Doppler discrimination of aircraft targets

Details Doppler discrimination of aircraft targets Doppler discrimination of aircraft targets

1980-12-22

1983-06-21

Buczinski, S. C.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 5HE, 343 5SA, G01S 1352, G01S 1300

Patent

active

043896472

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.

REFERENCES:
patent: 3733603 (1973-05-01), Johnston
patent: 4038656 (1977-07-01), Webb, Jr. et al.
patent: 4233605 (1980-11-01), Coleman
patent: 4241350 (1980-12-01), Uffelman
patent: 4275396 (1981-06-01), Jacomini

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