粗糙海底散射对浅海混响有规干涉结构的影响  

Effect of rough seabed scattering on reverberation regular interference structures in shallow water

作　　者：杨华 秦继兴[1,2] 左乙茹 庞杰 YANG Hua;QIN Jixing;ZUO Yiru;PANG Jie(State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100190,China;Unit 92578 of People’s Liberation Army of China,Beijing 100190,China;Faculty of Information Science and Engineering,Ocean University of China,Qingdao 266100,Shandong,China)

机构地区：[1]中国科学院声学研究所声场声信息国家重点实验室,北京100190 [2]中国科学院大学,北京100190 [3]中国人民解放军92578部队,北京100190 [4]中国海洋大学信息科学与工程学部,山东青岛266100

出　　处：《声学技术》2024年第6期761-771,共11页Technical Acoustics

基　　金：国家自然科学基金(12374427);中国科学院青年创新促进会(2021023)项目资助。

摘　　要：在浅海波导中,海底混响是构成混响的主要因素。由于波导效应,浅海海底混响在时间-频率域会出现稳定的有规干涉结构,但是该结构受海底散射影响严重,为准确提取有规干涉结构带来困难。文章通过条件生成对抗网络、仿真建模和实验验证,分析了不同海底声学参数与混响有规干涉结构的关系,讨论了粗糙海底散射对浅海混响有规干涉结构的影响。结果表明,海底底质参数如海底声速对混响波导不变量取值影响较大,海底界面参数会破坏混响有规干涉结构的观测及混响强度。在利用条件生成对抗网络恢复混响干涉条纹时发现,短时傅里叶变换时频参数的选取会影响混响干涉条纹的恢复效果。初步研究表明,信号确定的时频参数与相关粗糙海底参数相匹配时,干涉条纹的恢复效果较好。In the shallow ocean waveguide,seabed reverberation is the main factor contributing to reverberation.Due to the waveguide effect,seabed reverberation in the time-frequency domain can exhibit a stable and regular interference structure in shallow water.However,this interference structure is significantly affected by seabed scattering,which makes it difficult to accurately extract the regular interference structure of the reverberation.In this paper through conditional generation of adversarial networks,simulation modeling and experimental verification,the relationship between different seabed acoustic parameters and regular interference structures in reverberation is analyzed,and the effect of rough seabed scattering on these structures is discussed.The results show that seabed substrate parameters such as sound velocity have significant influence on the value of reverberation waveguide invariance,while the interface parameters can also affect not only the observation of regular interference structures,but the reverberations intensity as well.When interferometric fringes are recovered by using conditional generation adversarial networks,it is found that the selection of short-time Fourier transform time-frequency parameters can affect the recovery result.Preliminary studies show that the recovery result reaches well when the signal determined time-frequency parameters are matched with those of rough seabed.

关 键 词：混响有规干涉结构 粗糙海底散射 波导不变量 短时傅里叶变换 

分 类 号：O427.2[理学—声学]