Vehicle position determining apparatus

Details Vehicle position determining apparatus Vehicle position determining apparatus

1990-07-30

1991-10-15

Chin, Gary

Boots, shoes, and leggings

364449, 364457, 340988, 33356, G06F 1550

Patent

active

050580230

ABSTRACT:
Vehicle position determining apparatus (10) uses dead reckoning to calculate new vehicle position and heading (A2, H2) based on prior position and heading (A1, H1). Computer (11) separately calculates heading changes (.DELTA.H.sub.od, .DELTA.H.sub.c) as measured by a pair of differential wheel sensors (16, 17) and a magnetic compass (15) and uses these heading changes to calculate assoicated lateral accelerations of the vehicle (LA.sub.od, LA.sub.c) over a time and/or distance interval (.DELTA.t, .DELTA.d). If calculated lateral acceleration, or rate of vehicle turn, exceeds a maximum predetermined limit value, and this is therefore indicative of unstable or improbable vehicle operation, heading change data which resulted in calculation of excessive lateral acceleration is probably erroneous and will not be substantially utilized to calculate new vehicle position and heading.

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Philips Technical Review, "Carin, A Car Information and Navigation System", vol. 43, No. 11/12, Dec. 1987.
"Transportation for the Future, Automobile Navigation Technology: Where Is It Going?", Robert L. French, May 24-25, 1988.

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