基于PE-PO混合方法的海洋大气波导环境下电大目标电磁散射研究  

Study on electromagnetic scattering of electrically large targets in ocean atmosphere duct environment based on PE-PO hybrid method

作　　者：余洪鑫 冯菊[1] 欧阳琪翔 廖成[1] YU Hongxin;FENG Ju;OUYANG Qixiang;LIAO Cheng(Institute of Electromagnetics,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学电磁场与微波技术研究所,成都610031

出　　处：《电波科学学报》2025年第1期29-36,共8页Chinese Journal of Radio Science

基　　金：国家自然科学基金(62271416)。

摘　　要：针对海洋大气波导环境下电大尺寸目标电磁散射特性预测难题,提出了一种结合三维抛物方程(parabolic equation,PE)法和物理光学(physical optics,PO)法的混合计算方法。在该方法中,PE法被用于求解电磁波在背景环境中的传播,PO法被用于计算目标对雷达波的散射,同时平面波谱分解技术被引入以实现两种算法的有效衔接。为验证该方法的正确性和有效性,对平坦地面上金属球目标的散射进行了模拟,并将结果与多层快速多极子算法(multilevel fast multipole algorithm,MLFMA)和PO法的计算结果进行了对比。然后将该方法应用于不同高度蒸发波导环境下舰船目标的电磁散射预测。结果表明,所提出的PE-PO方法能够有效考虑大气波导对照射激励和目标散射过程的影响,为剖析和理解大气波导环境下电大尺寸目标的电磁散射特性提供了一种新的技术途径。To address the challenge of predicting electromagnetic scattering characteristics of electrically large targets in a maritime atmospheric duct environment,this paper proposes a hybrid computational method combining the three-dimensional parabolic equation method(PE)and the physical optics method(PO).In this approach,the PE is employed to solve the propagation of electromagnetic waves in the background environment,while the PO is used to calculate the scattering of radar waves by the target.Additionally,a plane wave spectrum decomposition technique is introduced to facilitate the efficient integration of the two algorithms.The proposed method is validated through scattering simulation experiments involving a metallic sphere over a flat surface,where it is compared with results from the multilevel fast multipole algorithm(MLFMA)and the PO method.Finally,the proposed method is applied to predict the electromagnetic scattering of a ship target under evaporation ducts of varying heights.The results demonstrate that the proposed PE-PO method effectively accounts for the influence of atmospheric ducts on both the incident wavefront and the target scattering process,providing a novel technical approach for analyzing and understanding the electromagnetic scattering characteristics of electrically large targets in ducting environments.

关 键 词：电磁散射 大气波导 抛物方程(PE)法 物理光学(PO)法 混合方法 

分 类 号：TN011[电子电信—物理电子学]