| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a vehicle alarming device which can issue an alarm at an early time with no delay when the vehicle approaches. SOLUTION: A vehicle alarming device is composed of a transceiver 11, an amplifier 12, a comparator 13, a control circuit 14 and an alarm 15. In this alarming device, even though a signal cannot be received during a set impossible receiving period since an initial reflecting wave reflected by an obstacle is affected by a transmitted wave, a re-reflecting wave enters in an alarming distance so as to issue an alarm with no interruption. Accordingly, with the use of re-reflecting wave, it is possible to shorten the measuring distance.</p> |
