_PERIOD);
// Carrier lock indicator
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES);
// Loss of lock detection

2
src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_c_aid_tracking_sc.cc
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@ -783,7 +783,7 @@ int glonass_l2_ca_dll_pll_c_aid_tracking_sc::general_work(int noutput_items __at
{
d_cn0_estimation_counter = 0;
// Code lock indicator
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES, d_fs_in, GLONASS_L2_CA_CODE_LENGTH_CHIPS);
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES, GLONASS_L2_CA_CODE_PERIOD);
// Carrier lock indicator
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES);
// Loss of lock detection

2
src/algorithms/tracking/gnuradio_blocks/glonass_l2_ca_dll_pll_tracking_cc.cc
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@ -652,7 +652,7 @@ int Glonass_L2_Ca_Dll_Pll_Tracking_cc::general_work(int noutput_items __attribut
{
d_cn0_estimation_counter = 0;
// Code lock indicator
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES, d_fs_in, GLONASS_L2_CA_CODE_LENGTH_CHIPS);
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES, GLONASS_L2_CA_CODE_PERIOD);
// Carrier lock indicator
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, CN0_ESTIMATION_SAMPLES);
// Loss of lock detection

2
src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_c_aid_tracking_cc.cc
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@ -773,7 +773,7 @@ int gps_l1_ca_dll_pll_c_aid_tracking_cc::general_work(int noutput_items __attrib
{
d_cn0_estimation_counter = 0;
// Code lock indicator
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, FLAGS_cn0_samples, d_fs_in, GPS_L1_CA_CODE_LENGTH_CHIPS);
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, FLAGS_cn0_samples, GPS_L1_CA_CODE_PERIOD);
// Carrier lock indicator
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, FLAGS_cn0_samples);
// Loss of lock detection

2
src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_c_aid_tracking_fpga_sc.cc
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@ -805,7 +805,7 @@ int gps_l1_ca_dll_pll_c_aid_tracking_fpga_sc::general_work(
{
d_cn0_estimation_counter = 0;
// Code lock indicator
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, FLAGS_cn0_samples, d_fs_in, GPS_L1_CA_CODE_LENGTH_CHIPS);
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, FLAGS_cn0_samples, GPS_L1_CA_CODE_PERIOD);
// Carrier lock indicator
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, FLAGS_cn0_samples);
// Loss of lock detection

2
src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_c_aid_tracking_sc.cc
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@ -775,7 +775,7 @@ int gps_l1_ca_dll_pll_c_aid_tracking_sc::general_work(int noutput_items __attrib
{
d_cn0_estimation_counter = 0;
// Code lock indicator
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, FLAGS_cn0_samples, d_fs_in, GPS_L1_CA_CODE_LENGTH_CHIPS);
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, FLAGS_cn0_samples, GPS_L1_CA_CODE_PERIOD);
// Carrier lock indicator
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, FLAGS_cn0_samples);
// Loss of lock detection

2
src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_dll_pll_tracking_gpu_cc.cc
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@ -445,7 +445,7 @@ int Gps_L1_Ca_Dll_Pll_Tracking_GPU_cc::general_work(int noutput_items __attribut
{
d_cn0_estimation_counter = 0;
// Code lock indicator
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, FLAGS_cn0_samples, d_fs_in, GPS_L1_CA_CODE_LENGTH_CHIPS);
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, FLAGS_cn0_samples, GPS_L1_CA_CODE_PERIOD);
// Carrier lock indicator
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, FLAGS_cn0_samples);
// Loss of lock detection

2
src/algorithms/tracking/gnuradio_blocks/gps_l1_ca_tcp_connector_tracking_cc.cc
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@ -455,7 +455,7 @@ int Gps_L1_Ca_Tcp_Connector_Tracking_cc::general_work(int noutput_items __attrib
else
{
d_cn0_estimation_counter = 0;
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, FLAGS_cn0_samples, d_fs_in, GPS_L1_CA_CODE_LENGTH_CHIPS);
d_CN0_SNV_dB_Hz = cn0_svn_estimator(d_Prompt_buffer, FLAGS_cn0_samples, GPS_L1_CA_CODE_PERIOD);
d_carrier_lock_test = carrier_lock_detector(d_Prompt_buffer, FLAGS_cn0_samples);
// ###### TRACKING UNLOCK NOTIFICATION #####

