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. 18, 2008
Filed:
Aug. 09, 2006
Raj Sodhi, Santa Rosa, CA (US);
Jay Prunty, Santa Rosa, CA (US);
George Hsu, Santa Rosa, CA (US);
Becky OH, Santa Rosa, CA (US);
Raj Sodhi, Santa Rosa, CA (US);
Jay Prunty, Santa Rosa, CA (US);
George Hsu, Santa Rosa, CA (US);
Becky Oh, Santa Rosa, CA (US);
PNI Corporation, Santa Rosa, CA (US);
Abstract
A magnetic compass apparatus and method to account for magnetic distortion while determining a magnetic heading is disclosed. The method enables a compass module, comprising at least two magnetometers, to characterize its magnetic environment dynamically, while collecting data of a geomagnetic field; a user moves an apparatus through various orientations; the environment may or may not contain magnetic distortion influences. Data gathered by magnetometers and, optionally, accelerometers are processed through at least two filters before being transferred as a processed data set for repetitive measurement calculations. A series of calculations is executed recursively in time by solving one or more linear vector equations using processed data.