The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 15, 1991
Filed:
Jul. 30, 1990
Elisha M Kozikaro, Chicago, IL (US);
Motorola, Inc., Schaumburg, IL (US);
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.