Fish finder

Details Fish finder Fish finder

1995-10-02

1997-01-14

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367107, G01S 1596

Patent

active

055947077

ABSTRACT:
A receiver converts an echo received by a transducer to a supersonic echo signal, and a controller measures the depth of obstacles depending on a timing for receiving the supersonic echo signal, obtains an echo level according to quantity of the supersonic echo signal, and determines the condition of the bottom depending on echo levels of a series of supersonic echo signals. A display unit provides a result of detection at a position of corresponding depth scale on a first display area for providing graphic displays of the obstacles as well as the bottom with a depth scale with a gradation or a pattern type corresponding to the echo level. Graphic displays of the echo level are also provided at a position corresponding to depth on a second display area having graphic displays corresponding to depth scale in the first display area.

REFERENCES:
patent: 4829492 (1989-05-01), Choi et al.
patent: 4829493 (1989-05-01), Bailey
patent: 5065371 (1991-11-01), Leavell et al.
patent: 5184330 (1993-02-01), Adams et al.
patent: 5327398 (1994-07-01), Wansley et al.

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