Compass sensor unit and portable electronic device

Details Compass sensor unit and portable electronic device Compass sensor unit and portable electronic device

2008-09-08

2009-10-20

Le, John H (Department: 2863)

Data processing: measuring, calibrating, or testing

Calibration or correction system

C033S356000, C342S357490, C701S224000, C702S092000

Reexamination Certificate

active

07606676

ABSTRACT:
In a compass sensor unit, an azimuth data computing method is carried out by the steps of: inputting a signal from a geomagnetic sensor to measure magnetic field; determining whether to store measurement data of the magnetic field based on a distance from the last stored measurement data; calculating an offset value based on the stored data; making a comparison for each component of a plurality of measurement data used for calculating the offset value, and judging the offset value to be valid when a difference between the maximum and minimum values of each component is a given value or more; updating the already stored offset value to the offset value judged to be valid; and correcting newly provided measurement data by the updated offset value to compute azimuth data.

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