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ZHU Hanhao, ZHU Jun, ZHENG Guangxue, TANG Jun, ZHENG Hong, TANG Yunfeng. A seperation method for normal modes in shallow water under near field[J]. ACTA ACUSTICA, 2019, 44(1): 39-48. DOI: 10.15949/j.cnki.0371-0025.2019.01.005
Citation: ZHU Hanhao, ZHU Jun, ZHENG Guangxue, TANG Jun, ZHENG Hong, TANG Yunfeng. A seperation method for normal modes in shallow water under near field[J]. ACTA ACUSTICA, 2019, 44(1): 39-48. DOI: 10.15949/j.cnki.0371-0025.2019.01.005

A seperation method for normal modes in shallow water under near field

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  • PACS: 
  • Received Date: December 22, 2017
  • Revised Date: July 31, 2018
  • Available Online: June 27, 2022
  • To separate the normal modes in shallow water under near field, a separation method based on frequencywavenumber(F-K) transform is proposed in this paper. Based on F-K transformation, the 2D receipt a-coustic signal matrix, which composed by near field horizontal multi-channel signals,is processed from time-space domain to frequency-wavenumber domain, the normal modes in signals is separated by extracting the wavenumbers at each frequency for each order in the frequeny-wavenumber domain. The reliability and validity of this method in practice are verified by numerical simulation and tank experiment, which showed that the normal modes in Pekeris waveguide under 200 Hz could be obtained reliably within 500 m through this method.
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