Article

Article title TO THE ISSUE OF BUILDING BROADBAND HYDROACOUSTIC ANTENNAS OF COMMUNICATION AND OBSERVATION SYSTEMS
Authors P. P. Pivnev, S. P. Tarasov, V. A. Voronin
Section SECTION III. METHODS AND MEANS OF FLAW DETECTION AND NON-DESTRUCTIVE TESTING
Month, Year 08, 2017 @en
Index UDC 621.3721.54; 534.222
DOI 10.23683/2311-3103-2017-8-128-139
Abstract Discussed are the questions of designing of broadband hydroacoustic arrays for underwater monitoring and hydroacoustic data transmission. There are several ways to extend the bandwidth of acoustic transducers and arrays. Presented are the results of studies demonstrating the possibil-ity of designing a broadband array. Special attention is given to the possibility of the construction of broadband hydroacoustic arrays, consisting of different frequency converters, mechanical related field. A 3D model of the sectoral hydroacoustic array for receiving and transmitting data, consisting of different-frequency converters, is mechanically coupled along the field. For example, the calculations of impedance characteristics of such arrays are presented. Calculated is the frequency dependence of the active component of the array impedance. Theoretical calculations are confirmed by the experimentally obtained frequency dependences of the active component of the impedance of the layout channels and the dependences of the active component of the impedance of the layout with parallel connection of the channels. Experimentally measured sensitivities in the reception and emission mode of the layout in the operating frequency range are presented. The geometry of the problem for calculating the sector of the antenna with arcs arranged along the arc is presented. The results of calculations and experimental studies in the hydroacoustic basin of the direction characteristic of the arc array are presented. It is concluded that, the use of different frequency converters allows you to not only solve the problem of designing a broadband array of the communication systems for underwater vehicle, but have approximately the same directivity of the array in a wide frequency range. In the overall context of the characteristics of broadband parametric sonar arrays, the principle of which is based on the use of the effect of nonlinear inter-action of acoustic waves. The results of experimental investigations of amplitude-frequency char-acteristics of the broadband parametric antennas are presented. As an example, the use of linear-frequency-modulated signals in broadband parametric hydroacoustic array is proposed to create a signal with a spatial-frequency dependence.

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Keywords Broadband signal; unmanned underwater vehicle; hydroacoustic monitoring; acoustic communications; information transfer; parametric hydroacoustic array.
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