The measurement of signal transmission time is a critical technique for Radar and Sonar System.

信号传输时间的测量，是雷达、声纳系统的关键技术之一。

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Time delay is retard of signal transmission.

所谓时滞是指信号传输的延迟。

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If the time interval among the transmissions is long enough for each time, the fading presented by the transmission of the signal will be mutual for each time.

如果各次发送的时间间隔足够大，那么各次发送信号所出现的衰落将是彼此的。

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