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).
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.
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.
ruv