Title: Doppler discrimination of aircraft targets

Abstract: Two discriminator circuits are used with Doppler radars to indicate the t of aircraft in the radar beam based on the modulating effect of the aircraft rotor or propeller on the Doppler return signal. The increase in the Doppler signal when a rotor or propeller becomes orthogonal to the incident radar beam causes a spike in the detected Doppler signal. The frequency of such spikes is an indication of the make and model aircraft being observed and the circuitry comprises means for sensing such frequency and operating one of a plurality of indicators if such frequency corresponds to that of a known rotor or propeller frequency of a particular make and model aircraft corresponding to that indicator.

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Inventors: Fanuele, Michael A. (Toms River, NJ)
Mccray, Joseph A. (Freehold, NJ)
Rittenbach, Otto F. (Neptune, NJ)

Application Number: 06/219455
Filing Date: 1980-12-22
Publication_date: 1983-06-21
Assignee: Army US.

Primary Class(es): 342/192 342/194
Other Classes: G01S7/41; G01S13/58; G01S7/02; G01S13/00; G01S13/00; G01S13/52
US Patent Ref:

3733603	May, 1973	Johnston	343/5SA	RADAR TARGET IDENTIFICATION SYSTEM
4038656	July, 1977	Webb, Jr. et al.	343/5HE	Helicopter discrimination apparatus for the murine radar
4233605	November, 1980	Coleman	343/5HE	Helicopter radar decoy
4241350	December, 1980	Uffelman	343/5SA	Radar target pattern recognition system using logarithmic analysis
4275396	June, 1981	Jacomini	343/5SA	Helicopter rotating blade detection system

Other Refs:
Primary Examiner: Buczinski S. C.
Assistant Examiner:
Attorney: Gibson, Robert P.
Murray, Jeremiah G.
Golberg, Edward

Claims: