| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fish finder removing interference from another ultrasonic device without impairing a useful echo from a small target such as single fish and a target moving in a depth direction. Ž<P>SOLUTION: The echo data at the present time to be subjected to interference removal processing are compared with the echo data with the maximum signal intensity from among the echo data obtained by the previous transmission and reception and belonging to a depth range including the echo data at the present time. The echo data with the smaller signal intensity are output as the interference-removed echo data for the echo data at the present time to be subjected to interference removal processing. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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