Correction method for vehicle-mounted geomagnetic field sensors

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364457, 33356, G01C 1738, G06F 1550

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active

046601619

ABSTRACT:
A correction method for a geomagnetic field sensor (11) of a bearing indication system (10) mounted on a vehicle including a signal processor (13) for processing an output signal (Vx, Vy) of the sensor. The signal processor includes a storing function (15), comprising steps of storing the output signal of the sensor as data (6) of the bearing of the vehicle, while the vehicle is traveling, and computing a bearing correction vector (Xoff, Yoff) for correcting the output signal of the sensor on the basis of the stored bearing data. When the vehicle is judged to be subjected to a strong magnetic field, the bearing data stored may be all cleared. The bearing correction vector may be updated each time when a predetermined period of time is elapsed or the vehicle has traveled a predetermined distance.

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