UNDERWATER DETECTION DEVICE, FISH FINDER, UNDERWATER DETECTION METHOD AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide an underwater detection device, a fish finder, an underwater detection method and a program which enable detection of a fish or a depth as well as determination of bottom sediment to be accurately performed with a single device.

SOLUTION: A fish finder 1 generates transmission signals for detecting a school of fish as well as for determining seafloor sediment through a transmission section 14. The fish finder 1 outputs the generated signals to a transducer 16 and the same: transmits ultrasonic waves for detecting the school of fish as well as for determining the seafloor sediment; and receives reflected waves thereof. The fish finder 1 enables a pulse width of a seafloor echo to be longer than the pulse width of a fish echo with respect to the received reflected waves and thereby detecting the school of fish and determining the seafloor sediment from each echo through a signal processing section 19.

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