| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain an underwater detector provided with the conventional function of a fish detector as it is and capable of clearly judging sea bottom quality. SOLUTION: A setting means 14, 15 and 16 of sensitivity and TVG (attenuation quantity correction) for judging sea bottom quality are provided besides setting means 11, 12 and 13 of sensitivity and TVG for fish detection. Also a means 17 setting a threshold judging whether or not a sea bottom reflection echo waveform based on directional angle information of a transmitter/receiver is provided. By comparing it with a sample waveform stored in advance in a sample waveform memory 18, sea bottom judgment is conducted.</p> |
