|Article title||SYSTEM OF DATA TRANSMISSION IN THE HYDROACOUSTIC CHANNEL USING THE PRINCIPLES OF NONLINEAR ACOUSTICS|
|Authors||V. Yu. Vishnevetskiy, D. A. Kolesnik, I. B. Starchenko|
|Section||SECTION I. METHODS AND MEANS OF ACOUSTIC MONITORING|
|Month, Year||06, 2018 @en|
|Abstract||The article deals with the issues of underwater acoustic communication using parametric arrays. High-speed data transmission using hydroacoustic means is an urgent problem, because it is the only type of communication for underwater applications. This problem was solved earlier, the first stations appeared during the second world war. However, the increase in the volume of information and modern technical capabilities allow us to take a fresh look at this task. The development of a modern sound transmission system consists of several separate items: the development of hydroacoustic devices that can provide the required broadband for the transmission of audio and video information; the development of digital electronic tools and software to ensure speed, security and minimize errors. This article discusses the first problem, namely the design of the hydroacoustic radiating transducer. The problem of broadband is proposed to be solved with the help of parametric acoustic antennas operating on the physical effects of nonlinear interaction of elastic waves in the aqueous medium. It is shown that such antennas are not only free from the disadvantages of traditional acoustic emitters, but also have a number of advantages, namely, small size, uniformity of amplitude-frequency characteristics, selectivity of radiation and broadband. Calculations are performed using the basic equation of hydrolocation modified for sound-conducting communication systems at different values of the recognition coefficient: to ensure the minimum and maximum quality of communication. Calculations have shown that, despite the main drawback of parametric antennas-low efficiency - the system can provide the range required to solve the tasks. The operation of the system in two modes: low – frequency 0.5-2 kHz and high-frequency 20-30 kHz is considered. In this case, the range was from 0.8 to 1.8 km in low-frequency mode and from 6 to 10.5 km in high-frequency mode. The SEMA of realization of a sound-conducting communication with the use of a parametric antenna is offered. In conclusion, the conclusion is made about the advantages of such antennas and the possibility of building a one-way communication system with a single diver or a group within a shallow and small water area (up to 10 m in depth and up to 1 km in distance).|
|Keywords||Sound transmission; broadband, parametric array; hydrolacation equation; range; quality of communication.|
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