Underwater detector and method capable of calculating fish quantity information on school of fish

An underwater detector comprising a section (3) for transmitting an ultrasonic signal into water in a predetermined direction from the hull, a section (4) for receiving reflection echos from a school of fish (FS) originating from the transmitted ultrasonic signal by a receiving beam, and a section (...

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Bibliographic Details
Main Authors KOHJI IIDA, YASUSHI NISHIMORI, EMI OKAZAKI
Format Patent
LanguageEnglish
Published 30.05.2007
Subjects
ANALOGOUS ARRANGEMENTS USING OTHER WAVES
DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES
LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES
MEASURING
PHYSICS
RADIO DIRECTION-FINDING
RADIO NAVIGATION
TESTING
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Summary:An underwater detector comprising a section (3) for transmitting an ultrasonic signal into water in a predetermined direction from the hull, a section (4) for receiving reflection echos from a school of fish (FS) originating from the transmitted ultrasonic signal by a receiving beam, and a section (5) for processing the signal of the receiving beam. The signal processing section (5) calculates the fish quantity information on the school of fish FS by integrating the input conversion acoustic intensity obtained by the receiving beam in a predetermined three-dimensional direction.
Bibliography:Application Number: GB20070004964