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Limit BeiDou GEO satellites extend_correlation_symbols to 2

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...to improve tracking performance

Signed-off-by: Vladisslav P <vladisslav2011@gmail.com>
This commit is contained in:
Vladisslav P 2022-07-15 22:58:31 +03:00
parent 2b3b5a1242
commit 27ec96def4
2 changed files with 16 additions and 5 deletions
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20
src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking.cc
View File

@ -109,6 +109,7 @@ dll_pll_veml_tracking::dll_pll_veml_tracking(const Dll_Pll_Conf &conf_)
d_state(0), // initial state: standby
d_current_prn_length_samples(static_cast<int32_t>(d_trk_parameters.vector_length)),
d_extend_correlation_symbols_count(0),
d_extend_correlation_symbols(d_trk_parameters.extend_correlation_symbols),
d_cn0_estimation_counter(0),
d_carrier_lock_fail_counter(0),
d_code_lock_fail_counter(0),
@ -652,6 +653,7 @@ void dll_pll_veml_tracking::start_tracking()
Signal_[0] = d_acquisition_gnss_synchro->Signal[0];
Signal_[1] = d_acquisition_gnss_synchro->Signal[1];
Signal_[2] = d_acquisition_gnss_synchro->Signal[2];
d_extend_correlation_symbols = d_trk_parameters.extend_correlation_symbols;
if (d_systemName == "GPS" and d_signal_type == "1C")
{
@ -769,6 +771,10 @@ void dll_pll_veml_tracking::start_tracking()
d_secondary_code_string = BEIDOU_B1I_GEO_PREAMBLE_SYMBOLS_STR;
d_data_secondary_code_length = 0;
d_Prompt_circular_buffer.set_capacity(d_secondary_code_length);
if (d_extend_correlation_symbols > BEIDOU_B1I_GEO_TELEMETRY_SYMBOLS_PER_BIT)
{
d_extend_correlation_symbols = BEIDOU_B1I_GEO_TELEMETRY_SYMBOLS_PER_BIT;
}
}
else
{
@ -802,6 +808,10 @@ void dll_pll_veml_tracking::start_tracking()
d_secondary_code_string = BEIDOU_B3I_GEO_PREAMBLE_SYMBOLS_STR;
d_data_secondary_code_length = 0;
d_Prompt_circular_buffer.set_capacity(d_secondary_code_length);
if (d_extend_correlation_symbols > BEIDOU_B3I_GEO_TELEMETRY_SYMBOLS_PER_BIT)
{
d_extend_correlation_symbols = BEIDOU_B3I_GEO_TELEMETRY_SYMBOLS_PER_BIT;
}
}
else
{
@ -1876,12 +1886,12 @@ int dll_pll_veml_tracking::general_work(int noutput_items __attribute__((unused)
{
// UPDATE INTEGRATION TIME
d_extend_correlation_symbols_count = 0;
d_current_correlation_time_s = static_cast<float>(d_trk_parameters.extend_correlation_symbols) * static_cast<float>(d_code_period);
d_current_correlation_time_s = static_cast<float>(d_extend_correlation_symbols) * static_cast<float>(d_code_period);
d_state = 3; // next state is the extended correlator integrator
LOG(INFO) << "Enabled " << d_trk_parameters.extend_correlation_symbols * static_cast<int32_t>(d_code_period * 1000.0) << " ms extended correlator in channel "
LOG(INFO) << "Enabled " << d_extend_correlation_symbols * static_cast<int32_t>(d_code_period * 1000.0) << " ms extended correlator in channel "
<< d_channel
<< " for satellite " << Gnss_Satellite(d_systemName, d_acquisition_gnss_synchro->PRN);
std::cout << "Enabled " << d_trk_parameters.extend_correlation_symbols * static_cast<int32_t>(d_code_period * 1000.0) << " ms extended correlator in channel "
std::cout << "Enabled " << d_extend_correlation_symbols * static_cast<int32_t>(d_code_period * 1000.0) << " ms extended correlator in channel "
<< d_channel
<< " for satellite " << Gnss_Satellite(d_systemName, d_acquisition_gnss_synchro->PRN) << '\n';
// Set narrow taps delay values [chips]
@ -1947,7 +1957,7 @@ int dll_pll_veml_tracking::general_work(int noutput_items __attribute__((unused)
d_P_data_accu = gr_complex(0.0, 0.0);
}
d_extend_correlation_symbols_count++;
if (d_extend_correlation_symbols_count == (d_trk_parameters.extend_correlation_symbols - 1))
if (d_extend_correlation_symbols_count == (d_extend_correlation_symbols - 1))
{
d_extend_correlation_symbols_count = 0;
d_state = 4;
@ -1961,7 +1971,7 @@ int dll_pll_veml_tracking::general_work(int noutput_items __attribute__((unused)
save_correlation_results();
// check lock status
if (!cn0_and_tracking_lock_status(d_code_period * static_cast<double>(d_trk_parameters.extend_correlation_symbols)))
if (!cn0_and_tracking_lock_status(d_code_period * static_cast<double>(d_extend_correlation_symbols)))
{
clear_tracking_vars();
d_state = 0; // loss-of-lock detected

1
src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking.h
View File

@ -180,6 +180,7 @@ private:
int32_t d_n_correlator_taps;
int32_t d_current_prn_length_samples;
int32_t d_extend_correlation_symbols_count;
int32_t d_extend_correlation_symbols;
int32_t d_current_symbol;
int32_t d_current_data_symbol;
int32_t d_cn0_estimation_counter;