| 摘要 |
An offset correction apparatus comprising a turning angular velocity sensor (43), a vehicle speed sensor (41) for outputting a pulsed signal every a constant distance traveled by a vehicle, stop determining means for determining a vehicle's stop, offset calculation means for integrating output data of the turning angular velocity sensor (43) during a period of the vehicle's stop determined by the stop determining means and then calculating an offset value of an output of the turning angular velocity sensor (43), storage means to store the offset value calculated by the offset calculation means, and heading correction means for correcting angular velocity data of the vehicle obtained from the output of the turning angular velocity sensor (43) or heading data obtained by integrating the angular velocity data, with the offset value, wherein when the pulsed signal from the vehicle speed sensor (41) disappears and the output from the turning angular velocity sensor (43) is less than a threshold, the stop determining means determines that the vehicle is at a stop. <IMAGE>
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