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[fix](trx-rs): improve FT2 coherent decoding

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Add coherent FT2 sync and likelihood extraction.
Align FT2 frequency and DT reporting with the reference decoder.
Fix vendored monitor phase-mode type mismatches.

Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>
This commit is contained in:
Stan Grams
2026-03-14 20:25:59 +01:00
parent 2570fe739e
commit 27de75cf79
5 changed files with 192 additions and 9 deletions
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src/decoders/trx-ft8/src/ft8_wrapper.c
+30 -3
View File
@@ -115,6 +115,33 @@ typedef struct
float freq_hz;
} ft8_decode_result_t;
static float ft2_frequency_offset_hz(void)
{
return -1.5f / FT2_SYMBOL_PERIOD;
}
static float decoder_candidate_freq_hz(const ft8_decoder_t* dec, const ftx_candidate_t* cand)
{
const ftx_waterfall_t* wf = &dec->mon.wf;
float freq_hz = (dec->mon.min_bin + cand->freq_offset + (float)cand->freq_sub / wf->freq_osr) / dec->mon.symbol_period;
if (dec->cfg.protocol == FTX_PROTOCOL_FT2)
{
freq_hz += ft2_frequency_offset_hz();
}
return freq_hz;
}
static float decoder_candidate_dt_s(const ft8_decoder_t* dec, const ftx_candidate_t* cand)
{
const ftx_waterfall_t* wf = &dec->mon.wf;
float time_sec = (cand->time_offset + (float)cand->time_sub / wf->time_osr) * dec->mon.symbol_period;
if (dec->cfg.protocol == FTX_PROTOCOL_FT2)
{
time_sec -= 0.5f;
}
return time_sec;
}
ft8_decoder_t* ft8_decoder_create(int sample_rate, float f_min, float f_max, int time_osr, int freq_osr, int protocol)
{
ft8_decoder_t* dec = (ft8_decoder_t*)calloc(1, sizeof(ft8_decoder_t));
@@ -195,7 +222,7 @@ int ft8_decoder_decode(ft8_decoder_t* dec, ft8_decode_result_t* out, int max_res
const ftx_waterfall_t* wf = &dec->mon.wf;
const bool is_ft2 = (dec->cfg.protocol == FTX_PROTOCOL_FT2);
const int kMaxCandidates = is_ft2 ? 400 : 200;
const int kMinScore = is_ft2 ? 4 : 10;
const int kMinScore = is_ft2 ? 0 : 10;
const int kLdpcIters = is_ft2 ? 50 : 30;
ftx_candidate_t candidate_list[kMaxCandidates];
@@ -213,8 +240,8 @@ int ft8_decoder_decode(ft8_decoder_t* dec, ft8_decode_result_t* out, int max_res
{
const ftx_candidate_t* cand = &candidate_list[idx];
float freq_hz = (dec->mon.min_bin + cand->freq_offset + (float)cand->freq_sub / wf->freq_osr) / dec->mon.symbol_period;
float time_sec = (cand->time_offset + (float)cand->time_sub / wf->time_osr) * dec->mon.symbol_period;
float freq_hz = decoder_candidate_freq_hz(dec, cand);
float time_sec = decoder_candidate_dt_s(dec, cand);
ftx_message_t message;
ftx_decode_status_t status;