Method for measuring correction method of the geomagnetic sensor, the offset of the geomagnetic sensor, a portable information terminal and orientation data computing device

摘要

PROBLEM TO BE SOLVED: To provide a correction method for a geomagnetic sensor correcting an offset by magnetization, by only shaking the geomagnetic sensor on a horizontal plane, for example, and to provide a portable information terminal, capable of simplifying operation of the correction of the offset of the geomagnetic sensor by the use of a directional data arithmetic device that corrects the geomagnetic sensor.;SOLUTION: A user pushes a correction button (trigger ON) (step Sa1), instructs geomagnetism measurement (step Sa2), reads measurement data (step Sa3), and stores them to a RAM (step Sa4). It is decided whether a prescribed number of pieces of data are stored in the RAM (step Sa5), waiting is conducted each 0.1 sec (step Sa6), offset estimation is performed, when the storage of the data is completed (step Sa7), it is decided whether an estimated offset amount is effective (step Sa8), and the offset amount is updated, when it is effective (step Sa9).;COPYRIGHT: (C)2006,JPO&NCIPI