隐身飞机机身侧棱电磁散射特点分析

隐身飞机机身侧棱是侧向重要散射源,研究其电磁散射特点具有重要意义。建立机身侧棱分析模型,采用多层快速多极子算法(MLFMM)进行计算,获得雷达散射截面(RCS)沿水平面方位角的分布数据;构建RCS峰值、波峰宽度、旁瓣均值三维度评价方法,基于该方法分析机身侧棱电磁散射的极化特性和频率特性;针对棱边长度、棱边尖劈角、棱边厚度三项关键几何参数,建立变参数模型并通过仿真研究RCS对几何参数的敏感性。结果表明:RCS峰值对棱边长度及棱边尖劈角比较敏感,波峰宽度对频率比较敏感,旁瓣均值对频率及棱边尖劈角比较敏感。

Analysis on electromagnetic scattering characteristic of fuselage lateral edge on stealth aircraft

The electromagnetic scattering characteristics of lateral edges of fuselage on aircrafts are studied by numerical simulation to provide some reference for the design of fuselage section. Multilevel fast multipole method (MLFMM) is selected to calculate the Radar Cross Section (RCS) of the edge at different azimuth angles after the geometric model has been built. The magnitude and the width of the peak and the average value of the sidelobe are three important values to be evaluated and they are compared at different polarization methods and frequencies. Sensitivities of the RCS to the geometric parameters - length, angle and thickness of the edge are also studied. The results show that the magnitude of the peak is sensitive to the length and the angle, the width of the peak is sensitive to the frequency, and the average value of the sidelobe is sensitive to frequencies and the angle.