利用简正模态相位关系的浅海声源深度分辨方法  

The discrimination of source depth regions in shallow water based on mode phase relation

作　　者：曹怀刚 赵振东 郭圣明[1] 马力[1,2] CAO Huaigang;ZHAO Zhendong;GUO Shengming;MA Li(Key Laboratory of Underwater Acoustic Environment,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190;Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 10004)

机构地区：[1]中国科学院声学研究所水声环境特性重点实验室,北京100190 [2]中国科学院声学研究所,北京100190 [3]中国科学院大学,北京100049

出　　处：《声学学报》2020年第6期801-810,共10页Acta Acustica

基　　金：国家自然科学基金项目(11804363)资助。

摘　　要：针对浅海波导声源深度分辨问题,本文提出了一种利用简正波的相位关系进行声源深度分辨的方法。该方法通过对垂直阵接收到的信号进行简正波分解,得到简正波系数,在已知声源距离的情况下通过对简正波系数项的处理得到各阶简正波的相位关系,根据相位关系估计声源的深度区间。该方法在阵元数较少时依然可以分辨声源深度,而且对宽带信号、窄带信号、连续信号和脉冲信号均适用。理论分析和数值仿真的结果说明:只有近水面处声源激发的简正波满足相位一致的特性,利用此特性可分辨水面水下目标。仿真和海试结果证明:在海水声速随深度不变或缓变的水文环境下,该方法可以准确的分辨声源深度区间,并且在深度采样不充分的情况下仍然适用。In order to solve the problem of source depth discrimination in shallow water waveguide,a method using phase relation is proposed.In this method,the signal received from a Vertical Line Array(VLA)is used to get normal mode coefficients by mode filtering processing.In the precondition that the source distance is known,the phase relation can be obtained from the adjacent normal mode coefficients,and the depth region is discriminated based on phase relation.This method can discriminate the source depth when the number of array elements is less.It is suitable for broadband signal,narrowband signal,continuous signal and pulse signal.The analysis and the results of numerical simulation show that only the surface source can excite normal modes which are in-phase.This peculiarity can be used for surface and submerged sources discrimination.Simulation and experimental results show that this method can discriminate source depth accurately with constant or slowly varying sound speed profile.And even the depth sampling is insufficient or the mode filtering result is not ideal,it can still work.

关 键 词：窄带信号 宽带信号 脉冲信号 相位关系 阵元数 简正波 相位一致 水文环境 

分 类 号：P733.2[天文地球—物理海洋学]