Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Receiver
Patent
1996-06-04
1998-04-07
Eldred, J. Woodrow
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Receiver
342 62, 342 97, 342196, 342 89, G01S 1300
Patent
active
057369569
ABSTRACT:
A coherent radar receiver that has pulse-to-pulse coherence using an unlocked voltage controlled oscillator, such as a Gunn voltage controlled oscillator. The present invention is a W-band, for example, bistatic receiver that uses a scanning sum channel antenna to scan the target, a downconverter for downconverting received alternating sum and difference pulse echoes from the bistatic illuminator to provide video signals, and processing circuits for processing the downconverted the video signals to precisely locate the null position on the target. A Fourier transform circuit, magnitude detector and a peak detection and centroid circuit are used to generate a voltage frequency control output signal that is applied to the voltage controlled oscillator or local oscillator that controls its frequency. An angle estimation algorithm is used that processes the video signals to locate the null offset from the center of a scan pattern generated by the antenna. The present invention thus provides for an inexpensive weapon receiver at W-band, for example, using an inexpensive unlocked voltage controlled oscillator. The pulse-to-pulse coherence achieved by the receiver permits precise location of a target of interest from bistatic radar returns.
REFERENCES:
patent: 4088997 (1978-05-01), Winderman
patent: 4334224 (1982-06-01), Gordon
patent: 4679207 (1987-07-01), Tsuda
patent: 5339084 (1994-08-01), Watanabe et al.
patent: 5473331 (1995-12-01), Kennedy et al.
patent: 5594450 (1997-01-01), Schober
Kennedy Thomas A.
Kirkorian Kapriel V.
Rosen Robert A.
Alkov Leonard A.
Denson-Low Wanda K.
Eldred J. Woodrow
Hughes Electronics
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