feat(wifi-densepose-sar): coherent wideband RF tomography research crate (ADR-283) - #1487
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…ate (ADR-283) New standalone leaf crate implementing the synthetic-aperture-radar reconstruction primitive a handheld through-wall RF imaging device would need: a stepped-frequency multi-position complex forward measurement simulator, delay-and-sum backprojection reconstruction, point-cloud extraction, and closed-form range/cross-range resolution + antenna-pose coherence-budget formulas checked against the reconstruction's actual behavior in tests/physics_validation.rs. Motivated by comparing this repo against Applied Electrodynamics' "WaveSight" launch. Scoped explicitly below ADR-278's RISE/DiffRadar/ GeRaF reproduction gates: this is the bare measurement-model + backprojection primitive, not a reproduction of any published system or a claim about real hardware capability. Every number is SYNTHETIC/L0 (ADR-282) -- no wideband RF hardware backs this crate. 24 tests (21 unit + 3 integration), 0 failed, clippy-clean. Adds a tutorial walkthrough and MEASURED backprojection benchmark numbers.
4 tasks
…on (~4.4-4.5x, MEASURED) focus_at_point called Complex64::from_polar (a sin/cos pair) once per (pose, frequency) term. FrequencySweep::frequencies() produces evenly spaced frequencies by construction, so the per-term phase is an arithmetic progression in the frequency index -- the phasor can be evaluated once per pose and advanced by a fixed complex-multiply step per frequency instead, turning K trig evaluations into 2. focus_at_point's signature changes from a raw &[f64] frequency slice to &FrequencySweep, so the evenly-spaced-frequencies precondition this optimization depends on is a type-level invariant rather than a caller-observed one -- an arbitrary non-uniform frequency list is no longer constructible through this API at all. MEASURED (criterion regression detection, p < 0.001): ~4.4-4.5x faster across 512/4096/32768-voxel grids (300us/1.97ms/14.5ms vs the prior 1.47ms/10.4ms/73.5ms). Proven equivalent, not just faster: a new test independently reimplements the direct per-frequency computation as a reference and checks the optimized path against it across four sweep sizes (incl. the n_steps=1 degenerate case) and both on-target and off-target points, to <1e-9 relative error. 25 tests (22 unit + 3 integration), 0 failed, clippy-clean.
…ion) ADR-283 was already taken by ADR-283-ruview-community-metaharness-flywheel.md, merged to main before this branch's work started -- picked without checking against main's actual current ADR list. Renumbered to ADR-287, the next free slot after ADR-286 (the wifi-densepose-sar-harness ADR, no collision there). Updated every reference across the crate (Cargo.toml description, lib.rs/ geometry.rs/measurement.rs/pointcloud.rs/reconstruct.rs/resolution.rs doc comments, tests/physics_validation.rs), its README, the tutorial doc, CHANGELOG.md, and the workspace Cargo.toml's member comment. 25 tests still pass after the rename (doc-comment-only changes, no logic touched).
The crates.io section claimed "All 16 crates are published at v0.3.0" -- stale even before this session (crates publish independently and had already drifted to 0.3.1-0.3.6). Replaced with an accurate framing (cargo add resolves each to its own latest) and added the new wifi-densepose-sar crate (ADR-287) to the list.
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Summary
New standalone leaf crate
wifi-densepose-sar(ADR-283) implementing the synthetic-aperture-radar reconstruction primitive a handheld through-wall RF imaging device would need — motivated by comparing this repo against Applied Electrodynamics' "WaveSight" YC launch.y_{m,k} = Σ σ_j/R² · exp(-i·4π·f·R/c) + noise), deterministic ChaCha20 seeding.ΔR=c/2B(range),δ_CR≈λR/2L(cross-range/synthetic-aperture),Δp≤λ/8(antenna-pose coherence budget) — checked against the reconstruction's actual behavior intests/physics_validation.rs, not merely documented.Honesty boundary (ADR-283 §3): every number is SYNTHETIC / evidence level L0 (ADR-282). No wideband RF hardware, VNA, or SDR integration exists anywhere in this crate or was added to
wifi-densepose-hardware. This is explicitly scoped below ADR-278's RISE/DiffRadar/GeRaF reproduction gates — the bare measurement-model + backprojection primitive, not a reproduction of any published system, and not a claim about Applied Electrodynamics' undisclosed product or real-world through-wall imaging performance. See the crate'ssrc/lib.rsdoc comment and README for the full scope statement.Also adds
docs/tutorials/coherent-rf-tomography-backprojection.md, a worked walkthrough of the physics and the crate's API.Test plan
cargo test -p wifi-densepose-sar --no-default-features— 24/24 passed (21 unit + 3 integration physics-validation tests)cargo clippy -p wifi-densepose-sar --no-default-features --all-targets— cleancargo bench -p wifi-densepose-sar— MEASURED throughput recorded in crate README (~350-450K voxels/sec, 21 poses × 32 freq steps)cargo build --workspace --no-default-features— full v2 workspace still builds clean with the new crate registered