| 摘要 |
A tilt sensor, height sensors and tire pressure sensors sense a behavior of a parked vehicle and output an angle signal, a height signal and a pressure signal, respectively. These sensor signals are obtained by a sensor signal obtaining section. An initial value setting section sets an initial sensor signal of each of the tilt sensor, the height sensors and the tire pressure sensors as an initial value of that sensor. Then, a comparing section compares each initial value with the current sensor signal. Based on a result of the comparison, a determining section determines whether the vehicle is stolen.
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