| 摘要 |
PROBLEM TO BE SOLVED: To automatically calibrate a magnetic sensor without users' awareness by eliminating the need for a special operation for calibrating the magnetic sensor by the users. SOLUTION: A main controller unit 20 (control means) measures bearings on the basis of geomagnetism detected by the magnetic sensor and automatically calibrates the magnetic sensor when operations for starting conversations such as the transmission or reception of communication, onhook, etc. are detected. The calibration is performed by storing measurement data captured from the magnetic sensor in a storage device, reading the measurement data stored in the storage device, estimating an offset according to a prescribed offset estimating algorithm, and determining whether an estimated offset value is valid or not. COPYRIGHT: (C)2006,JPO&NCIPI
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