Civil aviation passive coherent location system and method

Details Civil aviation passive coherent location system and method Civil aviation passive coherent location system and method

2006-03-14

2006-03-14

Swarthout, Brent A. (Department: 2636)

Communications: electrical

Aircraft alarm or indicating systems

C342S037000, C342S055000, C342S357490, C342S453000

Reexamination Certificate

active

07012552

ABSTRACT:
A civil aviation passive coherent location system and method is disclosed. A receiver subsystem receives reference transmissions from an uncontrolled transmitter. The receiver subsystem also receives scattered transmissions originating from the uncontrolled transmitter and scattered by an airborne object. The received transmissions are compared to determine measurement differentials, such a frequency-difference-of-arrival, a time-difference-of-arrival and an angle of arrival. From the measurement differentials, an object state estimate is determined. A previous state estimate may be updated with the determined state estimate. Processing subsystems determine the measurement differentials and state estimates.

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