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.
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)。
