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ruvnet
47 lines
4.3 KiB
Markdown
47 lines
4.3 KiB
Markdown
# ADR-278: Radar inverse rendering + differentiable RF SLAM — a gated research program, not a dependency
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| Field | Value |
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|-------|-------|
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| **Status** | Proposed — research program (deliberately **no code in P1**) |
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| **Date** | 2026-07-26 |
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| **Parent** | ADR-273 (pillar 6, score 3.6 — highest strategic value, highest hardware + reproduction risk) |
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| **Relates to** | ADR-275 (the Gaussian memory these methods would write into), ADR-263/264 (RTL8720F radar platform + wire protocol), ADR-021 (mmWave vitals hardware), ADR-276 (synthetic worlds as the reproduction sandbox) |
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## 0. PROOF discipline
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Everything numeric in this ADR is **EXTERNAL-UNVERIFIED** — reported by fresh papers/preprints that this repo has not reproduced. That is the point of this ADR: to fix the reproduction gates *before* any of these numbers are allowed to influence the roadmap as if they were ours.
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## 1. Context — what the field reports (July 2026)
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| System | Claim (theirs) | Availability | Risk read |
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|---|---|---|---|
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| **RISE** | Single static mmWave radar + multipath inversion → joint room layout + furniture; 16 cm scene Chamfer (baseline 40 cm), 58 % furniture IoU | code available | most reproducible; static sensor matches our appliance posture |
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| **DiffRadar** | Radar SLAM + Gaussian fields + differentiable rendering; 0.129 m vs 0.823 m ATE, 94.78 % vs 42.59 % map consistency, 70 fps, 40 MB maps | fresh preprint | treat as **reproduction target, not component** — numbers are single-team, single-venue |
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| **GeRaF** | Differentiable RF renderer + SDF + reflectivity, near-range reconstruction; ~32 h on one H100 for 50 k iterations | published setup | offline calibration / digital-twin tool only; unsuitable for continuous adaptation |
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The strategic pull is real: all three converge on *inverse rendering into continuous scene representations* — exactly the ADR-275 memory. The risks are equally real: single-source numbers, mmWave hardware variance, and compute profiles (GeRaF) incompatible with edge deployment.
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## 2. Decision
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1. **No production dependency** on any of these systems or their claims. ADR-275's gain model + inverse update is the only RF-inverse machinery in the deployment path.
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2. **Reproduction order: RISE → DiffRadar → GeRaF-lite**, each on one controlled test site, each gated (§3) before the next starts. RISE first because a static radar matches the RuView appliance posture and its inversion writes naturally into `RfGaussian` (occupancy + reflectivity fields already exist for it).
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3. **Sandbox-first**: before hardware, each method's core inversion is exercised against ADR-276 synthetic worlds extended with a radar-cube output mode (the `FmcwRadarCube` adapter already normalizes such cubes), so failures separate into "our reimplementation" vs "their claim" cleanly.
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4. **Integration contract**: any reproduced system emits into `GaussianMap` via the existing primitive — no parallel scene store. SLAM trajectories, if any, become `Provenance`-stamped map updates subject to ADR-277 export rules like everything else.
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## 3. Gates (each phase passes all or the program pauses)
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| Gate | Threshold | Split discipline |
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| G1 RISE-repro (synthetic) | layout Chamfer within 2× of paper's on our synthetic rooms | held-out room geometries |
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| G2 RISE-repro (one real site) | qualitative layout recovery + quantified Chamfer vs measured floor plan; report *our* number, whatever it is | site never used in tuning |
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| G3 DiffRadar-repro | ATE and map consistency on our trajectory rig; publish the delta vs paper | held-out trajectories |
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| G4 Edge viability | inversion or map-update loop ≤ 50 ms p95 on target hardware, or explicit reclassification as offline-calibration tooling (GeRaF's honest category) | — |
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A gate failure is a *result*, recorded in this ADR's log — the program exists to convert EXTERNAL-UNVERIFIED into MEASURED, in either direction.
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## 4. Consequences
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- The roadmap cannot silently absorb preprint numbers; anything radar-inverse must pass through §3.
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- ADR-275's primitive already reserves the fields (per-band × angle reflectivity, occupancy, motion) these methods need, so a successful reproduction integrates without schema churn.
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- Cost of delay is accepted: pillar 6 scored lowest on readiness, and P1–P4 (encoder, memory, synth, control plane, SRS) do not depend on it.
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