Vehicle navigator for calculating distance based on mean acceleration

摘要

In a vehicle navigator using an acceleration sensor for detecting a running distance, the precision of measuring the running distance is intended to be improved. Output data of the acceleration sensor during a predetermined time duration is stored in an output storage, and the average value or "mean acceleration" of output data is calculated by a mean acceleration calculator A running distance calculator calculates a difference between the acceleration measured with the acceleration sensor and the mean acceleration calculated by the mean acceleration calculator, and this difference is double integrated to obtain the running distance.