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[fix](trx-vdes): lower burst detector thresholds

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Reduce the VDES burst detector trigger and sustain thresholds so weaker received bursts enter and finalize more readily instead of being ignored by the IQ-side detector.

Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>
This commit is contained in:
Stan Grams
2026-03-03 01:04:14 +01:00
parent 9fe293e056
commit c6af684d6c
1 changed files with 6 additions and 2 deletions
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src/decoders/trx-vdes/src/lib.rs
+6 -2
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@@ -35,6 +35,10 @@ const TER_MCS1_100_SYNC_BITS: &[u8; TER_MCS1_100_SYNC_SYMBOLS] = b"1111110011010
const PI4_QPSK_DIBITS: [u8; 4] = [0b00, 0b01, 0b11, 0b10];
const MIN_SYNC_CANDIDATE_SCORE: f32 = 0.20;
const MIN_SYNC_PARSE_SCORE: f32 = 0.50;
const BURST_TRIGGER_NOISE_MULT: f32 = 4.0;
const BURST_TRIGGER_FLOOR: f32 = 8.0e-5;
const BURST_SUSTAIN_NOISE_MULT: f32 = 1.5;
const BURST_SUSTAIN_FLOOR: f32 = 5.0e-5;
#[derive(Debug, Clone)]
pub struct VdesDecoder {
@@ -74,7 +78,7 @@ impl VdesDecoder {
let power = sample.norm_sqr();
if !self.in_burst {
self.noise_floor = 0.995 * self.noise_floor + 0.005 * power;
let trigger = (self.noise_floor * 8.0).max(2.0e-4);
let trigger = (self.noise_floor * BURST_TRIGGER_NOISE_MULT).max(BURST_TRIGGER_FLOOR);
if power >= trigger {
self.in_burst = true;
self.quiet_run = 0;
@@ -85,7 +89,7 @@ impl VdesDecoder {
}
self.burst_samples.push(sample);
let sustain = (self.noise_floor * 3.0).max(1.2e-4);
let sustain = (self.noise_floor * BURST_SUSTAIN_NOISE_MULT).max(BURST_SUSTAIN_FLOOR);
if power < sustain {
self.quiet_run = self.quiet_run.saturating_add(1);
} else {