Method and apparatus for the detection of objects using electromagnetic wave attenuation patterns

摘要

A method for detecting an object, comprising the steps of defining expected characteristics of scattered electromagnetic radiation to be received at a receiver; attenuating at least a portion of electromagnetic radiation received at the receiver by a presence of an object within a path of electromagnetic information; and detecting the attenuation to indicate a presence of the object. The object may be a low radar profile object, such as a stealth aircraft. The electromagnetic radiation is preferably microwave, but may also be radio frequency or infrared. By using triangulation and other geometric techniques, distance and position of the object may be computed.

主权项

1. An apparatus for processing received radio frequency signals, comprising:
a plurality of receivers, configured to concurrently receive scattered modulated radio frequency signals; a memory configured to store scattering characteristics of radio frequency propagation paths of radio frequency signals detected previously to the concurrently received scattered modulated radio frequency signals, at the plurality of receivers; and a processor configured:
to process the scattered modulated radio frequency signals concurrently received through the plurality of receivers, in dependence on the stored scattering characteristics, to produce an output signal selectively dependent on both the processed scattered modulated radio frequency signals and the stored scattering characteristics of the radio frequency propagation paths, andto adapt the stored scattering characteristics in dependence on changes over time of the received scattered modulated radio frequency signals concurrently received through the plurality of receivers.