| 摘要: |
| 为解决各向异性介质与金属复合目标电磁散射计算困难等问题，提出了一种高效的混合算法，用于模拟各向异性介质涂覆复杂目标的电磁散射。该方法基于阻抗边界条件，通过表面阻抗向量来描述介质的电磁特性，充分发挥了低频矩量法（Method of Moments,MoM）和高频物理光学法（Physical Optics,PO）的各自优势，以实现对介质金属复合目标进行高精度和快速的电磁仿真。通过采用阻抗边界条件（Impedance Boundary Conditions,IBC）和等效原理，研究将薄层介质涂覆目标的电磁散射问题等效为阻抗面上等效电磁流的辐射问题，从而实现了对各向异性介质涂覆复杂目标雷达截面（Radar Cross Section,RCS）的高精度快速计算。为了验证算法性能，选取了方形平板、简化飞行器及复杂卫星模型进行仿真测试。经过对比分析，所提算法的仿真结果与数值解之间的均方根误差分别为0.82 dB、1.56 dB和2.64 dB，均优于3 dB的工程应用标准误差。此外，该算法在计算消耗内存和计算时长等计算资源方面实现了超过50%的显著提升，充分验证了其准确性和实用价值。 |
| 关键词: 介质金属复合目标 电磁散射 各向异性 混合算法 |
| DOI：10.20079/j.issn.1001-893x.231008003 |
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| 基金项目: |
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| Efficient Modeling of EM Scattering from Dielectric-Metal Composite Targets |
| QIN Qina,b,ZHOU Fenga |
| (1a.Hubei Key Laboratory of Intelligent Vision Based Monitoring for Hydroelectric Engineering;1b.College of Computer and Information Technology,China Three Gorges University,Yichang 443002,China;2.School of Electronic Information,Wuhan University,Wuhan 430072,China) |
| Abstract: |
| To address challenges in computing the electromagnetic(EM) scattering of complex targets with anisotropic dielectric coatings and metallic components,the authors propose an efficient hybrid algorithm.This algorithm is designed for simulating the EM scattering of complex targets coated with anisotropic dielectric materials.Built upon impedance boundary conditions,the method utilizes surface impedance vectors to characterize the EM properties of the dielectric.It effectively leverages the advantages of the low-frequency Method of Moments(MoM) and the high-frequency Physical Optics(PO) to achieve high-precision and rapid EM simulations of dielectric-metal composite targets.By employing impedance boundary conditions(IBC) and the equivalence principle,the EM scattering problem of targets covered with thin dielectric layers is transformed into a radiation problem involving equivalent EM currents on impedance surfaces,facilitating highly accurate and fast computation of the radar cross section(RCS) for complex targets coated with anisotropic dielectric materials.To validate the algorithm’s performance,simulations are conducted on targets including square plate,simplified aircraft,and intricate satellite model.Comparative analysis reveals that the simulated results from the proposed algorithm exhibit root mean square error(RMSE) of merely 0.82 dB,1.56 dB,and 2.64 dB when juxtaposed with numerical solution,all of which are notably superior to the 3 dB engineering standard error.Moreover,the algorithm demonstrates a significant enhancement,surpassing 50%,in computational efficiency in terms of memory consumption and computational duration,substantiating both its accuracy and practical utility. |
| Key words: dielectric-metal composite target electromagnetic scattering anisotropy hybrid algorithm |
