虚拟源阵估计浅海目标噪声源强度  

Virtual source array for estimating the intensity of target noise source in shallow water

作　　者：孙军平 林建恒 衣雪娟[1] 江鹏飞 李娜 蒋国健 SUN Junping;LIN Jianheng;YI Xuejuan;JIANG Pengfei;LI Na;JIANG Guojian(Qingdao Branch,Institute of Acoustics,Chinese Academy of Sciences,Qingdao 266109;Key Laboratory of Underwater Acoustic Environment,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190)

机构地区：[1]中国科学院声学研究所北海研究站,青岛266109 [2]中国科学院水声环境特性重点实验室(声学研究所),北京100190

出　　处：《声学学报》2023年第4期724-732,共9页Acta Acustica

基　　金：国防基础科研项目(JCKY2021207CH06);中国科学院声学研究所自主部署“目标导向”类项目(MBDX202102)资助。

摘　　要：针对浅海目标噪声源强度测量估计受波导影响产生偏离的问题,提出一种虚拟垂直源阵浅海目标噪声源强度估计方法,通过被测目标噪声源在浅海波导中移动形成虚拟垂直源阵,利用简正波特征函数的正交性,消除浅海目标噪声场的干涉,以及声源和接收点深度对声源强度测量的影响,获取了更为接近自由场测量的目标噪声源强度估计。理论分析和数值仿真表明,浅海波导中采用本方法测量估计得到的目标噪声源自由场强度和预设真实值相近,同一噪声源在不同浅海波导测量估计结果相同。仿真结果证实了方法的可行性,并显示:南海某实际波导中,100 Hz以上频段目标噪声源强度估计和真实值相差小于0.5 dB,40 Hz至100 Hz频段,相差小于1.0 dB,20 Hz误差约为3.0 dB;30 Hz以上频段,同一源4种波导环境中测量估计值的标准差小于0.5 dB。文中还就所提方法的主要误差来源以及导致低频段误差增大的原因进行了理论分析和仿真。文中所提虚拟源阵方法,为提高水中目标噪声源强度的测量估计精度提供了一种思路,并可为波导参数的准确反演估计提供参考。The measurement and estimation of source intensity of underwater target noise in shallow water significantly deviate from the value measured in the free field.Aimed at the problem,a method of virtual source array is proposed.Based on the move vertically in the waveguide of the tested target to form a virtual source array,the influences of noise field interference and the depths of the sound source and receiving points on the intensity estimation are eliminated according to the orthogonality of the eigenfunctions,and the estimation intensity closer to the free field measurement is obtained.Theoretical and numerical simulation results show that,the target noise source intensity estimated by this method in shallow water waveguide is close to the preset true value,and has the same results in different shallow water waveguides.The numerical simulations confirm the feasibility of the method and show that,the errors of the estimation intensity in a practical waveguide from the South China Sea in the frequency band above 100 Hz are less than 0.5 dB,less than 1.0 dB in the frequency band between 40 Hz and 100 Hz,and about 3.0 dB at 20 Hz.The standard deviations of noise source intensity estimated in four different waveguide environments are less than 0.5 dB above30 Hz.The main error sources and the reasons for the larger errors at low frequencies are also analyzed and simulated.The virtual source array method proposed can provide an idea to improve the measurement and estimation accuracy of underwater target noise source intensity,and also a reference for the accurate inversion and estimation of waveguide parameters.

关 键 词：浅海波导 目标噪声源 虚拟源阵 强度估计方法 

分 类 号：P733.22[天文地球—物理海洋学] P714[天文地球—海洋科学]