An efficient hybrid method based on the method of moments （MOM） and physical optics （PO） for the analysis of radiation characteristics of an electrically large antenna-radome system is presented. Specifically, MOM...An efficient hybrid method based on the method of moments （MOM） and physical optics （PO） for the analysis of radiation characteristics of an electrically large antenna-radome system is presented. Specifically, MOM is first applied to the antenna to find the current on its surface, and then the equivalent PO currents produced by the antenna radiation are assumed on the radome wall. When the coupling of the PO currents and antenna current is considered, the coupling matrix is divided into a series of partial matrices, in order to deduce the memory requirement and accelerate the evaluation process. Numerical results indicate that the proposed hybrid PO-MOM method is accurate and efficient.展开更多
电大尺寸和复杂目标电磁散射特性快速精准计算分析方法是提升目标特征信息提取能力的重要手段。车辆目标的散射场主要源于反射和绕射的综合作用,因此采用物理绕射理论(physical theory of diffraction,PTD)引入棱边绕射效应,改进物理光...电大尺寸和复杂目标电磁散射特性快速精准计算分析方法是提升目标特征信息提取能力的重要手段。车辆目标的散射场主要源于反射和绕射的综合作用,因此采用物理绕射理论(physical theory of diffraction,PTD)引入棱边绕射效应,改进物理光学(physical optics,PO)方法,从而建立电大尺寸和复杂目标电磁散射模型的PO-PTD混合型高频近似优化计算方法,以提升目标特征信息提取能力。进而,基于PO-PTD优化方法分析电大尺寸厢式车辆目标的电磁散射问题,研究其雷达散射截面积(radar cross section,RCS)周向分布特征对频率与擦地角的响应特性。车辆各方位的电磁散射特性与其对应的结构形状有密切关系,涉及大平面镜面反射、二面角反射、边缘绕射等多重效应。车辆RCS分布曲线形态随着擦地角增大而呈现先扩张后缩减的变化,并随着频率增大呈现缩减态势。车辆前向车头与后向车尾对擦地角变化最为敏感,是影响RCS曲线形态变化的主导因素。本研究可为电大尺寸和复杂目标电磁散射特性评估与控制技术提供关键的技术基础。展开更多
基金the National Natural Science Foundation of China (60471040)
文摘An efficient hybrid method based on the method of moments （MOM） and physical optics （PO） for the analysis of radiation characteristics of an electrically large antenna-radome system is presented. Specifically, MOM is first applied to the antenna to find the current on its surface, and then the equivalent PO currents produced by the antenna radiation are assumed on the radome wall. When the coupling of the PO currents and antenna current is considered, the coupling matrix is divided into a series of partial matrices, in order to deduce the memory requirement and accelerate the evaluation process. Numerical results indicate that the proposed hybrid PO-MOM method is accurate and efficient.
文摘电大尺寸和复杂目标电磁散射特性快速精准计算分析方法是提升目标特征信息提取能力的重要手段。车辆目标的散射场主要源于反射和绕射的综合作用,因此采用物理绕射理论(physical theory of diffraction,PTD)引入棱边绕射效应,改进物理光学(physical optics,PO)方法,从而建立电大尺寸和复杂目标电磁散射模型的PO-PTD混合型高频近似优化计算方法,以提升目标特征信息提取能力。进而,基于PO-PTD优化方法分析电大尺寸厢式车辆目标的电磁散射问题,研究其雷达散射截面积(radar cross section,RCS)周向分布特征对频率与擦地角的响应特性。车辆各方位的电磁散射特性与其对应的结构形状有密切关系,涉及大平面镜面反射、二面角反射、边缘绕射等多重效应。车辆RCS分布曲线形态随着擦地角增大而呈现先扩张后缩减的变化,并随着频率增大呈现缩减态势。车辆前向车头与后向车尾对擦地角变化最为敏感,是影响RCS曲线形态变化的主导因素。本研究可为电大尺寸和复杂目标电磁散射特性评估与控制技术提供关键的技术基础。
