Acquisition_<signal>.dual_freq_assisted_doppler_narrowing (default
true, preserving current behavior) lets a specific signal's
acquisition be forced back to a full, unaided Doppler search even
while GNSS-SDR.assist_dual_frequency_acq is enabled for the other
signals. Knowingly reintroduces part of what f7948f4af retired under
#1097, under a clearer name -- see PR description for the regression
and spoofing-resilience evidence motivating it.
A complete, ready-to-edit example config for EVK1029_Signal_Source with
RF_channels=2, demonstrating the file_offset seeking option added in
this PR alongside the rest of the signal chain, acquisition/tracking
Doppler-narrowing assist, runtime visibility-aware acquisition search,
AGNSS aiding, and the remote monitor/telecommand interfaces -- all keys
verified against this branch's source to confirm they're implemented.
Introduce the 5D signal chain: ICD BPSK(10) replica, PCPS acquisition,
DLL-PLL tracking (1 ms data component), and a first-cut B-CNAV2 decoder
(preamble + CRC-24Q, MT10/MT11/MT30, systematic 288 bits, no 64-ary
LDPC). GEO and BDS-2 PRNs are not assigned B2a channels. B2a-only SPP
remaps 5D onto RTKLIB slot 0 with lam[0]=c/FREQ5.
Signed-off-by: huangchuhan <huangchh37@mail2.sysu.edu.cn>
- Rename doppler_uncertanty -> doppler_uncertainty throughout (interface,
adapter, block, comments, log message).
- Fix the out-of-bounds write and mis-detection in narrowed-mode
activation: track it with an explicit d_doppler_search_narrowed flag,
set directly in set_doppler_uncertainty() and guarded on
d_num_doppler_bins > 1, instead of inferring it from
"d_num_doppler_bins_active < d_num_doppler_bins". That inferred check
broke two ways: for a 1-bin full grid (a valid, already-accepted
config), it still forced 2 active bins, writing past the grid/wipeoff
allocations sized to d_num_doppler_bins; for a 2-bin full grid, an
actually-narrowed request computes the same active count as the full
grid (2 < 2 is false), so it silently searched the full grid's own
bin layout instead of the assisted {center, center + doppler_max}
pair. Reproduced the out-of-bounds write directly (temporarily
reverting to the inferred check crashes with "corrupted double-linked
list" under the new NarrowingEnabledOneBinGrid test) and the
mis-detection (NarrowingEnabledTwoBinGrid).
- Keep the noise-reference bin out of candidate selection: both
max_to_input_power_statistic() and first_vs_second_peak_statistic()
now take a separate candidate_count, used only for the peak-search
loop bound; the CFAR path's own num_doppler_bins (used for the
"opposite bin" reference lookup) is unchanged. In narrowed mode,
candidate_count is 1 -- the noise-reference bin can no longer win and
be reported as the acquisition result, regardless of its own power
(verified against a live signal deliberately placed in the reference
bin instead of the known/candidate bin: reverting this fix, both the
CFAR and peak-ratio statistic mistakenly report the reference bin's
Doppler as if it were the assisted center).
- Recalibrate the acceptance threshold for narrowed acquisition: adds
d_threshold_narrowed, computed like d_threshold but with
num_doppler_bins = 1 (the true candidate count in narrowed mode)
instead of the full grid's bin count, since compute_threshold() folds
the candidate count into the false-alarm probability and reusing the
full-grid threshold in narrowed mode was effectively far stricter
than the requested PFA. get_threshold() returns it whenever
d_doppler_search_narrowed is true.
- Fix narrowed dump layout/metadata: ensure_dump_grid_allocated() now
sizes acq_grid to d_num_doppler_bins_active (not the full grid width),
matching what copy_magnitude_grid_to_dump_grid() actually writes each
cycle -- this also makes narrow<->full transitions between dumps
self-correcting. dump_results() writes accurate, mode-appropriate
doppler_max/doppler_step (the same {0, doppler_max} encoding
compute_statistics() uses internally when narrowed), plus new
doppler_center and doppler_narrowed fields so offline post-processing
can tell which encoding is in effect. Verified end to end against a
live dump (NarrowedDumpMetadata).
- Strengthen Acq_Conf::enable_doppler_narrowing's doc comment (default,
which implementations it applies to, its dependency on the caller
passing doppler_uncertainty == 0) and add a commented usage example
next to GNSS-SDR.assist_dual_frequency_acq in a dual-frequency
Galileo E1B+E5a example config.
- Add tests/.../pcps_acquisition_doppler_narrowing_test.cc: 8 focused
tests (narrowing enabled/disabled, 1-bin and 2-bin full-grid
configurations, CFAR and peak-ratio statistics, a full-narrow-full
transition, two-step acquisition with step-1 narrowing, and narrowed
dump metadata), built on the same real-capture/known-ground-truth
pattern as gps_l1_ca_pcps_acquisition_test.cc. Confirmed each targeted
regression test actually fails without its corresponding fix before
finalizing them.
