| 摘要 |
PCT No. PCT/JP89/00910 Sec. 371 Date Apr. 27, 1990 Sec. 102(e) Date Apr. 27, 1990 PCT Filed Sep. 4, 1989 PCT Pub. No. WO90/02958 PCT Pub. Date Mar. 22, 1990.The present invention relates to an underwater detection system which radiates ultrasonic wave search signals by a transmitter disposed at a first point in the water, receives echo signals resulting from the search signals to detect underwater conditions, transmits information representative of underwater conditions to a second point spaced from the first point, and receives and displays the information representative of underwater conditions by a receiving transducer and an indicator. The transmitter disposed at the first point has a transmission side memory for storing echo signals, a device for writing the echo signals into the transmission side memory at periods which become longer as time elapses from an instant at which an ultrasonic wave search signal is radiated and for reading the stored echo signals out of the transmission side memory at constant periods.
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