github ruvnet/RuView v1061
Release v1061

latest releases: v1136, v1133, v1115...
6 hours ago

Automated release from CI pipeline

Changes:
research(R6): Fresnel-zone forward model — bedrock physics for CSI sensitivity (#710)

The workspace DSP (vital_signs, multistatic, pose_tracker, tomography)
implicitly assumes a forward model that maps scatterer geometry to
per-subcarrier phase shifts. Nobody had written it down. This tick
makes it explicit.

Closed-form first-Fresnel-zone radius + point-scatterer path-delta +
per-subcarrier phase prediction over 802.11n/ac 20 MHz channels (52
subcarriers, 312.5 kHz spacing). Pure NumPy demo + JSON output for
downstream consumers.

Headline numbers:

  • 5 m link first-Fresnel radius @ midpoint: 40 cm (2.4 GHz), 27 cm (5 GHz)
  • Inside zone-1: phase spread <0.5 deg across 52 subcarriers (band-flat)
  • Outside zone-1: phase spread up to 16 deg (band-dispersed)

This unifies R5 + R6: R5's experimentally measured band-spread top
subcarriers is exactly what the Fresnel forward model predicts for
zone-1 occupancy.

Closes the loop on three earlier threads:

  • R7 (mincut adversarial) gets a precise definition of 'physically
    inconsistent' instead of a learned classifier
  • R10 (foliage range) needs to retract 100 m sparse estimate to ~70 m
    to account for Fresnel-zone obstruction
  • R12 (eigenshift negative result) gets its revision basis: PABS over
    Fresnel-grounded forward operator

Honest scope: point-scatterer only, first Fresnel only, frequency-flat
reflectivity, LOS-only (no multipath). The scalar version is the right
first-order approximation; volume-integral / multi-zone / multipath
extensions catalogued as R6.1+R6.2 follow-ups.

Coordination: ticks/tick-8.md, no PROGRESS.md edit.

Docker Image:
ghcr.io/ruvnet/RuView:650612e5a26385d2562f2886a9539c814c3ce819

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