| 摘要 |
A motor vehicle sends a train of laser light pulses with a fixed repetition period and receives the pulses reflected from a preceding vehicle. The received pulses are converted to an electrical signal and applied to a gate circuit gated with the repetition period of the laser light pulses and with a time delay determined by the speed of the vehicle. Those signal portions resulting from the received pulses and passed through the gate circuit are held in peak value and integrated providing an intervehicular distance indication.
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