利用阵不变量的浅海宽带声源距离深度估计方法  

A broadband source range and depth estimation method using the array invariant

作　　者：周玉媛 孙超[1,2,3] 谢磊 ZHOU Yuyuan;SUN Chao;XIE Lei(School of Marine Science and Technology,Northwestern Polytechnical University,Xi’an 710072;Key Laboratory of Ocean Acoustic and Sensing,Ministry of Industry and Information Technology,Northwestern Polytechnical University,Xi’an 710072;Qingdao Research Institute,Northwestern Polytechnical University,Qingdao 266200)

机构地区：[1]西北工业大学航海学院,西安710072 [2]陕西省水下信息技术重点实验室,西安710072 [3]西北工业大学青岛研究院,青岛266200

出　　处：《声学学报》2023年第4期668-678,共11页Acta Acustica

基　　金：国家自然科学基金项目(11904342,12274348,11534009)资助。

摘　　要：现有阵不变量方法未能确定声源深度,且通常对远距离声源的测距误差较大。针对这一问题,提出一种利用阵不变量的宽带声源距离深度估计方法。该方法先对宽带接收信号进行频域波束形成和傅里叶逆变换,转换到波束-时间域以实现模态分离,波束-时间域各峰值位置的连线形成波束时间迁移曲线,曲线形状由阵不变量参数决定且与声源距离相关,曲线上能量分布由各阶模态激励决定且与声源深度有关;再沿波束时间迁移曲线提取波束时间强度并进行匹配处理,最终实现声源距离深度估计。SWellEx-96实验数据处理结果表明,本文所提方法的声源距离和深度估计平均相对误差分别为3.9%和3.4%,而常规阵不变量方法的平均相对测距误差为5.1%,验证了所提方法的优越性能。The existing array invariant methods fail to estimate source-depth and have large range estimation error for the longsource.To solve this problem,a broadband source range and depth estimation method using the array invariant is proposed in this paper.The proposed method firstly converts the wideband received signal into the beam-time domain for mode separation by frequency domain beamforming and Fourier inversion,and then multiple peak positions in the beam-time domain are connected to form the beam-time migration curve.The shape of the curve is determined by the array invariant and is related to the source-range.The energy distribution on the curve is determined by modes excitation factors and is related to the source depth.Then,the proposed method extracts the beam time intensity along the beam-time migration curve,and realizes the source range and depth estimation by matching the beam time intensity.SWellEx-96 experimental data processing results show that the mean relative errors of range and depth estimation in the proposed method are 3.9% and 3.4% respectively,while the mean relative error of range estimation in the conventional array invariant method is 5.1%,which verifies the superior performance of the proposed method.

关 键 词：浅海波导 阵不变量 宽带声源 距离深度估计 

分 类 号：TB56[交通运输工程—水声工程]