浅海低频集约参数混响强度模型  

Low-frequency integrated-parameters reverberation intensity model in shallow water waveguide

作　　者：李鹏[1,2] 侯倩男 吴金荣[1] 郭圣明[1] 马力[1] LI Peng;HOU Qiannan;WU Jinrong;GUO Shengming;MA Li(Key Laboratory of Underwater Acoustic Environment,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院声学研究所中国科学院水声环境特性重点实验室,北京100190 [2]中国科学院大学,北京100190

出　　处：《哈尔滨工程大学学报》2020年第10期1513-1517,共5页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(11774375,11974375,11904383).

摘　　要：为了克服传统混响模型中参数多、难以测量及参数间耦合严重的问题,本文提出利用少数信息集中、受基本物理现象约束的集约参数描述的混响强度模型。通过海底反射相位参数P、海底反射损失参数Q描述全波动混响模型中简正波本征函数和本征值,利用近似常数μ描述小尺度条件下、剔除角度分布项的海底反向散射能力,获得了集约参数混响强度模型。考虑实际测量数据情况,采用海洋环境噪声强度对混响模型进行了修正。结果表明:参数P对混响强度影响相对较小,主要通过控制海底散射角度特性间接影响混响强度;参数Q主要影响混响强度的衰减快慢;参数μ主要控制混响强度总体的强弱;该模型主要适用于浅海低频高混响-噪声比的情况,当混响-噪声比较小时,需要利用海洋环境噪声强度对混响强度模型进行修正。There are many unknown ocean environmental parameters in traditional reverberation models.The parameters are not easy to measure and they are subject to severe coupling.In this paper,integrated parameters are used to model low-frequency reverberation in a shallow water waveguide.The integrated parameters include the sea-floor low-grazing-angle reflection parameters P and Q restricted by the sea-floor reflection coefficient and the sea-floor scattering parameterμrestricted by bottom Rayleigh scattering.To analyze the obtained ocean reverberation data,the proposed reverberation model was corrected for the ambient noise intensity.Numerical simulation results show that the parameter P has little effect on reverberation intensity,parameter Q can determine the decay rate of the re verberation intensity,and parameterμhas a direct effect on the reverberation intensity at all ranges.The new model is fit for use in cases with a high reverberation-ambient noise ratio.In cases with a low reverberation-ambient noise ratio,the proposed reverberation intensity model should be corrected for the background ambient noise intensity.

关 键 词：集约参数 混响强度 反向散射 反射相位 反射损失 海洋环境噪声 混响-噪声比 浅海 

分 类 号：O427[理学—声学]