张磊,
陆金文,
邢笑宇,
李胜,
殷红成
电磁散射重点实验室 北京 100854
基金项目:国家重点研发计划(2018YFC0825804)
详细信息
作者简介:闫华：闫 华(1981–)，男，博士，电磁散射重点实验室高级工程师，研究方向为雷达目标散射特性、计算电磁学、特征提取、参数化建模等
张磊：张 磊(1991–)，男，博士，电磁散射重点实验室工程师，主要研究方向为雷达目标散射特性、散射中心参数化建模、SAR目标识别等
陆金文(1994–)，男，电磁散射重点实验室博士研究生，主要研究方向为雷达目标散射特性、电磁散射参数化建模等
李胜：李 胜(1980–)，男，硕士，电磁散射重点实验室高级工程师，主要研究方向为雷达目标特征控制、特征提取等
殷红成(1967–)，男，博士，电磁散射重点实验室研究员，研究方向为雷达目标特性、计算电磁学、目标识别等
通讯作者:闫华 yanhuabit@126.com
责任主编：朱国强 Corresponding Editor: ZHU Guoqiang中图分类号:TN95
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出版历程
收稿日期:2021-01-11
修回日期:2021-03-01
网络出版日期:2021-03-23
刊出日期:2021-06-28
Frequency-dependent Factor Expression of the GTD Scattering Center Model for the Arbitrary Multiple Scattering Mechanism
YAN Hua,,ZHANG Lei,
LU Jinwen,
XING Xiaoyu,
LI Sheng,
YIN Hongcheng
Science and Technology on Electromagnetic Scattering Laboratory, Beijing 100854, China
Funds:The National Key Research and Development Program of China (2018YFC0825804)
More Information
Corresponding author:YAN Hua, yanhuabit@126.com
摘要
摘要:几何绕射理论(GTD)模型是一种重要的散射中心模型，能准确描述雷达目标主要散射机理的频率依赖行为，但目前在频率依赖因子与散射机理类型之间尚未建立明确、一般的数学关系。该文从射线理论出发，结合几何光学(GO), GTD, 物理绕射理论(PTD)和驻相法(SPM)等方法，推导了理想电导体(PEC)目标任意多次散射机理的频率依赖因子数学表达式。该表达式具有简洁、统一的解析形式，指出散射中心频率依赖因子与形成散射中心的射线反射次数、射线经过的几何元素维数以及射线场焦散情况等因素有关。一系列典型组合体目标的电磁仿真与微波暗室测量数据验证了提出公式的有效性。该文提出的频率依赖因子表达可应用于正向参数化建模中频率依赖因子的正向推算。
关键词:散射中心模型/
多次散射机理/
GTD模型/
频率依赖因子
Abstract:This paper presents a derivation of a formula with a concise and uniform analytic form by the Stationary Phase Method (SPM) plus Geometrical Optics (GO), the Physical Theory of Diffraction (PTD), and Geometrical Theory of Diffraction (GTD) to calculate the frequency-dependent factor for the arbitrary multiple scattering mechanism, validated by the simulated and measured data of a series of canonical ensembles, validated by the simulated and measured data of a series of canonical ensembles. Although the GTD model, a scattering center model, can accurately describe the frequency-dependent characteristic of several main scattering mechanisms of the radar target, no explicit and general expression relates the frequency-dependent factor to the type of scattering mechanism. The derived formula relates the scattering center’s frequency-dependent factor with bounce times, dimensions of all the encountered geometrical elements, and a caustic type of ray contributing to the scattering center and can be applied to determine the parameter value of frequency-dependent factor of the GTD model and its derived versions in the forward parametric modeling.
Key words:Scattering center model/
Multiple scattering mechanism/
GTD model/
Frequency-dependent factor
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