哈尔滨工程大学学报2026，Vol.47Issue(5)：1052-1060,9.DOI:10.11990/jheu.202506060
南海深海近海底噪声场垂直空间特性试验研究
Experimental study on the vertical spatial characteristics of deep-sea near-bottom ambient noise in the South China Sea
摘要
Abstract
The vertical spatial characteristics of the ocean ambient noise field in the South China Sea have not yet been clearly clarified,posing challenges for providing accurate guidance for sonar array design,signal processing algorithm optimization,and system performance evaluation.Based on summer near-bottom noise data from a vertical array in the South China Sea,the vertical spatial characteristics of the ocean ambient noise field are analyzed,with key conclusions regarding noise spectrum level,vertical correlation,and directivity as follows:Regarding the noise spectrum level,the 1 000 Hz,1 500 Hz,and 2 000 Hz frequency bands follow a normal distribution,while the 500 Hz band exhibits a chi-square distribution due to external interference;in terms of the vertical correlation of the noise field,the first zero value of the correlation coefficient ranges from 0.4 to 0.75 wavelengths,and when the frequency is less than 1 800 Hz,this zero value exceeds 0.5 wavelengths.Therefore,for a uniform linear array arranged with half-wavelength spacing,the conventional processing gain is lower than the Rayleigh limit under this background noise field;with respect to vertical directivity,the vertical dimension anisotropy affects the processing gain of the vertical array at different depression angles,and a directional trough exists within±15° in the horizontal direction.This is attributed to the fact that noise sources from the sea surface cannot reach the near-bottom receivers at small angles.These results can provide theoretical guidance for the design of sonar arrays and the optimization of signal processing adapted to the deep-sea environment.关键词
环境噪声/空间相关系数/噪声场垂直相关性/噪声场垂直指向性/瑞利限/垂直阵/指向性凹槽Key words
ambient noise/spatial correlation coefficient/vertical correlation of the noise field/vertical directivity of the noise field/Rayleigh limit/vertical line array/directional trough分类
海洋科学引用本文复制引用
张帅帅,郑广赢,任超,丁新宇,姜彦宇..南海深海近海底噪声场垂直空间特性试验研究[J].哈尔滨工程大学学报,2026,47(5):1052-1060,9.基金项目
国家自然科学基金项目(12304501). （12304501）
