Mapped to a shared offline runtime family and usable with a recording or compatible ESP32 CSI stream.
Intended capability
Pilot this intended outcome through the shared Presence family, then validate it against site-specific ground truth: Long-horizon monitoring of building structure: detects millimeter-scale geometric creep (sagging joists, foundation settlement, delaminating facade panels, loosening racks) as sub-ns migrations of wall/ceiling reflection delays over weeks.
This describes the intended outcome. Readiness is shared-family mapped, evidence is class C, and a catalog mapping or recording is not proof of this outcome at a real site.
Solution blueprint
See the environment before installing it.
This exact kit is one of 191 first-class designs. It includes geometry, objects, nodes, wording, scenarios, installation, limitations, and catalog-bound readiness.
No rendered revision is available yet.
Bundled recording
A related Frontier scene
This is one recorded vertical scenario. It is not separate validation of every capability in the catalog.
01 The physics
A specular reflection off a structural surface has delay set by geometry to ~3.3 ps per mm of path change; super-resolved CIR delay tracking integrated over weeks can resolve slow displacement far below single-snapshot noise. Cracking/delamination also changes the layered-media reflection coefficient (amplitude/phase of that tap) even before gross displacement. Vibration modal frequencies of the element (Stage 2 band) shift when stiffness degrades.
02 Shared processing path
Stage 1 CIR sparse recovery pins per-surface reflection delays -> Stage 6 compartment Kalman per structural element with CUSUM over weeks separates true drift from thermal daily cycles (119-day drift control shows the baseline holds) -> Stage 2 micro-Doppler tracks ambient-vibration modal peaks of the element as a second stiffness observable -> Stage 5 eps_r/sigma map rules out moisture as the cause.
This is a capability design path. Components may be shared with other catalog entries; it is not presented as a unique algorithm.
03 Validation plan
Own-hardware: instrumented loaded shelf/joist testbed with micrometer displacement stage — command 0.5-5 mm displacements over days under realistic occupancy noise; verify CUSUM detection and displacement scaling. Leverage the 119-day drift-control deployment as the null baseline.
04 Commercial hypothesis
'A structural nervous system from your WiFi' — continuous settlement/creep telemetry for building owners, warehouse rack-safety programs, and post-earthquake triage, at 1/100th the cost of strain-gauge instrumentation.