Accurate magnetic compass in mobile electronic device
US8880373B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 2009 |
| Grant date | Nov 4, 2014 |
| Priority date | — |
| Expiry date | Dec 17, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C17/38
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods and apparatus are described herein for calibration and correction of non-constant sensor errors, and in particular non-constant compass errors, that are based in part on changing software and hardware modes of a host device. The non-constant errors induced in the sensor by each mode and combination of modes is determined in a calibration that may be determined during pre-production testing of one or more host devices. The calibration results can be incorporated into software and/or hardware of the host device. During normal operation, a sensor correction can be applied to sensor measurements based in part on the active mode or combination of modes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.