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Physics scrutiny of WiFi-band maritime sensing scenarios. Steel skin depth is 3.25 um at 2.4 GHz, making bulkheads utterly opaque. Saltwater attenuation is 853 dB/m. The 'through-bulkhead WiFi radar' framing common in conservation/maritime is wrong; the actual feasible category is 'through-seam' sensing exploiting slot diffraction through gaskets, hatch seals, and vent grilles. Composite link budget for 7 maritime scenarios (ESP32-S3 121 dB budget, 10 dB SNR margin): FEASIBLE: - Man-overboard surface @ 200 m: +25 dB - Cabin door, 2 mm seam: +31 dB - Cabin door, 5 mm seam: +39 dB - Container, 30 mm vent slot: +45 dB IMPOSSIBLE: - Closed 10 mm steel door: -938 dB - Submarine pressure hull: -929 dB - Head 30 cm underwater: -231 dB Five feasible verticals catalogued: man-overboard surface, through-seam crew vitals, container tamper detection, hatch-seal predictive maintenance, engine-room thermal anomaly via condensation. Composes with prior threads: - R6 Fresnel envelope + slot diffraction = narrower composite envelope - R10 link-budget primitives reused unmodified for air-side maritime - R7 multi-link consistency essential against superstructure jammers - R14 privacy framework transfers directly to crew-cabin monitoring Honest scope: best-case ignores vessel vibration (5-30 Hz, in-band with R10 gait frequencies), engine ignition noise, salt-spray, steel-surface multipath. Maritime gait-classification is harder than land. The romantic 'through-hull radar' is now explicitly debunked. The actual product roadmap is gasket-leakage sensing, surface detection, and predictive-maintenance audits. Coordination: ticks/tick-10.md, no PROGRESS.md edit.
59 lines
2.8 KiB
Markdown
59 lines
2.8 KiB
Markdown
# Tick 10 — 2026-05-22 05:46 UTC
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**Thread:** R11 (maritime / through-bulkhead sensing)
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**Verdict:** Physics scrutiny re-frames "through-bulkhead" to "through-seam" — the romantic submarine-radar vision is impossible at WiFi bands; the actual product category is **gasket-leakage sensing**.
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## What shipped
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- `examples/research-sota/r11_maritime_propagation.py` — pure-numpy skin-depth + lossy-dielectric saltwater + slot-diffraction physics for 7 maritime scenarios.
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- `examples/research-sota/r11_maritime_results.json` — machine-readable predictions.
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- `docs/research/sota-2026-05-22/R11-maritime-sensing.md` — research note with the physics, verdicts table, feasible/infeasible verticals, honest scope, composition with prior threads.
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## Headline (verdict table)
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| Scenario | Verdict | Margin |
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| Man-overboard surface @ 200 m | ✅ | +25 dB |
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| Through 10 mm closed steel door | ❌ | -938 dB |
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| Through cabin door **2 mm seam** | ✅ | **+31 dB** |
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| Through cabin door **5 mm seam** | ✅ | +39 dB |
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| Container w/ 30 mm vent slot | ✅ | +45 dB |
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| Submarine 30 mm pressure hull | ❌ | -929 dB |
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| Head 30 cm underwater | ❌ | -231 dB |
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Key physics: steel skin depth = **3.25 µm at 2.4 GHz** (impassable). Saltwater = **853 dB/m**. The loophole is **slot diffraction** through gasket seams.
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## Feasible verticals catalogued
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1. Man-overboard surface detection (200 m range)
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2. Through-seam crew vitals (lone-watch monitoring without compromise)
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3. Container tamper detection (cargo security)
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4. Hatch-seal integrity audit (predictive maintenance)
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5. Engine room thermal-anomaly detection (via condensation envelope)
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## What this matters for the loop
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R11 is the first thread that **explicitly debunks** a romantic 10-20y framing. The "through-bulkhead" terminology used in the original PROGRESS.md is physically wrong; the actual category is "through-seam". Replacing one vision with a more honest one is the kind of progress this loop is meant to surface.
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Composes cleanly:
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- R6 Fresnel envelope + slot diffraction = narrower composite envelope
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- R10 link-budget primitives reused unmodified for air-side maritime
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- R7 multi-link consistency essential for adversarial-resistant maritime
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- R14 privacy framework transfers directly to crew-cabin monitoring
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## Honest scope landed
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- Best-case ignores vessel vibration, engine ignition noise, salt-spray, multipath
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- Vibration (5-30 Hz) is **in-band** with R10's gait frequencies — maritime gait-classification harder than land
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- No GPS in steel compartments — alternative positioning needed
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## Coordination
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`ticks/tick-10.md`. No PROGRESS.md edit. Branch `research/sota-r11-maritime`.
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## Remaining threads
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R3 (cross-room re-ID), R4 (federated), R13 (contactless BP — likely negative-result candidate), R15 (RF biometric).
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~6.3h to cron stop. 10 threads landed.
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