Signed-off-by: joebre <joel.brenner@saphyrion.ch>
Compensate the Viterbi traceback delay when timestamping decoded SBAS
messages by carrying per-sample reception timestamps through the sample
and symbol aligners (removes a ~140 ms bias), with a deterministic unit
test covering the FIFO pairing.
Protect decoder state with d_setlock in reset(), set_satellite(),
set_channel() and general_work(), following the convention of the other
telemetry decoders.
Share per-PRN EMS dump files through a per-run dump session: the first
open in a run truncates stale data, later opens append, so channel
reassignments no longer wipe previously decoded messages.
- gnss_satellite.cc: accept the full supported SBAS PRN range (120-138)
instead of a stale 6-PRN whitelist that rejected valid PRNs such as WAAS
PRN 133. Per-PRN satellite/service names are no longer hardcoded, since
that assignment changes over time and cannot be reliably kept up to date
here (fixes review comments on PRN support and outdated satellite info).
- SBAS_L1.h: cap SBAS_L1_MAX_COHERENT_INTEGRATION_SYMBOLS at 1 (1 ms). The
telemetry decoder performs its own unsynchronized sample/symbol pairing,
so extending tracking's coherent integration to 2 ms is unsafe and
corrupts that pairing.
- sbas_l1_telemetry_decoder_gs.{h,cc}: carry an absolute per-sample/per-bit
timestamp through the sample buffer and Frame_Detector, replacing the
buggy offset that anchored the message timestamp to whichever sample was
current when decoding happened, which could be off by up to a full
message duration. Add
sbas_l1_telemetry_decoder_gs::compute_message_timestamp() as a small,
independently testable helper for the residual sub-bit correction, and a
matching deterministic unit test.
- sbas_l1_telemetry_decoder_gs.{h,cc}: implement a real reset() that clears
all decoder buffers/aligners and closes the dump file, so a channel
reassigned to a different PRN never mixes messages into the previous
satellite's file.
- Remove the orphan sbas_l1_telemetry_decoder.cc adapter: it includes a
header that no longer exists and is not part of any CMake target (the
factory instantiates the GNU Radio block directly), so it silently never
compiled.
- Dump file: overwrite instead of append on each run, remove the hardcoded
GNSS-SDR version string, and document that the .ems output is an
EMS-like raw message dump, not a conformant EMS file.
- conf/File_input/SBAS/gnss-sdr_SBAS_EGNOS_rx.conf: drop the outdated
PRN/satellite table and per-channel satellite comments, correct the
coherent-integration note to 1 ms, and clarify that SBAS is not used as
a ranging source in this configuration.
Signed-off-by: miguekf <miguel.gomezlopez@uclm.es>
Put B1C on RTKLIB slot 0 with prefer-B1C XOR and lam[0] override,
align QMBOC quadrature and BCH thresholds with the ICD, fix BDGIM
nearest-odd-hour t_p and CNAV1 ephemeris defaults, tighten math/constants
usage, and drop the non-reproducible LDPC generator script. Move replica,
LDPC, and navigation unit tests into the default test set.
Signed-off-by: OuWenhao16 <104730917+OuWenhao16@users.noreply.github.com>
Update pseudorange outlier rejection
- Gate relative pseudorange rejection behind a new configuration flag
`Observables.reject_outlier_pseudoranges` (default: true) to prevent
premature PVT breakage and improve space compatibility.
Align B1C with unified adapters.
- Fold B1C acquisition/tracking/telemetry into PcpsAcquisitionAdapter,
DllPllTrackingAdapter, and TelemetryDecoderAdapter, and add SPDX author
headers for the B1C/CNAV1 contribution files.
Fix B1C ICD alignment for eph, TGD, UTC, and PR gating.
Gate CNAV1 publish on IODE/IODC, fix gettgd SYS_BDS selection,
correct LS/LSF and UTC scales, and drop the MEO-biased PR median cut.
Signed-off-by: OuWenhao16 <104730917+OuWenhao16@users.noreply.github.com>
Map B1C to its own RTKLIB frequency/wavelength, apply correct TGD/ISC and BDGIM,
and define same-PRN mixed-signal policy with regression tests and conf notes.
Signed-off-by: OuWenhao16 <104730917+OuWenhao16@users.noreply.github.com>
Integrate acquisition, pilot/data tracking, B-CNAV1 telemetry decoding, and
PVT/RINEX hooks on upstream/next with minimal changes to shared blocks.
Includes example configuration, code generators, and unit tests.
Signed-off-by: OuWenhao16 <104730917+OuWenhao16@users.noreply.github.com>
Signed-off-by: Vladslav P <vladisslav2011@gmail.com>
Carles Fernandez