A frontier proposal with a validation plan, not an implemented detector.
Intended capability
Research whether the field could support this proposed outcome: Corridor or doorway screening that flags when a person or cart carries a large concealed metallic object (toolbox, machete-class blade, long gun, stolen copper), without cameras or portals.
This describes the intended outcome. Readiness is research concept, 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
Metal is a near-perfect scatterer: a body-carried metal object creates a new, strong, polarization- and angle-dependent specular multipath component that a purely dielectric human body cannot produce. In the CIR this appears as an anomalously strong extra tap that moves rigidly with the tracked person, with scattering cross-section far above tissue.
02 Shared processing path
Stage 4 RTI tracks the moving person's position -> Stage 1 CIR sparse recovery detects a co-moving extra tap whose amplitude/delay is kinematically locked to the RTI track -> Stage 5 field reconstruction classifies the scatterer as conductor-like (sigma-dominated) vs dielectric -> in parallel, a doorway-aimed mmWave radar cone scores the same transit's return energy against the site's body-only baseline, an independent second modality on the tracked pass -> Stage 3 anomaly manifold fuses both scores against the site's normal 'people + phones + keys' baseline; neither modality classifies the object.
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 corridor rig: N subjects walking with/without concealed metal plates of graded area (0.005-0.1 m^2), report ROC vs object size; sanity-check tap-detection machinery on OPERAnet/WiMANS walking traces.
04 Commercial hypothesis
'Camera-free anomaly screening at every doorway' — loss-prevention and campus-security teams get a metal-object tripwire that takes two independent looks at every transit, with zero biometric data collected. Plus tier: each screened doorway carries an aimed mmWave radar alongside the mesh. Neither modality classifies the object — the flag says something anomalous passed and where it went, never what it was.