METHOD AND DEVICE FOR CORRECTING GAIN ERROR OF ACCELERATION SENSOR, DEVICE FOR DETECTING PRESENT POSITION FOR VEHICLE, AND NAVIGATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a technique capable of appropriately correcting a gain error irrespective of correction of an offset error of an acceleration sensor (a G sensor). SOLUTION: A gain correction factor K is determined by the following expression; K=[T2(Vn-Vn-1)-T1(Vn-1-Vn-2)].(αn-αn-1).T1.T2. Because the gain correction factor K is determined from a ratio of a differential of acceleration determined from an output of the G sensor T2(Vn-Vn-1)-T1(Vn-1-Vn-2) and a differential of acceleration determined from a GPS velocity, (αn-αn-1).T1.T2, the differential of the acceleration is taken and the offset error is negated even when the offset error is included in an output from the acceleration sensor. Thereby, the gain correction factor K is determined without considering the offset error, and there is no need to wait for execution of offset correction so that correction timing is not delayed.