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. 29, 2016
Filed:
Jun. 18, 2014
Applicant:
Stmicroelectronics (China) Investment Co. Ltd., Shanghai, CN;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01C 17/38 (2006.01); G01C 17/28 (2006.01); G01R 33/00 (2006.01);
U.S. Cl.
CPC ...
G01C 17/38 (2013.01); G01C 17/28 (2013.01); G01R 33/007 (2013.01); G01R 33/0082 (2013.01);
Abstract
Apparatus and methods to compensate hard iron and soft iron magnetic interference in magnetic sensing devices are described. Hard and soft iron interference may be modeled using an ellipsoidal surface generated by a plurality of magnetic field measurements. A displacement of the ellipsoid from a reference frame origin corresponds to hard iron or permanent magnetic field interference. A shape and orientation of the ellipsoid corresponds to soft iron magnetic field interference. The ellipsoidal surface may be analyzed to obtain magnetic field compensation values for cancelling hard iron and soft iron interference.