10
src/algorithms/tracking/libs/lock_detectors.cc
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@ -58,14 +58,14 @@
* \f$\hat{P}_{tot}=\frac{1}{N}\sum^{N-1}_{i=0}|Pc(i)|^2\f$ is the estimator of the total power, \f$|\cdot|\f$ is the absolute value,
* \f$Re(\cdot)\f$ stands for the real part of the value, and \f$Pc(i)\f$ is the prompt correlator output for the sample index i.
*
* The SNR value is converted to CN0 [dB-Hz], taking to account the receiver bandwidth and the PRN code gain, using the following formula:
* The SNR value is converted to CN0 [dB-Hz], taking to account the coherent integration time, using the following formula:
* \f{equation}
* CN0_{dB}=10*log(\hat{\rho})+10*log(\frac{f_s}{2})-10*log(L_{PRN}),
* CN0_{dB}=10*log(\hat{\rho})-10*log(T_{int}),
* \f}
* where \f$f_s\f$ is the sampling frequency and \f$L_{PRN}\f$ is the PRN sequence length.
* where \f$T_{int}\f$ is the coherent integration time, in seconds.
*
*/
float cn0_svn_estimator(gr_complex* Prompt_buffer, int length, long fs_in, double code_length)
float cn0_svn_estimator(const gr_complex* Prompt_buffer, int length, double coh_integration_time_s)
{
double SNR = 0.0;
double SNR_dB_Hz = 0.0;
@ -80,7 +80,7 @@ float cn0_svn_estimator(gr_complex* Prompt_buffer, int length, long fs_in, doubl
Psig = Psig * Psig;
Ptot /= static_cast<double>(length);
SNR = Psig / (Ptot - Psig);
SNR_dB_Hz = 10.0 * log10(SNR) + 10.0 * log10(static_cast<double>(fs_in) / 2.0) - 10.0 * log10(code_length);
SNR_dB_Hz = 10.0 * log10(SNR) - 10.0 * log10(coh_integration_time_s);
return static_cast<float>(SNR_dB_Hz);
}

8
src/algorithms/tracking/libs/lock_detectors.h
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@ -62,17 +62,17 @@
* \f$\hat{P}_{tot}=\frac{1}{N}\sum^{N-1}_{i=0}|Pc(i)|^2\f$ is the estimator of the total power, \f$|\cdot|\f$ is the absolute value,
* \f$Re(\cdot)\f$ stands for the real part of the value, and \f$Pc(i)\f$ is the prompt correlator output for the sample index i.
*
* The SNR value is converted to CN0 [dB-Hz], taking to account the receiver bandwidth and the PRN code gain, using the following formula:
* The SNR value is converted to CN0 [dB-Hz], taking to account the coherent integration time, using the following formula:
* \f{equation}
* CN0_{dB}=10*log(\hat{\rho})+10*log(\frac{f_s}{2})-10*log(L_{PRN}),
* CN0_{dB}=10*log(\hat{\rho})-10*log(2 * T_{int}),
* \f}
* where \f$f_s\f$ is the sampling frequency and \f$L_{PRN}\f$ is the PRN sequence length.
* where \f$T_{int}\f$ is the coherent integration time, in seconds.
* Ref: Marco Pini, Emanuela Falletti and Maurizio Fantino, "Performance
* Evaluation of C/N0 Estimators using a Real Time GNSS Software Receiver,"
* IEEE 10th International Symposium on Spread Spectrum Techniques and
* Applications, pp.28-30, August 2008.
*/
float cn0_svn_estimator(gr_complex* Prompt_buffer, int length, long fs_in, double code_length);
float cn0_svn_estimator(const gr_complex* Prompt_buffer, int length, double coh_integration_time_s);
/*! \brief A carrier lock detector

29
src/tests/unit-tests/signal-processing-blocks/tracking/gps_l1_ca_dll_pll_tracking_test.cc
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@ -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)
{