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Volume 28 Issue 4
 
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Article Navigation >  Journal of Unmanned Undersea Systems  > 2020  >  28(4): 403-409
JIN Xiong, JIANG Run-xiang, CHENG Jin-fang, CHEN Xin-gang. A Depth Conversion Method of Shaft-Rate Electric Field Based on Envelope Signal[J]. Journal of Unmanned Undersea Systems, 2020, 28(4): 403-409. doi: 10.11993/j.issn.2096-3920.2020.04.008
Citation: JIN Xiong, JIANG Run-xiang, CHENG Jin-fang, CHEN Xin-gang. A Depth Conversion Method of Shaft-Rate Electric Field Based on Envelope Signal[J]. Journal of Unmanned Undersea Systems, 2020, 28(4): 403-409. doi: 10.11993/j.issn.2096-3920.2020.04.008
shu

A Depth Conversion Method of Shaft-Rate Electric Field Based on Envelope Signal

doi: 10.11993/j.issn.2096-3920.2020.04.008
  • 1.

    Department of Weaponry Engineering, Naval University of Engineering, Wuhan 430033, China

  • 2.

    College of Electrical Engineering, Naval University of Engineering, Wuhan 430033, China

  • 3.

    92942th Unit, The Peoples Liberation Army of China, Beijing 100161, China

  • Received Date: 2019-10-04
  • Rev Recd Date: 2019-12-09
  • Publish Date: 2020-08-31
    Abstract
  • Only application of the horizontal time-harmonic dipole to the conversion of the shaft-rate electric field signal of ship will result in large near-field depth error. In this study, the variation laws of the current density in different position of hull surface and the shaft-ground resistance are clarified on the basis of simulation data. A depth conversion method of shaft-rate electric field is proposed based on its envelope signal. In this method, the depth conversion problem in the near field of the shaft-rate electric field signal envelope is transformed into the near-field conversion problem of equivalent static electric field after the calculation of the shaft-rate electric field signal envelope via Hilbert transform, and the point charge model is used to establish a forward and inversion model of the shaft-rate electric field signal envelope in the ‘air-sea-seabed’ three-layer media condition. The effectiveness of the proposed method is verified by four kinds of cathodic corrosion protection test data of the ship model. The results show that the proposed method can accurately calculate the shaft-rate electric field signal envelope. Taking root square error as evaluation criteria, the conversion error is less than 15% in the depth equaling the ship model width

     

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