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EPIRB TX application update (#3120)

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This commit is contained in:
Frederic BORRY
2026-04-03 11:35:46 +02:00
committed by GitHub
parent 605c9efa0c
commit 03131c8a0c
4 changed files with 273 additions and 45 deletions
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firmware/baseband/proc_epirb_tx.hpp
+5 -2
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@@ -60,14 +60,17 @@ class EPIRBTXProcessor : public BasebandProcessor {
// Size of the frame to send in BPSK mode
uint8_t frame_data_len = 0;
// BPSK parameters: Target phase +/-63° as per COSPAS/SARSAT specifications
static constexpr float phase_rad = 63.0f * M_PI / 180.0f;
// BPSK parameters: Target phase +/-1.1 RAD as per COSPAS/SARSAT specifications
static constexpr float phase_rad = 1.1f;
// I/Q values for BPSK (positive phase and negative phase)
int8_t i_pos = (int8_t)(cos(phase_rad) * 127);
int8_t q_pos = (int8_t)(sin(phase_rad) * 127);
int8_t i_neg = i_pos;
int8_t q_neg = -q_pos;
// I/Q values for carrier only
static constexpr int8_t i_carrier = 127;
static constexpr int8_t q_carrier = 0;
// COSPAS/SARSAT signal is manchester (2 states per bit) encoded 400 bit/sec
static const uint32_t samples_per_halfbit = TONES_SAMPLERATE / 400 / 2;