Method and apparatus for calibrating a magnetic sensor
US8825426B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 2010 |
| Grant date | Sep 2, 2014 |
| Priority date | — |
| Expiry date | Jul 3, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/0035
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In general, the invention relates to an algorithm and process for automated and/or continuous calibration of magnetic sensor, for example such as a sensor installed in a mobile positioning system handset. According to certain aspects, the calibration process can use the normal motion of the handset such that all measurement data from the three orthogonal axes of sensor when exposed to Earth's magnetic field is collected. According to still further aspects, the process includes fitting measurement data to an ellipsoid that characterizes the actual magnetic field measurements from a magnetic sensor, so that anomalies such as hard iron effect, soft iron effect and scale factors can be extracted and/or corrected by comparison to a sphere represented by magnetic field data from a model at the sensor's location.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.