An Autonomous Low-Frequency Broadb and Hydroacoustic Emitting Station with an Electromagnetic Transducer
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ICAL INSTRUMENTS FOR ECOLOGY, MEDICINE, AND BIOLOGY
An Autonomous Low-Frequency Broadb and Hydroacoustic Emitting Station with an Electromagnetic Transducer A. A. Pivovarova,*, I. O. Yaroshchuka, A. N. Shvyreva, and A. N. Samchenkoa a Il’ichev
Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, 690041 Russia *e-mail: [email protected] Received March 24, 2020; revised April 26, 2020; accepted April 27, 2020
Abstract—We describe the design of a hydroacoustic emitting station with an electromagnetic transducer that develops acoustic pressure of up to 2400 Pa (188 dB) reduced to a distance of 1 m from the emitter axis in a frequency range of 420–520 Hz (at the level of –3 dB); it has an operating depth of up to 500 m. The applied technical solutions make it possible to use the station for a wide range of oceanological research, as well as for the construction of navigation systems for underwater vehicles and data transmission via a hydroacoustic channel. DOI: 10.1134/S0020441220050334
INTRODUCTION One of the promising methods for solving the problems of acoustic tomography in the ocean is the sounding of the water environment using broadband coherent (frequency-modulated and phase-manipulated) hydroacoustic signals on stationary research routes. For the emission of signals of various types, the most convenient and practical technique is to use autonomous bottom hydroacoustic emitting stations [1]. Placing an emitter on an anchor or on the bottom makes it possible to stabilize the measurement routes of signal propagation, while the autonomy of the emitter allows one to work in an arbitrary water area without being tied to the coastal infrastructure. Employees of the laboratory of Statistical Modeling of the Pacific Oceanological Institute designed and manufactured an autonomous low-frequency broadband hydroacoustic station to conduct full-scale experiments on research problems in the field of oceanology and acoustic tomography. This article considers the design solutions and application of an autonomous low-frequency broadband hydroacoustic station with an electromagnetic transducer that creates an acoustic pressure of up to 2400 Pa in a frequency range of 420–520 Hz [2]; some results of oceanological investigations using this station, which were conducted on the shelf of the Sea of Japan in October 2019, are also presented. The main requirements for the station were as follows: minimization of mass and size characteristics (the total weight was more than 100 kg), autonomy of at least 3 days, the operating frequency range is 420– 520 Hz, the acoustic pressure in the operating range,
when reduced to 1 m, is at least 2000 Pa, the ability to synchronize with other devices, and the presence of a receiving hydrophone for recording acoustic signals. An additional option is the ability to use the autonomous emitting station as a repeater of hydroacoustic signals and a beacon for positioning underwater vehicles. Based on the requirements for autonomy, the mass and size characteri
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