STEP COUNT DETECTION DEVICE USING GEOMAGNETIC SENSOR, PROGRAM AND METHOD

摘要

PROBLEM TO BE SOLVED: To provide a step count detection device, a program and a method counting as accurate as possible a step count even if a pedestrian walks with a mobile terminal on hand. SOLUTION: The step count detection device detects the step count of the pedestrian carrying the device by the use of three-axis geomagnetic data output from a geomagnetic sensor. The device includes: a change angle calculation means calculating a change angle from a nearest angle of a geomagnetic vector from the geomagnetic data corresponding to a time lapse; a local minimum detection means detecting a time point when the change angle reaches a local minimum; and a step count counting means counting a plurality of time points when the change angle reaches the local minimum as the step count. The change angle calculation means calculates a cosine aifrom the geomagnetic vector on a preceding time tiand the geomagnetic vector on a succeeding time ti+1, and the local minimum detection means can detect a time point when the cosine aireaches a local maximum. COPYRIGHT: (C)2011,JPO&INPIT