| 主权项 |
1. A relocation detection method for detecting relocation of an apparatus comprising the steps of:
providing a relocation detection device comprising an acceleration sensor, a flag setting unit, an arithmetic unit, a correction unit, and a detection unit, wherein the acceleration sensor is attached to the apparatus; setting a relocation detecting flag in the flag setting unit when the relocation detection device has been turned on; determining, with the arithmetic unit, in a state that the relocation detecting flag has been cleared, whether the detected values of the acceleration sensor are each within a measuring range, and when the detected values of the acceleration sensor are each within the measuring range, obtaining, with the arithmetic unit, a first calculation value by performing Nth-order integration on the detected values of the acceleration sensor, from which a moving average value obtained from the detected values has been each subtracted for removing an influence of a temperature drift of the acceleration sensor, at a predetermined timing, wherein N is a predetermined positive integer; obtaining, with the correction unit, a second calculated value by removing an offset value due to an influence of the temperature drift of the acceleration sensor, failed to be removed in the step of obtaining the first calculation value, from the first calculation value at the predetermined timing; and detecting, with the detection unit, that the apparatus has been relocated if the second calculated value exceeds a preset reference value or any of the detected values of the acceleration sensor is not within the measuring range. |
