FIELD: acoustic devices of active detection and ranging, designed for detection and ranging of bottom, objects in aqueous medium and bottom sediments. SUBSTANCE: introduced in the active sonar, having a synchronizer, delay circuit, square-pulse shaper, keys- DC amplifiers to electrolysis plates, hamonic oscillators, power amplifiers, acoustic pumping transducer, receiving transducer, difference frequency echo- signal receiver and a register, are the towed body, delay circuit and a key. EFFECT: enhanced directivity of low-frequency parametric radiation. 2 dwg
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