# DATA PROVENANCE — E4-H160

## Datasets used

**None.** This project uses no external data, no measured values, and no downloaded files.

All inputs are (a) physical constants and (b) design parameters chosen by the investigator and stated
in `METHODS.md` and in the script header. They are therefore *assumptions*, not data, and the
distinction is made deliberately: nothing here can be "reproduced against a dataset" because there is
no dataset.

## Parameters (all stipulated, none fitted)

| Parameter | Value | Why this value |
|---|---|---|
| Array pitch `d` | 2.00 µm | typical for an integrated OPA |
| Design angle θ₀ | 20° | avoids the grating-lobe edge, keeps cos θ₀ ≈ 0.94 |
| λ₀ | 684.0 nm | follows from `λ₀ = d sin θ₀`; not independently chosen |
| Grating order | 1 | simplest operating point |
| N | 256–8192 | spans the aperture range of current devices |
| Peak SNR | 20 dB | keeps the CRB above the delay grid so T3 is meaningful |
| Samples per chirp | 4096 | fixed across B, so `Δf` varies with B |

Every one of these can be changed, and the *scalings* (T1, T2) are invariant to them. The constants
are not.

## What would count as real data for this project

A bench measurement of a dispersive-OPA lidar with a target at known range, recording the raw
beat signal and the measured beam envelope. The decisive analysis is the one described in
`README.md` ("Next decisive test"): process the *same* record with and without the envelope weighting
and compare the delay scatter above `B_eff`.

## Prior-art sources

Only web search result metadata was used (titles and snippets). **No full text was retrieved**, and
no numerical claim in this project is taken from a publication. Where a source is named
(`PRIOR_ART.md`), it is named as an unverified pointer, not as support.