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:
Nov. 24, 1992
Filed:
Oct. 29, 1990
Duc C Nguyen, Salem, OR (US);
IIMorrow, Inc., Salem, OR (US);
Abstract
An electronic flux gate compass calibration method and apparatus. An electronic flux gate compass mounted on a terrestrial vehicle is first rotated 360 degrees by driving the vehicle in a circle to determine four reference points where the locus of points representing the orthogonal outputs of the compass crosses over the X and Y axes of a reference Cartesian coordinate system. These four reference points are employed to calibrate the orthogonal outputs of the compass and compute a calibrated compass heading. Thereafter, as the vehicle moves from place to place, the output of the compass is monitored. If the output is within a predetermined region around one of the reference points, the reference point is modified to be closer to that output point. When the vehicle has moved through a closed loop, i.e., rotated a net 360 degrees, the compass is recalibrated.