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:
Mar. 22, 1994
Filed:
Dec. 27, 1991
Russell E Cage, Ann Arbor, MI (US);
Chrysler Corporation, Highland Park, MI (US);
Abstract
A method for selecting calibration data which uses mean square error to minimize variations in the calculated origins of the earth's magnetic field vector. A microcomputer having a memory calculates and stores the origin of the earth's magnetic field vector from the last three headings or data points. The x and y coordinates of the origins are summed with all the previous x and y coordinates and the mean square errors of the x and y coordinates are calculated. A figure of merit for the mean square errors is calculated. An adjusted origin is determined and stored by weighing the newly calculated origin by a figure of merit and adding it to the previous origin. Provision is made for reinitializing all quantities to zero when the sum of the mean square errors exceeds a predetermined maximum.