| 摘要 |
<p>The method involves controlling an oscillating circuit to generate an activation radio signal such that oscillation rise time (T1) is varied depending on randomly generated parameter. A power supply of the circuit is controlled depending on the parameter, and an expected system run time is determined depending on the parameter. Duration from activation of the circuit till receiving of a release signal in a control unit is measured, and the duration is compared with the expected time. A locking system is not released when the duration varies from the expected time above a preset value.</p> |
