Fish school detecting method or apparatus

Details Fish school detecting method or apparatus Fish school detecting method or apparatus

1987-04-21

1990-01-16

Tarola, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Determining distance

With pulse modulation

43 17, G01S 1306

Patent

active

048946613

ABSTRACT:
A fish school detecting method or apparatus radiates radio search signals with their carrier frequency in the S-band frequency range, successively in different azimuthal directions through a wide angular range, receives echo signals, and displays the echo signals on the screen of an indicator in such a manner that the echo signal reflected by a bird is clearly distinguished from the other objects, thereby locating the bird and detecting a fish school under the bird.

REFERENCES:
patent: 3114907 (1963-12-01), Luftman et al.
patent: 3427626 (1969-02-01), Losee
patent: 4038658 (1977-07-01), Nelson et al.
patent: 4199764 (1980-04-01), Williams et al.
patent: 4318101 (1982-03-01), Musha et al.
"The American Heritage Dictionary", Houghton Miflin Company; 1982; p. 916.

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