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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。
Stealth aircraft fuselage side edge is a lateral important scattering source, the study of its electromagnetic scattering characteristics of great significance. The model of lateral edge analysis of the fuselage is established and the MLFMM algorithm is used to calculate the azimuthal distribution of the radar cross section (RCS) along the horizontal plane. The three-dimensional evaluation of RCS peak, peak width and sidelobe mean Based on this method, the polarization and frequency characteristics of electromagnetic scattering from the side edges of the fuselage are analyzed. For the three key geometric parameters of edge length, bevel angle and edge thickness, a variable parameter model is established and simulated by RCS Sensitivity of geometric parameters. The results show that the peak value of RCS is sensitive to the length of the edge and the angle of the edge of the edge. The width of the peak is sensitive to the frequency. The average value of the side lobe is sensitive to the frequency and edge angle.