Method and apparatus for detecting, locating, and...

Details Method and apparatus for detecting, locating, and... Method and apparatus for detecting, locating, and...

2006-11-28

2006-11-28

Sotomayor, John B. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Radar ew

C342S014000, C342S054000, C342S059000, C342S126000, C342S175000

Reexamination Certificate

active

07142147

ABSTRACT:
Methods and apparatuses for detecting, locating, and identifying microwave transmitters and receivers at distant locations are disclosed. First and second electromagnetic beams at first and second frequencies, respectively, are transmitted in first and second directions. The second frequency is offset from the first frequency to define an interference difference frequency. As such, the first and second electromagnetic beams interfere at a far field distance corresponding to an intersection of the first and second electromagnetic beams. In the far field the beams interfere with microwave devices that reradiate a return radiation at the difference frequency. The methods and apparatuses detect the return radiation at the difference frequency, such as by way of a receiver, and locate the interference zone to determine the location of the microwave device, such as by a processor.

REFERENCES:
patent: 4604638 (1986-08-01), Matsuda
patent: 5432605 (1995-07-01), Naqwi et al.
patent: 6512385 (2003-01-01), Pfaff et al.
patent: 6864825 (2005-03-01), Holly
patent: 2004/0120093 (2004-06-01), Holly
patent: 2005/0179611 (2005-08-01), Holly
patent: 2006/0109159 (2006-05-01), Holly

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