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作战飞机日益受到由雷达控制的防空系统的威胁,气动设计师根据飞机表面对电磁波散射的理论,设计出雷达特征很低的作战飞机或改进现役飞机的战术以避开对方的防御系统。本文所介绍的方法用于估算带外挂物的构形复杂的飞机的雷达特征。雷达特征可通过确定雷达探测方向上目标的雷达散射截面(RCS)加以估算,对于尺寸比雷达波长大得多的弯曲元(如翼面),可运用物理光学和几何光学估算其RCS,还需运用散射公式引入边缘的散射特性,几何输入等同于通常气动面板法的组合,并且通过高阶法估算面板的主曲率,可以将飞机弯曲面元的影响考虑进去,边缘的散射则根据边缘的锐度和几何形状来考虑。总的RCS可通过叠加所有反射面及边缘元确定。这样,气动表面的离散性不用更改就能利用。本文讨论了在典型雷达照射下的主要几何体和携带外挂物及不携带外挂物战斗机的雷达特征。
Combat aircraft are increasingly threatened by radar-controlled air defense systems. Based on the theory of aircraft surface scattering of electromagnetic waves, aerodynamic designers design tactical aircraft with very low radar characteristics or tactics to improve active aircraft to avoid opposing defenses. The method described in this paper is used to estimate the radar characteristics of a complex aircraft with a plug-in. Radar features can be estimated by determining the radar cross section (RCS) of the target in the radar detection direction. For curved elements (such as airfoils) much larger than the radar wavelength, physical and geometrical optics can be used to estimate their RCS. Using the scattering formula to introduce the scattering characteristics of the edge, the geometrical input is equivalent to the combination of the usual aerodynamic panel method, and the influence of the curved surface elements of the aircraft can be taken into account by the high-order method to calculate the principal curvature of the panel. Degree and geometry to consider. The total RCS can be determined by superimposing all reflection surfaces and edge elements. In this way, the aerodynamic surface dispersion can be used without change. This article discusses the major geometries and the radar features that carry outbound and out-of-port fighter jets under the typical radar illumination.