基于矩量法的机身截面电磁散射特性分析

Study of electromagnetic scattering characteristics of fuselage section based on method of moments (MoM)

摘要:

本文研究目的是针对机身截面隐身设计，对比三种典型轮廓的隐身性能，为飞行器外形隐身设计提供一定参考。设计了“凹曲面”、“凸曲面”和“平板曲面”三种典型的隐身飞机机身截面轮廓，采用矩量法(method of moments，MoM)计算了这三种轮廓的雷达散射截面（radar cross section，RCS），并对表面电流密度分布进行了研究。分析了RCS随方位角的变化特性，比较了各截面的隐身性能。分析结果表明，凹曲面和凸曲面机身都可以有效降低侧向RCS，其中凸曲面的隐身效能更佳。平板曲面机身除正下方一个很窄的波峰外，侧向和下方RCS都很小，在对抗仰视雷达时具有很好的隐身性能。

Abstract:

The research destination of this paper is for fuselage’s stealth design, comparing three canonical sections’ stealth performance and the result can provide support for aircraft’s shape stealth design. Three typical stealth fuselage sections (concave, convex and plane-curve) are designed and the radar cross section (RCS) and the surface current are calculated with 2-dimensional method of moments (MoM). The characteristics of RCS's variance versus the aspect angle are analyzed and the stealth performances of the sections are compared via the overall and critical angle domain's RCS averages. The analysis results show that concave and convex fuselage can reduce side RCS and the convex's stealth performance is better. Plane-curve fuselage's side and down's RCS is small except for a narrow peak right in the down direction and this fuselage has good stealth performance in countering up-looking radar.