CHINESE JOURNAL OF COMPUTATIONAL PHYSICS ›› 2019, Vol. 36 ›› Issue (5): 569-576.DOI: 10.19596/j.cnki.1001-246x.7920

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Finite Difference Time Domain Method for Composite Electromagnetic Scattering from Soil Surface and Partly Buried Multiple Targets

REN Xincheng1, ZHU Xiaomin1, GUO Lixin2   

  1. 1. School of Physics and Electronic Information, Yanan University, Yan'an Shanxi 716000, China;
    2. School of Physics and Optoelectronic Engineering, Xidian University, Xi'an Shanxi 710071, China
  • Received:2018-07-05 Revised:2018-10-10 Online:2019-09-25 Published:2019-09-25

Abstract: Dobson semi-empirical model and dielectric complex permittivity are used to represent real and imaginary parts of soil dielectric constant. Soil surface is simulated with exponential distribution model and Monte Carlo method. Composite electromagnetic scattering from soil surface and partially buried multiple columns with rectangular cross-section is studied with finite difference time domain method. It shows that composite scattering coefficient oscillates with scattering angle. Root mean square of soil surface, soil moisture content, dielectric constant of target and incidence angle have great influence on composite scattering coefficient. Correlation length of soil surface, width, height, distance of target section, and dip angle have weak influence on composite scattering coefficient. Buried depth of target hardly has effect on composite scattering coefficient. Compared with other numerical methods, finite difference time domain method obtains higher accuracy, and reduces calculation time and amount of memory occupying as well. It can be used to calculate complex scattering from rough ground and sea surface with nearby arbitrary multiple targets.

Key words: finite difference time domain method, composite electromagnetic scattering, soil surface, multiple targets

CLC Number: