基于矩量法的机身截面电磁散射特性分析

机身截面隐身设计是飞行器外形隐身设计的一个重要的方面。设计＂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（MoM）计算三种轮廓的雷达散射截面（RCS）,并对表面电流密度分布进行研究。分析RCS随方位角的变化特性,比较各截面的隐身性能。分析结果表明：凹曲面和凸曲面机身可以有效降低侧向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。

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

The fuselage cross-section design is an important way for airplane 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 Moment（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 RCSaverages.The analysis results show that concave and convex fuselage can reduce side RCSand the convex＇s stealth performance is better.Plane-curve fuselage＇s side and down＇s RCSis small except for a narrow peak right in the down direction and such fuselage is of good stealth performance in countering up-looking radar.