# 📐  L2 Spec — Radar Cross-Section — backscatter reconstruction Mismatch-Only Spec

**ID:** `L2-237-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-237`](/artifact/l1/L1-237)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41553991

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| Snr db | dB | -5 – 40 |
| N freqs | — | 1 – 512 |
| N angles | — | 36 – 36000 |
| Freq ghz | GHz | 0.1 – 300 |
| Freq error | — | 0.0 – 0.02 |
| Range error | — | 0.0 – 1.0 |
| Material error | — | 0.0 – 0.1 |
| Target orientation error | — | 0.0 – 0.1 |

## 2. Tolerance (ε)

**Type:** `fn`

```
1.5 + 10.0*target_orientation_error + 15.0*material_error - 0.04*SNR_dB
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |

## 4. Fingerprint

`6de6649bfb7d7c56bf28c5b86e9d9c228e848be7eb3e723760beadce959584b3`

## 5. On-chain Registration

- **Chain hash:** `0x845e6c14594fcd8bdb6155480d388ec188fd13ff8d52a96b480c878b66fcf27e`
- **Chain tx hash:** `0xc24462d447ad2efb3f5992749243fb21932b93468c7afe140f9e46e3b6b92d45`
- **Chain block:** `41553991`

---

## File Mapping

This bundle consists of: `L2-237-001.md`, `L2-237-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-237-001.md` | Source of truth — edit this | Human or LLM |
| `L2-237-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |

**Prompt for your LLM after editing this Markdown:**

> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.

_This Markdown was auto-synthesized from the catalog row for `L2-237-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._