Multiplatform ambiguous phase circle and TDOA protection emitter

Details Multiplatform ambiguous phase circle and TDOA protection emitter Multiplatform ambiguous phase circle and TDOA protection emitter

1998-06-01

1999-12-07

Hellner, Mark

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

Directive

Beacon or receiver

342387, 342442, G01S 130, G01S 124

Patent

active

059991291

ABSTRACT:
A method and system for determining the geolocation--i.e., the latitude, longitude, and altitude--of a stationary RF signal emitter from two or more moving observer aircraft. The observers receive signals from the emitter and the system measures the phase difference between the signals. The observers then perform pulse time of arrival (TOA) measurements over a predetermined clock interval, and calculate the time difference of arrival (TDOA) of corresponding, same-pulse, emitter signals. Based on geometric relationships, the system creates a series of circular lines of position (LOPs) for each observer, and computes hyperbolic LOPs based on the TDOA calculations. The system determines emitter location from the intersection of the hyperbolic LOPs and the circular LOPs.

REFERENCES:
patent: 4734702 (1988-03-01), Kaplan
patent: 4797679 (1989-01-01), Cusdin et al.
patent: 5343212 (1994-08-01), Rose et al.
patent: 5526001 (1996-06-01), Rose et al.

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