薄涂覆目标散射中心的精确建模

doi:10.12305/j.issn.1001-506X.2023.06.01

摘要/Abstract

摘要：

目前, 针对金属目标的散射中心模型的研究已相对成熟, 但是对带有薄涂覆结构的复杂目标散射中心模型的研究较少。通过研究发现, 薄涂覆引入的影响主要体现为对散射场幅度的衰减作用。因此, 提出通过对薄涂覆对电磁波的衰减作用建模, 并在金属目标散射中心模型的基础上增加该衰减项, 以实现对薄涂覆目标的散射中心建模。该建模方法避免了直接对复杂目标整体散射进行数学建模和参数估计, 散射模型的物理意义更明确、形式更简洁。经弹头和飞机目标的全波法结果验证, 所建立的薄涂覆目标散射中心模型在雷达散射截面起伏、成像特征的仿真中均具有较高的精度。

关键词: 涂覆目标, 阻抗边界条件, 散射中心模型

Abstract:

At present, the research on the scattering center modeling of metallic targets has been relatively mature, but the study on the scattering center modeling of complex targets with thin-coated structures is insufficient. This paper finds that the influence introduced by the thin coating is mainly reflected in the attenuation of the scattered field amplitude. Therefore, it is proposed to model the attenuation effect of the thin coating on electromagnetic waves, and add this attenuation term on the basis of the metal target scattering center model to realize the modeling of the thin coating target's scattering center. This modeling method avoids the direct mathematical modeling and parameter estimation of the overall scattering of complex targets, and the scattering model is more physical and has a more concise form. The results of the full-wave method for warheads and aircraft targets verify that the thin-coated target scattering center model established in this paper has high accuracy in the simulation of radar cross section (RCS) fluctuations and imaging characteristics.

Key words: coated targets, impedance boundary condition, scattering center modeling

中图分类号:

O441

刘久祥, 肖光亮, 郭琨毅, 盛新庆. 薄涂覆目标散射中心的精确建模[J]. 系统工程与电子技术, 2023, 45(6): 1589-1596.

Jiuxiang LIU, Guangliang XIAO, Kunyi GUO, Xinqing SHENG. Accurate scattering center modeling of thin-coated targets[J]. Systems Engineering and Electronics, 2023, 45(6): 1589-1596.

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IBC涂覆区域	相对介电常数ε_r	涂覆厚度d/mm
1	16.4e^－j0.5	5
2	-	0
3	20.4e^－j0.75	9

IBC涂覆区域	相对介电常数ε_r	涂覆厚度d/mm
1	$30.1 \exp \left(-\mathrm{j} \cdot \frac{\pi}{5}\right)$	10
2	$35 \exp \left(-\mathrm{j} \cdot \frac{\pi}{6}\right)$	12
3	$64 \exp \left(-\mathrm{j} \cdot \frac{\pi}{6}\right)$	9
4	$70 \exp \left(-\mathrm{j} \cdot \frac{\pi}{6}\right)$	9
5	$\text { 51. } 2 \exp \left(-\mathrm{j} \cdot \frac{\pi}{8}\right)$	10

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