Method for the distinguish of normal modes in shallow water under near field  

作　　者：ZHU Hanhao XIAO Rui ZHU Jun ZHENG Guangxue TANG Jun TANG Yunfeng 

机构地区：[1]Institute of Marine Science and Technology,Zhejiang Ocean University,Zhoushan 316022 [2]State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190 [3]Institute of Naval Architecture and Mechanical-electrical Engineering,Zhejiang Ocean University,Zhoushan 316022 [4]Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province,Zhejiang University,Zhoushan 316021 [5]College of Underwater Acoustic Engineering,Harbin Engineering University,Harbin 150001

出　　处：《Chinese Journal of Acoustics》2020年第3期300-314,共15页声学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(11704337);National Defense Basic Research Program(JCKYS2020604SSJS011);State Key Laboratory of Acoustics,Chinese Academy of Sciences(SKLA201907);Key Laboratory of Ocean Observation-Imaging Tested of Zhejiang Province(00IT20180F05)。

摘　　要：This paper proposes a method to distinguish the normal modes in shallow water under near field.The method,which is based on frequency-wavenumber(F-K)transform,employs the 2D matrix comprising near field horizontal multi-channel signals.These signals are transformed from the time-space domain to the frequency-wavenumber domain,and the normal modes in the signals are distinguished by extracting the wavenumbers component at each frequency for each order in the frequency-wavenumber domain.The practical reliability and validity of this method are verified by performing numerical simulation and a tank experiment,and the results showed that the normal modes in the Pekeris waveguide below 200 Hz could be obtained reliably at 500 m by using this method.

关 键 词：WAVEGUIDE SHALLOW NORMAL 

分 类 号：TN911.7[电子电信—通信与信息系统]