Positioning method, computer program, positioning device,...

Details Positioning method, computer program, positioning device,... Positioning method, computer program, positioning device,...

2011-06-14

2011-06-14

Tarcza, Thomas H (Department: 3662)

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

Directive

Including a satellite

C342S357280

Reexamination Certificate

active

07961146

ABSTRACT:
A positioning method in a positioning device that calculates a location of the positioning device by executing Kalman filtering includes, acquiring a satellite signal from a positioning satellite; predicting a state vector including a velocity component of the positioning device, and error covariance of the state vector; correcting the velocity component using a difference between a measured value and a predicted value of the reception signal frequency from the positioning satellite; determining accuracy of the corrected velocity component based on the error covariance; setting a velocity condition based on the determined accuracy; judging a moving state of the positioning device by comparing the corrected velocity component and the velocity condition; and calculating the location by executing the Kalman filtering with a filter characteristic changed according to the judged moving state.

REFERENCES:
patent: 6516021 (2003-02-01), Abbott et al.
patent: 2004/0150557 (2004-08-01), Ford et al.
patent: 2001-337156 (2001-12-01), None

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