中国物理B ›› 2010, Vol. 19 ›› Issue (4): 44102-044102.doi: 10.1088/1674-1056/19/4/044102

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Application of the method of equivalent edge currents to composite scattering from the cone-cylinder above a dielectric rough sea surface

郭立新, 王蕊, 吴振森   

  1. School of Science, Xidian University, Xi'an 710071, China
  • 收稿日期:2009-08-12 修回日期:2009-08-27 出版日期:2010-04-15 发布日期:2010-04-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No.~60971067) and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No.~20070701010).

Application of the method of equivalent edge currents to composite scattering from the cone-cylinder above a dielectric rough sea surface

Guo Li-Xin(郭立新)†, Wang Rui(王蕊), and Wu Zhen-Sen(吴振森)   

  1. School of Science, Xidian University, Xi'an 710071, China
  • Received:2009-08-12 Revised:2009-08-27 Online:2010-04-15 Published:2010-04-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No.~60971067) and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No.~20070701010).

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摘要： Compared with scattering from a rough surface only, composite scattering from a target above a rough surface has become so practical that it is a subject of great interest. At present, this problem has been solved by some numerical methods which will produce an enormous calculation amount. In order to overcome this shortcoming, the reciprocity theorem (RT) and the method of equivalent edge currents (MEC) are used in this paper. Due to the advantage of RT, the difficulty in computing the secondary scattered fields is reduced. Simultaneously, MEC, a high-frequency method with edge diffraction considered, is used to calculate the scattered field from the cone-cylinder target with a high accuracy and efficiency. The backscattered field and the polarization currents of the rough sea surface are evaluated by the Kirchhoff approximation (KA) method and physical optics (PO) method, respectively. The effects of the backscattering radar cross section (RCS) and the Doppler spectrum on the size of the target and the windspeed of the sea surface for different incident angles are analysed in detail.

Abstract: Compared with scattering from a rough surface only, composite scattering from a target above a rough surface has become so practical that it is a subject of great interest. At present, this problem has been solved by some numerical methods which will produce an enormous calculation amount. In order to overcome this shortcoming, the reciprocity theorem (RT) and the method of equivalent edge currents (MEC) are used in this paper. Due to the advantage of RT, the difficulty in computing the secondary scattered fields is reduced. Simultaneously, MEC, a high-frequency method with edge diffraction considered, is used to calculate the scattered field from the cone-cylinder target with a high accuracy and efficiency. The backscattered field and the polarization currents of the rough sea surface are evaluated by the Kirchhoff approximation (KA) method and physical optics (PO) method, respectively. The effects of the backscattering radar cross section (RCS) and the Doppler spectrum on the size of the target and the windspeed of the sea surface for different incident angles are analysed in detail.

Key words: method of equivalent edge currents, reciprocity theorem, cone-cylinder, rough sea surface, electromagnetic scattering

中图分类号:  (Instruments and techniques for geophysical research: Exploration geophysics)

  • 93.85.-q
92.10.Fj (Upper ocean and mixed layer processes) 91.50.Iv (Marine magnetics and electromagnetics) 92.60.Gn (Winds and their effects) 42.68.Xy (Ocean optics)