44 lines
1.9 KiB
Markdown
44 lines
1.9 KiB
Markdown
# 01 — Physics-floor primitives
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Bedrock physics that bounds everything else in the loop. Three primitives:
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## Scripts
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| Script | Thread | Headline |
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|---|---|---|
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| `r1_toa_crlb.py` | R1 | 20 MHz HT20 @ 20 dB SNR ToA CRLB: 41 cm single-shot, 4 cm with 100× averaging. Phase vs ToA: 238× advantage with cycle-slip resolution. |
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| `r6_fresnel_zone.py` | R6 | First-Fresnel envelope at 5 m link, 2.4 GHz: 40 cm wide ellipsoid at midpoint. Per-subcarrier phase predictions for 4 canonical scatterer scenarios. |
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| `r6_1_multiscatterer.py` | R6.1 | 6-scatterer human body model. Multi-scatterer penalty: **+4.7 dB** worse than idealised single-scatterer (matches R13's 5-dB shortfall to 0.3 dB). |
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## Why this folder bounds the rest
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- **R1 CRLB** sets the temporal-resolution floor for any localisation feature.
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- **R6 Fresnel** gives the spatial envelope of CSI sensitivity (~40 cm wide at 5 m link).
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- **R6.1 multi-scatterer** extends R6 from point-scatterer to realistic distributed body; quantifies the gap between idealised and real physics.
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Together: physics floors that bound R6.2 family (placement), R12 family (structure detection), R14 (vitals), R20 (quantum integration).
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## Sample output
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```
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=== R6 first Fresnel radii (m) ===
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freq lambda link p=0.10 p=0.25 p=0.50 p=0.75 p=0.90
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2.4 124.9mm 5.0m 0.237 0.342 0.395 0.342 0.237
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=== R6.1 multi-scatterer penalty ===
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Single-scatterer ideal: +23.7 dB
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Multi-scatterer (6 body parts): +19.0 dB
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Penalty: +4.7 dB
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```
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## Honest scope
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- All numbers are best-case physics; real CSI has additional noise channels.
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- Body model is 6 point-scatterers; real body is distributed continuous RCS.
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- 2D (top-down) approximations; 3D extensions live in `02-placement/`.
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## See also
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- Loop research notes: `docs/research/sota-2026-05-22/R{1,6,6_1}-*.md`
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- Used by: `02-placement/`, `03-spatial-intelligence/`, `06-structure-detection/`, `09-quantum-fusion/`
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