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:
Feb. 09, 2021
Filed:
Nov. 06, 2018
Invensense, Inc., San Jose, CA (US);
Gennadii Berkovich, Calgary, CA;
Dmitry Churikov, Calgary, CA;
InvenSense, Inc., San Jose, CA (US);
Abstract
Systems and methods are disclosed for automatically calibrating a magnetometer during user activity. A portable device associated with a user provides magnetic field measurements during user activity, which are converted to a frequency domain and frequency component(s) that correspond to the user activity are distinguished. A criterion is defined for the distinguished frequency components such that magnetometer bias is estimated by satisfying a condition for the criterion. Accordingly, the estimated magnetometer bias may be applied to the obtained magnetic field measurements. The calibrated magnetic field measurements may be used for any suitable purposes, including for building a magnetic fingerprint map using crowdsourcing techniques.