Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Aeronautical vehicle
Patent
1998-08-18
1999-09-28
Cuchlinski, Jr., William A.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Aeronautical vehicle
701 4, G06F 1500
Patent
active
059579820
ABSTRACT:
A method that allows a space vehicle to determine navigation information represented by the contents of a state vector. The method includes the steps of intermittently receiving navigation signals, initializing the state vector with an estimate of the navigation information, and generating a predicted state vector that represents the predicted values for the navigation information after a predetermined time increment in the future. The method further determines whether a navigation signal has been received within a predetermined window of time from a navigation beacon. If a navigation signal has been received, the method updates the state vector and the contents of the state vector are propagated forward in time to provide an estimate of the navigation information after a predetermined time increment. In some instances, however, a navigation signal is not received within the predetermined window of time. In such situations, the method simply propagates the contents of the predicted state vector forward in time. Thus, the predicted state vector maintains an estimate of the current navigation information even in the absence of a navigation signal.
REFERENCES:
patent: 5109346 (1992-04-01), Wertz
patent: 5528502 (1996-06-01), Wertz
patent: 5717404 (1998-02-01), Malla
Busby Michael
Galloway Arnold J.
Hanson Mark L.
Hughes George C.
Kang Bryan H.
Beaulieu Yonel
Cuchlinski Jr. William A.
TRW Inc.
Yatsko Michael S.
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