UNCASED HYDROACOUSTIC ANTENNA Russian patent published in 2014 - IPC G01S7/52 

FIELD: radio engineering, communication.

SUBSTANCE: acoustic receivers are mounted on the outer surface of sound transparent envelopes made of elastic material, wherein the shape of the envelopes is provided by filling the inner volume with liquid under pressure, wave impedance of which is slightly different from the wave impedance of the working medium. The frame of the antenna used is a sound transparent envelope made of elastic composite material, the shape of which is provided by filling the inner volume of the envelope with working fluid. Water-impermeable envelopes for water-filled frames can be made based on modern materials. A water-filled antenna comprises receiving units in the form of extended sections which hold acoustic receivers with small wave dimensions, pre-amplifiers and electrical (optical) links. The receiving units are sealed with a polymer material and are mounted on the outer surface of the antenna by ropes. Uncased large-size antenna arrays form a rigid geometrical shape by filling the inner volume with working fluid under excess pressure. The excess pressure is generated by a hydraulic pump.

EFFECT: higher efficiency of hydroacoustic stations, high efficiency of the antenna, particularly a large aspect angle and concentration factor in a wide frequency band, low sonar visibility, material consumption, weight and cost.

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