Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Reexamination Certificate
2005-08-23
2005-08-23
Phan, Dao (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
C342S442000
Reexamination Certificate
active
06933888
ABSTRACT:
A system is provided for rapidly ascertaining the position of a pulse train emitter such as a radar using multiple collectors without requiring more than one platform to measure the same pulse. Thus time-of-arrival measurements at a number of collecting platforms are performed, with the positions of the platforms being accurately ascertainable using GPS data, and with time synchronization between the spaced-apart collectors performed by utilizing atomic clocks. In the multi-ship case, geolocation can be performed on ten milliseconds of data as opposed to 30 seconds of data for measurements involving a single platform. The subject system is preferable to conventional time-difference-of-arrival geolocation systems because those systems require that each of the collecting platforms measure the same pulse from the emitter, which severely constrains the flight paths of the collectors, limits the amount of usable data, and increases the system's sensitivity requirements.
REFERENCES:
patent: 5119104 (1992-06-01), Heller
patent: 5191342 (1993-03-01), Alsup et al.
patent: 5708443 (1998-01-01), Rose
patent: 2004/0002347 (2004-01-01), Hoctor et al.
patent: 2004/0203870 (2004-10-01), Aljadeff et al.
Adler Henry
Carroll Melvin
Schiffmiller Richard
Bae Systems Information and Electronic Systems Integration Inc.
Long Daniel J.
Phan Dao
Tendler Robert K
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