FIELD: underwater acoustic equipment, underwater acoustic means incorporating parametric receiving antennas in their mix for search for fish. SUBSTANCE: gear includes generator, power amplifier directed in vertical and horizontal planes, high-frequency pumping signal radiator directed in vertical and horizontal planes mechanically linked to multielement receiving antenna whose electroacoustic converters have high- frequency resonance in their amplitude-frequency characteristics, adder, electron signal processing unit incorporating band-pass high-frequency filter whose central frequency corresponds to high-frequency pumping signal and to one of high-frequency resonance in amplitude-frequency characteristic of electroacoustic converters, amplifier, amplitude detector, low-frequency filter and low-frequency amplifier connected in series. Output of low-frequency amplifier is output of electron signal processing unit and is connected to input of spectrum analyzer. Mechanical scanning of antenna in vertical and horizontal planes is conducted with the aid of special fixture. EFFECT: increased noise immunity and stability. 6 dwg, 1 tbl
