| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Acoustic multipath structure in direct zone of deep water and bearing estimation of tow ship noise of towed line array |
| Zhi-Bin Han(韩志斌)1,†, Zhao-Hui Peng (彭朝晖)2, Jun Song(宋俊)1, Lei Meng(孟雷)1, Xiu-Ting Yang(杨秀庭)1, and Bing Su(苏冰)1 |
1 Unit 92578 of PLA, China;
2 State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract In the towed line array sonar system, the tow ship noise is the main factor that affects the sonar performance. Conventional noise cancelling methods assume that the noise is towards the endfire direction of the array. An acoustic experiment employing a towed line array is conducted in the western Pacific Ocean, and a strange bearing-splitting phenomenon of the tow ship noise is observed in the array. The tow ship noise is split into multiple noise signals whose bearings are distributed between 10° and 90° deviating from the endfire direction. The multiple interferences increase the difficulty in recognizing the target for the sonar operator and noise cancellation. Therefore, making the mechanism clear and putting forward the tow ship noise splitting bearing estimation method are imperative. In this paper, the acoustic multi-path structure of the tow ship in deep water is analyzed. Then it is pointed out that the bearing-splitting phenomenon is caused by the main lobe of direct rays and bottom-reflected rays, as well as several side lobes of direct rays. Meanwhile, the indistinguishability between the elevation angle and the bearing angle due to the axial symmetry of a strict horizontal line array causes the bearing to deviate from the endfire direction. Based on the theory above, a method of estimating bearing of the tow ship noise in deep water is proposed. The theoretical analysis results accord with the experimental results, which helps to identify the target and provide correct initial bearing guidance for noise cancelation methods.
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Received: 12 August 2021
Revised: 02 November 2021
Accepted manuscript online:
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PACS:
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43.30.Cq
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(Ray propagation of sound in water)
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43.60.Fg
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(Acoustic array systems and processing, beam-forming)
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43.60.Jn
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(Source localization and parameter estimation)
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| Fund: Project supported by the National Defense Basic Science Research Program,China (Grant No.JCKY2016607C009) and the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No.2018025). |
Corresponding Authors:
Zhi-Bin Han,E-mail:593344287@qq.com
E-mail: 593344287@qq.com
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| About author: 2021-11-4 |
Cite this article:
Zhi-Bin Han(韩志斌), Zhao-Hui Peng (彭朝晖), Jun Song(宋俊), Lei Meng(孟雷), Xiu-Ting Yang(杨秀庭), and Bing Su(苏冰) Acoustic multipath structure in direct zone of deep water and bearing estimation of tow ship noise of towed line array 2022 Chin. Phys. B 31 054301
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