| 摘要 |
PURPOSE:To measure the geography and depth of a water bottom precisely even in a rapid current of a river by dipping an antenna in water and moves, and radiating an electromagnetic wave from the antenna and measuring its echo. CONSTITUTION:When the geography and depth of a river or swamp 1 are measured, the antenna 8 is moved while being dipped under the water surface 3. An electromagnetic wave pulse is radiated from the antenna 8 every time it moves by specific distance, and its echo is measured to obtain information on the direction of depth. The technology of a very short range radar is applicable to a device which radiates the electromagnetic wave pulse. There is fresh water in the river and swamp differently from the sea and the depth is relatively shallow, so measurement which uses the electromagnetic pulse is applicable. Consequently, even when a measuring method which uses an ultrasonic wave can not be applied, the measurement is performed efficiently.
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