Method and apparatus for the detection of objects using electromagnetic wave attenuation patterns
First Claim
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.
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Accused Products
Abstract
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.
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Citations
20 Claims
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1. An apparatus for processing received radio frequency signals, comprising:
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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, and to 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for processing received radio frequency signals, comprising:
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concurrently receiving scattered modulated radio frequency signals with a plurality of receivers; storing scattering characteristics of radio frequency propagation paths of radio frequency signals detected at a plurality of receivers before said concurrently receiving, in a memory; processing the scattered modulated radio frequency signals concurrently received through the plurality of receivers together with the stored characteristics with at least one automated processor, to produce an output signal selectively dependent on both the scattering and the stored scattering characteristics of the radio frequency propagation paths; and automatically adapting over time, with the at least one automated processor, the stored scattering characteristics of the radio frequency propagation paths stored in the memory, in dependence on the scattered modulated radio frequency signals concurrently received through the plurality of receivers. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for processing received radio frequency signals, comprising:
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a plurality of receivers, configured to concurrently receive scattered modulated radio frequency signals from a plurality of transmitters; a memory configured to store scattering characteristics of radio frequency paths of radio frequency signals detected at a plurality of receivers, received prior to the concurrently received scattered modulated radio frequency signals; and an automated processor configured to process the scattered modulated radio frequency signals concurrently received through the plurality of receivers from the plurality of transmitters in conjunction with the stored scattering characteristics of the radio frequency paths, to at least; analyze scattering properties of the radio frequency paths, to adapt the stored scattering characteristics of the radio frequency paths stored in the memory based on the scattered modulated radio frequency signals concurrently received by the plurality of receivers, and to produce an output signal selectively dependent on the scattered modulated radio frequency signals concurrently received by the plurality of receivers.
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Specification