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bugfix: Solves shared freq channel ambiguity and carr freq in plots

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Adds code to solve the shared frequency channels for GLONASS satellites
during acq and trk, it is now decode responsability to fix the identifier
when decoding of ephemeris happens. It also adds more details in tracking
plotting and fixes silly bug that created false alarm.
This commit is contained in:
Damian Miralles
2017-09-09 13:44:35 -06:00
parent 778fa4f5f8
commit 2946d36f84
13 changed files with 69 additions and 26 deletions
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4
src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition_cc.cc
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@@ -194,8 +194,8 @@ bool pcps_acquisition_cc::is_fdma()
// Dealing with FDMA system
if( strcmp(d_gnss_synchro->Signal,"1G") == 0 )
{
d_freq += d_old_freq * GLONASS_PRN.at(d_gnss_synchro->PRN);
LOG(INFO) << "Trying to acquire SV PRN " << d_gnss_synchro->PRN << " with freq " << d_old_freq * GLONASS_PRN.at(d_gnss_synchro->PRN) << " in Glonass Channel " << GLONASS_PRN.at(d_gnss_synchro->PRN) << std::endl;
d_freq += DFRQ1_GLO * GLONASS_PRN.at(d_gnss_synchro->PRN);
LOG(INFO) << "Trying to acquire SV PRN " << d_gnss_synchro->PRN << " with freq " << d_freq << " in Glonass Channel " << GLONASS_PRN.at(d_gnss_synchro->PRN) << std::endl;
return true;
}
else

2
src/algorithms/telemetry_decoder/gnuradio_blocks/glonass_l1_ca_telemetry_decoder_cc.cc
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@@ -288,7 +288,7 @@ int glonass_l1_ca_telemetry_decoder_cc::general_work (int noutput_items __attrib
// NEW GLONASS string received
// 0. fetch the symbols into an array
int string_length = GLONASS_GNAV_STRING_SYMBOLS - d_symbols_per_preamble;
double string_symbols[string_length] = {0};
double string_symbols[GLONASS_GNAV_DATA_SYMBOLS] = {0};
//******* SYMBOL TO BIT *******
for (int i = 0; i < string_length; i++)

5
src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_c_aid_tracking_cc.cc
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@@ -196,7 +196,7 @@ void glonass_l1_ca_dll_pll_c_aid_tracking_cc::start_tracking()
acq_trk_diff_seconds = static_cast<double>(acq_trk_diff_samples) / static_cast<double>(d_fs_in);
// Doppler effect
// Fd=(C/(C+Vr))*F
d_glonass_freq_ch = GLONASS_L1_CA_FREQ_HZ + (DFRQ1_GLO * GLONASS_PRN.at(d_acquisition_gnss_synchro->PRN));
d_glonass_freq_ch = GLONASS_L1_CA_FREQ_HZ + (DFRQ1_GLO * static_cast<double>(GLONASS_PRN.at(d_acquisition_gnss_synchro->PRN)));
double radial_velocity = (d_glonass_freq_ch + d_acq_carrier_doppler_hz) / d_glonass_freq_ch;
// new chip and prn sequence periods based on acq Doppler
double T_chip_mod_seconds;
@@ -576,7 +576,8 @@ int glonass_l1_ca_dll_pll_c_aid_tracking_cc::general_work (int noutput_items __a
d_dump_file.write(reinterpret_cast<char*>(&d_acc_carrier_phase_cycles), sizeof(double));
// carrier and code frequency
d_dump_file.write(reinterpret_cast<char*>(&d_carrier_doppler_hz), sizeof(double));
double if_freq_carrier = d_carrier_doppler_hz + d_if_freq + (DFRQ1_GLO * static_cast<double>(GLONASS_PRN.at(d_acquisition_gnss_synchro->PRN)));
d_dump_file.write(reinterpret_cast<char*>(&if_freq_carrier), sizeof(double));
d_dump_file.write(reinterpret_cast<char*>(&d_code_freq_chips), sizeof(double));
//PLL commands

2
src/algorithms/tracking/gnuradio_blocks/glonass_l1_ca_dll_pll_c_aid_tracking_cc.h
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@@ -85,7 +85,7 @@ private:
long d_if_freq;
long d_fs_in;
long d_glonass_freq_ch;
double d_glonass_freq_ch;
double d_early_late_spc_chips;
int d_n_correlator_taps;