Article

Article title ADAPTIVE HYDROACOUSTIC MEANS FOR SEAWATER MONITORING
Authors I. A. Kirichenko
Section SECTION I. HYDROACOUSTIC METHODS FOR ECOLOGICAL MONITORING OF THE OCEAN
Month, Year 08, 2017 @en
Index UDC 534.222
DOI 10.23683/2311-3103-2017-8-63-70
Abstract Monitoring of marine areas is an important task, the solution of which, first of all, is aimed at the safety of the vessels and facilities in question, as well as the task of monitoring underwater conditions in the water area of offshore technological facilities in general. In foreign countries such problems are solved using the hydroacoustics, which work by the principle of radiation into the controlled volume of the marine environment of acoustic signals, their subsequent reception, detection and recognition of echoes reflected from underwater objects. Accumulation and analysis in real time of information obtained by the hydroacoustic instrument on underwater conditions allow monitoring of marine areas, detecting changes in the underwater situation throughout the controlled volume, determining small-sized objects and their characteristics, such as the direction of travel, the trajectory and the speed of movement. As a result of the analysis of the main tactical and technical characteristics of foreign hydroacoustic instruments designed to monitor the underwater situation in the coastal waters, the directional properties of the acoustic systems of these facilities have been assessed, and the conditions and hydrophysical characteristics of the marine environment that should be taken into account when designing such hydroacoustic means have been determined. As a promising source of radiation of acoustic waves, the possibility of using a parametric radiating antenna is considered. The necessary directional properties of single pump emitters of the parametric antenna have been evaluated to form a total radiation pattern with a circular viewing sector in the horizontal plane, and the directional properties of the low-frequency receiving antenna have been estimated. Calculations have been performed that made it possible to establish the necessary compensation for the directivity characteristics of the emitting parametric antenna in the vertical plane.

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Keywords Sea area; parametric antenna; sector of view; direction characteristic.
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