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Acoustic multipath structure in direct zone of deep water and bearing estimation of tow ship noise of towed line array

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Chinese Physics B 2022年第5期31卷 429-437页

作者： Zhi-Bin Han Zhao-Hui Peng Jun Song Lei Meng Xiu-Ting Yang Bing Su Unit 92578 of PLA China State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190China

In the towed line array sonar system,the tow ship noise is the main factor that affects the sonar *** noise cancelling methods assume that the noise is towards the endfire direction of the *** 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 *** tow ship noise is split into multiple noise signals whose bearings are distributed between 10°and 90°deviating from the endfire *** multiple interferences increase the difficulty in recognizing the target for the sonar operator and noise ***,making the mechanism clear and putting forward the tow ship noise splitting bearing estimation method are *** this paper,the acoustic multi-path structure of the tow ship in deep water is *** 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 ***,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 *** on the theory above,a method of estimating bearing of the tow ship noise in deep water is *** theoretical analysis results accord with the experimental results,which helps to identify the target and provide correct initial bearing guidance for noise cancelation methods.

关键词： deep water direct zone towed line array the tow ship noise

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Two-dimensional DOA estimation based on thin array towed by a small autonomous platform

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Journal of Measurement Science and Instrumentation 2021年第3期12卷 258-266页

作者： JIANG Jiajia YANG Guoliang LI Chunyue LI Yao WANG Xianquan SUN Zhongbo DUAN Fajie FU Xiao State Key Lab of Precision Measuring Technology and Instruments Tianjin University Tianjin 300072 China System Engineering Research Institute China State Shipbuilding Corporation Beijing 100036 China

The small autonomous platform with a thin line array is an important tool for underwater acoustic mobile ***,only one-dimensional(1-D)direction-of-arrival(DOA)of the source signal can be estimated using a thin towed line *** this work,the two-dimensional(2-D)DOA estimation is achieved by the thin line array towed by a small autonomous platform due to its flexible *** perpendicular tow paths are formed through the fast turning of this *** L-shaped array is formed by the same towed array on these two tow paths at different *** the array on these two straight paths,two 1-D DOAs of the source signal are obtained respectively,and then the 2-D DOA based on the formed L-shaped array can be *** effectiveness of proposed approach is verified by numerical simulations and its theoretical error is analyzed.

关键词： towed line array autonomous platform direction-of-arrival(DOA) underwater signal passive sonar

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