Graham McIntire
6d69989599
First HF prediction building block. GIRO publishes MUFD — the F2-layer maximum usable frequency at the 3000 km reference distance — directly from station measurements, already calibrated against CCIR M(3000)F2 climatology. Rather than recomputing MUF from scratch (which would require the ~2 MB CCIR coefficient tables), this module treats the measured MUFD as the anchor and scales it to the actual path distance using a thin-layer secant-of-incidence ratio. That keeps the measurement calibration (~3.3× foF2 at our fixture, vs ~5.1× from a naive thin-layer formula) and only uses the thin-layer math for the relative distance correction. * adjust_mufd/2 — scales MUFD(3000) to an arbitrary hop distance. At D=3000 it's a no-op; shorter paths get lower MUF (near-vertical), longer paths within the single-hop window get higher MUF. * fot/1 — standard 0.85 × MUF Frequency of Optimum Traffic. * hf_score/2 — 0-100 band-vs-MUF score with 5-tier curve: 100 (≤ 0.75×MUF) / 80 (FOT) / 50 (≤ MUF) / 20 (fringe) / 0 (dead). Limitations are in the moduledoc: single-hop only, nearest-station bias, no LUF/D-layer absorption, no Kp geomagnetic storm modeling. Those are separate commits once this has bake time. Not yet wired into PathLive — follow-up commit will add HF bands to BandConfig and wire the panel. |
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