DEVICE AND METHOD FOR MEASURING DISPLACEMENT

摘要

PROBLEM TO BE SOLVED: To accurately estimate the displacement of a measuring object using the acceleration signal outputted from an acceleration sensor mounted on the measuring object. SOLUTION: The acceleration sensor 2 measures the acceleration of the measuring object 1. A computing device 3 computes a parameter corresponding to the displacement by integrating the measured acceleration of the measuring object 1 twice, estimates a drift component contained in the parameter corresponding to the displacement from the computed result of the parameter corresponding to the displacement on the basis of such a characteristic that the drift component contained in the parameter corresponding to the displacement increases or decreases monotonically, and computes the displacement signal by subtracting the estimated drift component from the parameter corresponding to the displacement.