On-vehicle position computing apparatus

Details On-vehicle position computing apparatus On-vehicle position computing apparatus

G - Physics

01

C

G01C 21/06 (2006.01) G01C 21/30 (2006.01) G01C 22/00 (2006.01)

Patent

CA 2078168

High degree of accuracy of the position of a vehicle can be ensured by maintaining the continuity of the running path of the vehicle and by correcting the vehicle position to a vehicle position measured by a GPS navigation system when an positional deviation occurs due to sensor errors. Specifically, the vehicle posi- tions are estimated in accordance with signals from sensors for detecting behaviors of the vehicle, and then the vehicle position is shifted onto a designated road having a feature coincident with that of the running path of the vehicle based upon data of the estimated vehicle positions. Further, the vehicle position is corrected to a position measured by use of a GPS receiver only when the cumulative value of distances of the positional shifts made by a number of cycles in past or in a predetermined running distance range exceeds a predetermined threshold value.

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