中国物理B ›› 2009, Vol. 18 ›› Issue (7): 2757-2763.doi: 10.1088/1674-1056/18/7/022

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Investigation of composite electromagnetic scattering from ship-like target on the randomly rough sea surface using FDTD method

李娟, 郭立新, 曾浩, 韩旭彪   

  1. School of Science, Xidian University, Xi'an 710071, China
  • 收稿日期:2008-12-25 修回日期:2009-02-03 出版日期:2009-07-20 发布日期:2009-07-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 60571058), the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant No 20070701010).

Investigation of composite electromagnetic scattering from ship-like target on the randomly rough sea surface using FDTD method

Li Juan(李娟)†, Guo Li-Xin(郭立新), Zeng Hao(曾浩), and Han Xu-Biao(韩旭彪)   

  1. School of Science, Xidian University, Xi'an 710071, China
  • Received:2008-12-25 Revised:2009-02-03 Online:2009-07-20 Published:2009-07-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 60571058), the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant No 20070701010).

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摘要： Composite electromagnetic scattering from a two-dimensional (2D) ship-like target on a one-dimensional sea surface is investigated by using the finite-difference time-domain (FDTD) method. A uniaxial perfectly matched layer is adopted for truncation of FDTD lattices. The FDTD updated equations can be used for the total computation domain by choosing the uniaxial parameters properly. To validate the proposed numerical technique, a 2D infinitely long cylinder over the sea surface is taken into account first. The variation of angular distribution of the scattering changing with incident angle is calculated. The results show good agreement with the conventional moment method. Finally, the influence of the incident angle, the polarization, and the size of the ship-like target on the composite scattering coefficient is discussed in detail.

Abstract: Composite electromagnetic scattering from a two-dimensional (2D) ship-like target on a one-dimensional sea surface is investigated by using the finite-difference time-domain (FDTD) method. A uniaxial perfectly matched layer is adopted for truncation of FDTD lattices. The FDTD updated equations can be used for the total computation domain by choosing the uniaxial parameters properly. To validate the proposed numerical technique, a 2D infinitely long cylinder over the sea surface is taken into account first. The variation of angular distribution of the scattering changing with incident angle is calculated. The results show good agreement with the conventional moment method. Finally, the influence of the incident angle, the polarization, and the size of the ship-like target on the composite scattering coefficient is discussed in detail.

Key words: finite-difference time-domain, uniaxial perfectly matched layer, sea surface, electromagnetic scattering

中图分类号:  (Electromagnetic wave propagation; radiowave propagation)

  • 41.20.Jb
02.70.Bf (Finite-difference methods) 92.10.Hm (Ocean waves and oscillations)