초록

Stealthcraft are detected by illuminating backgrounds with narrow radar or sonar beams and monitoring this background illumination for the changes that result when these beams are absorbed by such targets, and are ranged by triangulation using two such beams.

대표청구항 ▼

[ I claim:] [1.] An apparatus for detecting both stealth-modified and conventional targets where background returns are detectable, and comprising:(a) means for producing a first steerable narrow beam,(b) means for receiving the returns from said first steerable narrow beam,(c) sequence dependent di

[ I claim:] [1.] An apparatus for detecting both stealth-modified and conventional targets where background returns are detectable, and comprising:(a) means for producing a first steerable narrow beam,(b) means for receiving the returns from said first steerable narrow beam,(c) sequence dependent distinguishing means for distinguishing the background returns from said first steerable narrow beam from the returns from said targets,(d) means for constructing background images from said background returns, and(e) means for finding the dark patches in said background images that result when said first steerable narrow beam is at least one of absorbed, reflected and refracted by said targets.