Reliable approach for bistatic scattering of three-dimensional targets from underlying rough surface based on parabolic equation

• 来源期刊: 中国物理B（英文版）
• 关键词: parabolic equation rough surface alternating direction implicit (ADI) difference normalized radar cross section
• 年，卷（期）: 2018,（7）
• 页码范围: 355-362
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/7/074102

摘要

A parabolic equation (PE) based method for analyzing composite scattering under an electromagnetic wave incidence at low grazing angle, which composes of three-dimensional (3-D) electrically large targets and rough surface, is presented and discussed. A superior high-order PE version is used to improve the accuracy at wider paraxial angles, and along with the alternating direction implicit (ADI) differential technique, the computational efficiency is further improved. The formula of bistatic normalized radar cross section is derived by definition and near-far field transformation. Numerical examples are given to show the validity and accuracy of the proposed approach, in which the results are compared with those of Kirchhoff approximation (KA) and moment of method (MoM). Furthermore, the bistatic scattering properties of composite model in which the 3-D PEC targets on or above the two-dimensional Gaussian rough surfaces under the tapered wave incidence are analyzed.