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Update constants for M17 demodulation 

Constants were updated to increase performance based on baseband sample
collected with Module17.

TG-81
This commit is contained in:
Niccolò Izzo 2022-02-08 10:53:25 +01:00 committed by Silvano Seva
parent 2d8c696a09
commit ca49b306b9
2 changed files with 5 additions and 5 deletions
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6
openrtx/include/protocols/M17/M17Demodulator.h
View File

@ -112,9 +112,9 @@ private:
static constexpr size_t M17_SAMPLES_PER_SYMBOL = M17_RX_SAMPLE_RATE / M17_SYMBOL_RATE; static constexpr size_t M17_SAMPLES_PER_SYMBOL = M17_RX_SAMPLE_RATE / M17_SYMBOL_RATE;
static constexpr size_t M17_INPUT_BUF_SIZE = 2 * M17_FRAME_SAMPLES_24K; static constexpr size_t M17_INPUT_BUF_SIZE = 2 * M17_FRAME_SAMPLES_24K;
static constexpr size_t M17_FRAME_BYTES = M17_FRAME_SYMBOLS / 4; static constexpr size_t M17_FRAME_BYTES = M17_FRAME_SYMBOLS / 4;
static constexpr float conv_stats_alpha = 0.0001f; static constexpr float conv_stats_alpha = 0.001f;
static constexpr float qnt_stats_alpha = 0.99999f; static constexpr float qnt_stats_alpha = 0.99995f;
static constexpr float conv_threshold_factor = 3.70; static constexpr float conv_threshold_factor = 3.40;
static constexpr size_t M17_BRIDGE_SIZE = M17_SAMPLES_PER_SYMBOL * static constexpr size_t M17_BRIDGE_SIZE = M17_SAMPLES_PER_SYMBOL *
M17_SYNCWORD_SYMBOLS; M17_SYNCWORD_SYMBOLS;

4
openrtx/src/protocols/M17/M17Demodulator.cpp
View File

@ -101,7 +101,7 @@ void M17Demodulator::stopBasebandSampling()
void M17Demodulator::resetCorrelationStats() void M17Demodulator::resetCorrelationStats()
{ {
conv_ema = 0.0f; conv_ema = 0.0f;
conv_emvar = 1000000000.0f; conv_emvar = 800000000.0f;
} }
/** /**
@ -308,7 +308,7 @@ void M17Demodulator::update()
{ {
locked = true; locked = true;
isLSF = syncword.lsf; isLSF = syncword.lsf;
offset = syncword.index + 2; offset = syncword.index + 1;
} }
} }
// While we are locked, demodulate available samples // While we are locked, demodulate available samples