Angle-of-arrival measurement via time doppler shift

Details Angle-of-arrival measurement via time doppler shift Angle-of-arrival measurement via time doppler shift

1992-09-03

1993-08-31

Tubbesing, T. H.

Communications: directive radio wave systems and devices (e.g.,

Radar ew

342387, G01S 1350

Patent

active

052413136

ABSTRACT:
To allow measurement of the angle-of-arrival (AOA) of the radar pulses from an uncooperative ground-based emitter, the method exploits the time doppler shift resulting from the velocity of a high performance aircraft and the high maneuver ability available to such aircraft to form initial angle calculations. These initial angle calculations along with inherent radar stability are then used for subsequent AOA measurements. The aircraft is flown at a constant velocity V.sub.B along successive legs with an angle .phi..sub.K between successive legs, and the velocity V.sub.B and the angles .phi..sub.K are found using a navigation system such as GPS or inertial navigation. The time difference T.sub.n '-T.sub.1 ' is measured between the arrival of the first and last of n pulses for each sample. A general approximation equation of T.sub.n '-T.sub.1 ' is normalized such that for any K samples the following equation applies,

REFERENCES:
patent: 3866229 (1975-02-01), Hammack
patent: 4008470 (1977-02-01), Lanning et al.
patent: 4172255 (1979-10-01), Barrick et al.
patent: 4393382 (1983-07-01), Jones
patent: 4549184 (1985-10-01), Boles et al.
patent: 4746924 (1988-05-01), Lightfoot
patent: 4825213 (1989-04-01), Smrek

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