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feat(sat): the sky engine — elements, look angles, passes, Doppler

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The foundation of the satellite branch, and nothing above it yet: where a
satellite is (SGP4 from akhenakh/sgp4, Apache-2.0 and pure Go, so the
no-cgo rule holds), where it will be (passes with an elevation floor,
because a three-degree scrape is a line in a table that will never be a
QSO), and what its motion does to a frequency.

The Doppler pair is the part worth being careful about: the two
corrections go in OPPOSITE directions. The downlink arrives shifted and
we tune to meet it; the uplink must LEAVE shifted the other way to land
on the transponder's nominal input. A test pins the signs and the size —
7 km/s on 2 m is about 3.4 kHz.

Elements keep their raw lines beside the parsed form: that is what the
cache stores and what an operator pastes by hand for a bird no feed
carries yet, which is exactly when everyone wants to hear it.
This commit is contained in:
rouggy
2026-09-07 10:36:56 +02:00
parent b0f76a8ba1
commit 2d71351080
4 changed files with 547 additions and 0 deletions
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go.sum
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@@ -1,5 +1,7 @@
filippo.io/edwards25519 v1.2.0 h1:crnVqOiS4jqYleHd9vaKZ+HKtHfllngJIiOpNpoJsjo=
filippo.io/edwards25519 v1.2.0/go.mod h1:xzAOLCNug/yB62zG1bQ8uziwrIqIuxhctzJT18Q77mc=
github.com/akhenakh/sgp4 v0.0.0-20260314155803-8ee03fc877eb h1:d9tZ7tJrssgs7Va9j8iu9vl7BlK2rmIs5RiOU7WQJrs=
github.com/akhenakh/sgp4 v0.0.0-20260314155803-8ee03fc877eb/go.mod h1:JfAepWD223Cel6uRpzYdip/xijWZ2FT457YFLWy8Md4=
github.com/bep/debounce v1.2.1 h1:v67fRdBA9UQu2NhLFXrSg0Brw7CexQekrBwDMM8bzeY=
github.com/bep/debounce v1.2.1/go.mod h1:H8yggRPQKLUhUoqrJC1bO2xNya7vanpDl7xR3ISbCJ0=
github.com/braheezy/shine-mp3 v0.1.0 h1:N2wZhv6ipCFduTSftaPNdDgZ5xFmQAPvB7JcqA4sSi8=