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Fix a bug that prevented from obtaining PVT fixes with Galileo E1 signals if frame 0 was the first to be decoded

This commit is contained in:
Carles Fernandez 2021-11-29 17:01:58 +01:00
parent c4aca73e67
commit 5f2f752421
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2 changed files with 9 additions and 9 deletions
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2
docs/CHANGELOG.md
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@ -19,6 +19,8 @@ All notable changes to GNSS-SDR will be documented in this file.
- Improved Time-To-First-Fix when using GPS L1 C/A signals, fixing a bug that
was making the receiver to drop the satellite if the PLL got locked at 180
degrees, and making some optimizations on bit transition detection.
- Fixed a bug that prevented from obtaining PVT fixes with Galileo E1 OS signals
if the I/NAV subframe type 0 was the first decoded subframe.
### Improvements in Interoperability:

16
src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_telemetry_decoder_gs.cc
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@ -882,15 +882,13 @@ int galileo_telemetry_decoder_gs::general_work(int noutput_items __attribute__((
d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>(GALILEO_INAV_PAGE_PART_MS + (d_required_symbols + 1) * d_PRN_code_period_ms);
d_inav_nav.set_TOW6_flag(false);
}
// warning: type 0 frame does not contain a valid TOW in some simulated signals, thus it is not safe to activate the following code:
// else if (d_inav_nav.is_TOW0_set() == true) // page 0 arrived and decoded
// {
// // TOW_0 refers to the even preamble, but when we decode it we are in the odd part, so 1 second later plus the decoding delay
// d_TOW_at_Preamble_ms = static_cast<uint32_t>(d_inav_nav.get_TOW0() * 1000.0);
// d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>(GALILEO_INAV_PAGE_PART_MS + (d_required_symbols + 1) * d_PRN_code_period_ms);
// d_inav_nav.set_TOW0_flag(false);
// // std::cout << "FRAME 0 current tow: " << tmp_d_TOW_at_current_symbol_ms << " vs. " << d_TOW_at_current_symbol_ms + d_PRN_code_period_ms << "\n";
// }
else if (d_inav_nav.is_TOW0_set() == true) // page 0 arrived and decoded
{
// TOW_0 refers to the even preamble, but when we decode it we are in the odd part, so 1 second later plus the decoding delay
d_TOW_at_Preamble_ms = static_cast<uint32_t>(d_inav_nav.get_TOW0() * 1000.0);
d_TOW_at_current_symbol_ms = d_TOW_at_Preamble_ms + static_cast<uint32_t>(GALILEO_INAV_PAGE_PART_MS + (d_required_symbols + 1) * d_PRN_code_period_ms);
d_inav_nav.set_TOW0_flag(false);
}
else
{
// this page has no timing information