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Epirb afc wide capture (#3213)

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* EPIRB RX: widen AFC capture range to +/-5 kHz

The AFC estimate was only applied after carrier lock, so carrier
acquisition ran on raw phase deltas and could only tolerate offsets of
a few hundred Hz before the 0.6/0.7/1.6 rad detection thresholds (on
the 12-sample accumulator) broke down.

Track the carrier offset continuously in the IDLE state with a
first-order loop (AFC_TRACK_ALPHA), so the de-biased accumulator
self-centers for any offset within the discriminator Nyquist (~24 kHz)
*before* the thresholds run. ALPHA = 0.005 pulls a +/-5 kHz offset
under the 0.6 rad lock threshold in ~11 ms, well inside the 160 ms
preamble / 80 ms stability window. The IDLE rise-detect threshold is
also made symmetric (fabsf) now that the bias is removed.

Also add the missing <cstdint> include to test_convert.cpp so the
application_test suite compiles under the current toolchain.

Verified: baseband_epirb_rx.elf builds (flash 53%, RAM 12%) and
baseband_test passes.
This commit is contained in:
Arne Luehrs
2026-06-11 11:01:54 +02:00
committed by GitHub
parent 6b5955e0b5
commit 569bcaad22
8 changed files with 1599 additions and 1479 deletions
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firmware/application/ui/ui_channel.cpp
+5 -1
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@@ -36,10 +36,14 @@ void Channel::paint(Painter& painter) {
const range_t<int> x_max_range{0, r.width() - 1};
const auto x_max = x_max_range.clip((max_db_ - db_min) * r.width() / db_delta);
const auto bar_style = (max_db_ >= overload_threshold_)
? Theme::getInstance()->fg_red
: Theme::getInstance()->fg_blue;
const Rect r0{r.left(), r.top(), x_max, r.height()};
painter.fill_rectangle(
r0,
Theme::getInstance()->fg_blue->foreground);
bar_style->foreground);
const Rect r1{r.left() + x_max, r.top(), 1, r.height()};
painter.fill_rectangle(