METHOD OF DETERMINATION OF POSITION OF TRAWL RELATIVE TO SHOAL OF FISH IN COURSE OF TRAWLING Russian patent published in 1996 - IPC

FIELD: commercial fishery; check of characteristics and trawl system in course of trawling. SUBSTANCE: determination of position of trawl relative to shoals of fish is effected by means of radiation and reception of acoustic impulses; finding of fish is effected simultaneously with location of one or several acoustic reflectors or receivers-transponders mounted on trawl or trawl beams at simultaneous representation of signals of acoustic reflectors or receivers-transponders received from trawl or trawl beams on display of horizontal action fish finder together with echo signals from fish shoals. EFFECT: enhanced reliability. 2 dwg