Title: Dual channel correlator for an FM-CW ranging radar

Abstract: A method and apparatus for eliminating the sidelobe ambiguity in the range esponse of an FM-CW radar. An FM-CW signal with a periodic modulation frequency is transmitted and reflected from a target, received and combined with a sample of the transmitted signal to provide a combination signal. A portion of this combination signal including a selected harmonic and next adjacent harmonic is amplified and mixed with reference signals comprising the selected harmonic and next adjacent harmonic to provide two separate difference signals. These signals are in turn low pass filtered and further mixed to provide a range response with a mainlobe of one polarity and all side lobes of an opposite polarity. The energy under the mainlobe is detected and integrated to provide a voltage signal. When this voltage signal reaches a preset threshold level a further signal is generated.

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Inventors: Parkhurst, Ross A. (Bethesda, MD)
Rodkey, David L. (Kensington, MD)
Wedel, John O. (Ellicott City, MD)

Application Number: 06/196409
Filing Date: 1980-10-14
Publication_date: 1983-06-21
Assignee: US ARMY AS REPRESENTED BY THE

Primary Class(es): 342/189 342/193, 342/200
Other Classes: G01S13/34; G01S13/00; G01S13/02
US Patent Ref:

2931030	March, 1960	Rey	343/17.5	Radar system
3079557	February, 1963	Crabtree	343/5HM	Transponder
3444509	May, 1969	Rubega et al.	343/5HM	SONAR SYSTEM
3719946	March, 1973	Sletten et al.	343/17.5	RADAR PHASE COMPARISON SYSTEM INCLUDING A SUPERHETRODYNE RECEIVER
3725917	April, 1973	Sletten et al.	343/17.5	RADAR PHASE COMPARISON METHOD AND SYSTEM FOR OBJECT RECOGNITION
3798642	March, 1974	Augenblick et al.	343/5HM	RECOGNITION SYSTEM
4313216	January, 1982	Jaeger et al.	343/5HM	Dual frequency radar receiver

Other Refs:
Primary Examiner: Hubler, Malcolm F.
Assistant Examiner:
Attorney: Edelberg, Nathan
Gibson, Robert Saul Elbaum P.
Elbaum, Saul

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