Page 32 - 《应用声学》2020年第4期

第 39 卷 第 4 期 Vol. 39, No. 4
2020 年 7 月 Journal of Applied Acoustics July, 2020

⋄ 研究报告 ⋄

基于模式能量比的海底声衰减系数反演

刘 婷 1,2,3† 曾 娟 1,2 刘 彪 1,2,3

(1 中国科学院水声环境特性重点实验室 北京 100190)
(2 中国科学院声学研究所 北京 100190)
(3 中国科学院大学 北京 100049)

摘要：简正波的分离性能对简正波频散曲线、模式能量比等物理量的提取至关重要，这些物理量可以用来反演
海底地声参数。该文分析了短时傅里叶变换和 warping 变换两种方法在简正波分离上的性能差异，并利用该
两种方法提取模式能量比来反演海底声衰减系数。仿真实验和 2018 年冬季黄海验数据处理表明，warping 变
换在简正波分离上具有较大的优势，尤其是在近距离接收上。
关键词：短时傅里叶变换；warping 变换；模式能量比；海底声衰减反演
中图法分类号: P733.21+6 文献标识码: A 文章编号: 1000-310X(2020)04-0518-09
DOI: 10.11684/j.issn.1000-310X.2020.04.004

Inversion of seabed attenuation based on modal ratios

LIU Ting 1,2,3 ZENG Juan 1,2 LIU Biao 1,2,3

(1 Key Laboratory of Underwater Acoustic Environment, Beijing 100190, China)
(2 Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China)
(3 University of Chinese Academy of Sciences, Beijing 100049, China)

Abstract: Modal resolution is critical to the extraction of the dispersion curves and modal ratios which are
often used in the inversion of the seabed geoacoustics parameters. In this paper, two ways of modal resolution-
short time Fourier transform (STFT) and warping transform are compared in separating modes, and then the
extraction of modal ratios, which are used in the inversion of the seabed attenuation. These two methods
are applied to the simulated data and experimental data collected in the Yellow sea of China during in the
winter of 2018. The results show that the warping technique has advantage over the STFT in modal resolution,
especially in the close receiving range.
Keywords: Short time Fourier transform; warping transform; Modal ratio; Inversion of seabed attenuation

2019-11-27 收稿; 2020-03-31 定稿
作者简介: 刘婷 (1994– ), 女, 河北保定人, 硕士研究生, 研究方向: 信号与信息处理。
† 通信作者 E-mail: liuting17@mails.ucas.ac.cn