Horizontal fish detection sonar

Details Horizontal fish detection sonar Horizontal fish detection sonar

1974-08-20

1976-04-13

Farley, Richard A.

Communications: electrical

Selective

Monitoring in addition to control

G01S 968, G01S 970

Patent

active

039507246

ABSTRACT:
A horizontal fish detection sonar comprising an ultrasonic transducer emitting an ultrasonic wave spreading in a vertical plane, a plural number of receiving transducers arranged within the angle of the spreading ultrasonic wave, a control device permitting signals from said receiving transducers to be sampled in succession for a short time .DELTA.t after a predetermined time T from the emission of said ultrasonic wave, and a display device displaying said sampled signals in succession, is capable of detecting the depth of water, a target (a school of fish), or an obstruction at any determined distance from the present location in the emission direction of said ultrasonic wave.

REFERENCES:
patent: 3039079 (1962-06-01), Walters et al.
patent: 3212055 (1965-10-01), Grieg

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