Accession Number : ADD008200

Title :   Doppler Discrimination of Aircraft Targets.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Fanuele,Michael A

Report Date : 22 Dec 1980

Pagination or Media Count : 14

Abstract : Two discriminator circuits are used with Doppler radars to indicate the type 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. (Author)

Descriptors :   *Patent applications, *Doppler effect, *Aircraft, *Doppler radar, Circuits, Spikes, Propellers, Modulation, Indicators, Frequency, Targets, Models, Discriminators, Signal processing, Radar beams

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE