DIA Report Details Hypersonic Vehicle Detection Technologies

The organizing logic Rather than sorting detection methods by the type of vehicle being sought — meteor, reentry vehicle, ICBM payload, or aircraft — the DIRD groups them by the physical byproduct each method exploits. The table of contents lays this out plainly: electromagnetic methods (RADAR, Doppler RADAR, radio reflection), optical methods (sky cameras and photographic techniques, infrared detection, LIDAR), and acoustic and seismic methods (infrasound, seismic). A comparison figure near the document's close repeats the same architecture, listing each method against the properties it can detect — distance to target, velocity, altitude — and against whether it works over the whole sky or only along a directed line.

That choice carries an implicit argument. If detection is indexed to byproducts, then detectability is not a property of any particular airframe; it is inherited from the physics that any object moving at hypersonic speed necessarily produces. The document states the…