Radar Shadowing Lights Up Stealth
Radar shadowing, a new antistealth technique, is out of the closet. Airplanes and, presumably, missiles with low radar cross-sections apparently leave shadows in radar illumination reflected from their surfaces.
In December 1996, it became known that the Russian Academy of Sciences in 1992 had honored a team that detected such craft against a forest background. The United States recently tested a similar technique as part of the Defense Advanced Research Projects Agency's Mountain Top program, in which a radar atop a mountain simulates a next-generation airborne early warning set. Some mine-hunting sonars already use an analogous technique to detect mines with sonar-absorbing coverings.