Robust Broadband Beam-Forming Based on the Feature of Underwater Target Radiated Noise

• Published in: China ocean engineering Vol. 30; no. 6; pp. 1004 - 1011
• Main Author: 陈新华 刘超 余华兵 郑恩明 孙长瑜
• Format: Journal Article
• Language: English
• Published: Nanjing Chinese Ocean Engineering Society 01.12.2016; Springer Nature B.V; Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China%Haiying Enterprise Group Co., Ltd., Wuxi 214061, China%Appsoft Technology Co., Ltd., Beijing 100085, China
• Subjects: Background noise; Broadband; Coastal Sciences; Dimensional analysis; Engineering; Fluid- and Aerodynamics; Forming; Marine & Freshwater Sciences; Noise; Numerical and Computational Physics; Oceanography; Offshore Engineering; Simulation; Statistical methods; Target detection; Technical Notes; Theoretical analysis; Underwater; 二阶锥规划; 加权因子; 加权方法; 噪声特性; 宽带波束形成; 水下目标辐射噪声; 空间谱; 输出信噪比; information processing technology; main-to-side lobe ratio; target detection; broadband beam-forming
• ISSN: 0890-5487; 2191-8945
• DOI: 10.1007/s13344-016-0066-y

To the problem of the unknown underwater target detection, according to the feature that the underwater target radiated noise contains the stable line spectrum, a weighted method based on the main-to-side lobe ratio （MSLR） is proposed for broadband beam-forming. This weighted method can be implemented by using the following steps. Firstly, optimize the spatial spectrum of each frequency unit by the second-order cone programming （SOCP）, and obtain the optimized spatial spectrum with lower side lobe. Secondly, construct weighting factors based on the MSLR of the optimized spatial spectrums to from weight factors. Lastly, cumulate the spatial spectrum of each frequency unit via the weight statistical method of this paper. This method can restrain the disturbance of background noise, enhance the output signal-to-noise ratio （SNR）, and overcome the difficulty of traditional four-dimensional display. The theoretical analysis and simulation results both verify that this method can well enhance the spatial spectrum of line spectrum units, restrain the spatial spectrum of background noise units, and improve the performance of the broadband beam-forming.