An FDTD Near-to Far-Zone Transformation for Scattering from Object over the Curved Earth

李清亮; 葛德彪

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An FDTD Near-to Far-Zone Transformation for Scattering from Object over the Curved Earth

更新时间：2025-12-08

- An FDTD Near-to Far-Zone Transformation for Scattering from Object over the Curved Earth
- Acta Electronica Sinica Issue 3, Pages: 37-39(1999)
- 作者机构：
  
  1. 西安电子科技大学物理系!西安
  2. 710071
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN95
- Published：1999
- 稿件说明：
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[1]李清亮,葛德彪.球形地面上目标散射FDTD近-远场外推[J].电子学报,1999(03):37-39.

李清亮, 葛德彪. An FDTD Near-to Far-Zone Transformation for Scattering from Object over the Curved Earth[J]. Acta Electronica Sinica, 1999, (3): 37-39.
[1]李清亮,葛德彪.球形地面上目标散射FDTD近-远场外推[J].电子学报,1999(03):37-39. DOI：

李清亮, 葛德彪. An FDTD Near-to Far-Zone Transformation for Scattering from Object over the Curved Earth[J]. Acta Electronica Sinica, 1999, (3): 37-39. DOI：

摘要

由光滑球形地面上垂直电偶极子产生地波场的求解公式及互易原理，本文导出了采用F～方法处理视距外海上复杂目标散射问题时的近一远场外推公式．在数值结果验证了该公式的正确性之后，对海面上一金属半球的散射场进行了求解，并以此与工程应用中的近似方法相对比，考察了工程应用方法的近似程度.

Abstract

A scheme of FDTD near-to far-zone transformation for scattering from an object over the curved earth is presented in this paper. With the equivalence principle

the eqUivalent electric and magnetic currents can be obtained from FDTD near fields output boundaries. The fields radiated by these currents in the presence of curved earth are then calculated using the reciprocity theorem and the known ground wave propagation formula of a vertical electric dipole （S. Rotheram

1992）. Numerical results show excellent agreement between this scheme and analytical results. The feasibility of another approximate approach （Q. L. Li et al

1997）is also tested by this scheme.

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