Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1998-06-01
1999-06-22
Tarcza, Thomas
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342424, G01S 504
Patent
active
059146877
ABSTRACT:
A method for determining the geolocation--i.e., the latitude, longitude, and altitude--of a stationary emitter emitting an RF signal. The method employs at least one moving observer to measure electrical phase change of the emitter over two or more successive dwell intervals, and at least two observers, moving or stationary and of known position, to determine the pulse time of arrival of the emitter signal. The phase change measurements are taken using a long baseline interferometer (LBI), and the pulse time of arrival measurements are calculated using short baseline interferometers (SBI). Circles of position are generated from bearing change measurements ascertained from the LBI phase change measurements, and hyperbolic lines of position are generated based on the SBI measurements. The position of the emitter is then determined from the intersection of the circles and lines of position.
REFERENCES:
patent: 5343212 (1994-08-01), Rose et al.
patent: 5526001 (1996-06-01), Rose et al.
patent: 5592181 (1997-01-01), Cai et al.
patent: 5596330 (1997-01-01), Yokev et al.
Coonan, Esquire Scott J.
Litton Systems Inc.
Phan Dao L.
Tarcza Thomas
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