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Fix computation of Galileo E6 pseudoranges using TOW from source timetag

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This commit is contained in:
Javier Arribas 2022-05-23 17:32:09 +02:00
parent 67e4d7c6e2
commit a45998d0db
1 changed files with 9 additions and 7 deletions
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16
src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_telemetry_decoder_gs.cc
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@ -1022,19 +1022,19 @@ int galileo_telemetry_decoder_gs::general_work(int noutput_items __attribute__((
case 3: // CNAV case 3: // CNAV
{ {
// TODO // TODO
// Obtain Galileo E6 TOW from timetags, if available // Add option to use system time to estimate the preamble TOW
// Add option to use Galileo E1 or E5 TOW information..
// Done: Obtain Galileo E6 TOW from timetags, if available
if (d_valid_timetag == true) if (d_valid_timetag == true)
{ {
int rx_tow_at_preamble = d_current_timetag.tow_ms; int rx_tow_at_preamble = d_current_timetag.tow_ms;
uint32_t predicted_tow_at_preamble_ms = 1000 * (rx_tow_at_preamble / 1000); // floor to integer number of seconds uint32_t predicted_tow_at_preamble_ms = 1000 * (rx_tow_at_preamble / 1000); // floor to integer number of seconds
d_TOW_at_Preamble_ms = predicted_tow_at_preamble_ms; d_TOW_at_Preamble_ms = predicted_tow_at_preamble_ms;
//todo: compute tow at current symbol from the decoder delay similar as d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>((d_required_symbols + 1) * GALILEO_FNAV_CODES_PER_SYMBOL * GALILEO_E5A_CODE_PERIOD_MS); d_TOW_at_current_symbol_ms = predicted_tow_at_preamble_ms + static_cast<uint32_t>((d_required_symbols + 1) * d_PRN_code_period_ms);
d_TOW_at_current_symbol_ms = predicted_tow_at_preamble_ms + static_cast<uint32_t>((GALILEO_CNAV_SYMBOLS_PER_PAGE - GALILEO_CNAV_PREAMBLE_LENGTH_BITS) * d_PRN_code_period_ms);
if (d_E6_TOW_set == false) if (d_E6_TOW_set == false)
{ {
std::cout << " Sat PRN " << d_satellite.get_PRN() << " E6 TimeTag TOW at preamble: " << predicted_tow_at_preamble_ms std::cout << " Sat PRN " << d_satellite.get_PRN() << " E6 TimeTag TOW at preamble: " << predicted_tow_at_preamble_ms
// << " [ms] TOW fraction: " << d_current_timetag.tow_ms_fraction
<< " [ms] d_TOW_at_current_symbol_ms: " << d_TOW_at_current_symbol_ms << " [ms]\n"; << " [ms] d_TOW_at_current_symbol_ms: " << d_TOW_at_current_symbol_ms << " [ms]\n";
d_E6_TOW_set = true; d_E6_TOW_set = true;
} }
@ -1064,8 +1064,10 @@ int galileo_telemetry_decoder_gs::general_work(int noutput_items __attribute__((
} }
case 3: // CNAV case 3: // CNAV
{ {
// TODO if (d_E6_TOW_set == true)
d_TOW_at_current_symbol_ms += d_PRN_code_period_ms; // this is not the TOW! {
d_TOW_at_current_symbol_ms += d_PRN_code_period_ms;
}
break; break;
} }
} }