RCS测试中的低散射载体设计及仿真分析

Design and Simulation of Low Scattering Carrier in RCS measurement

摘要:

在雷达散射截面(RCS)测试中,低散射载体的设计结果取决于被测目标的RCS量级;为进行细节性隐身设计,获得台阶与缝隙排除载体干扰后的RCS水平,提出一种在台阶与缝隙RCS测试中的低散射载体设计方法;采用多层快速多极子算法,对低散射载体相邻曲面连接方式、台阶与缝隙在载体上的位置、前缘尖削度、倒圆半径对散射特性的影响进行仿真分析;仿真计算结果表明,控制载体表面曲率的变化、加大前缘尖削度、减小拼接曲面倒圆半径能有效降低载体前向散射水平,由于载体曲面一侧的散射水平低于平面一侧散射水平,台阶与缝隙特征应位于曲面上；对RCS测试中低散射载体设计具有指导意义。

Abstract:

The design results of low scattering carrier are determined by the scattering level of measured object. In order to implement detailed stealth design and obtain the scattering level of steps and gaps, the design methods of low scattering carrier used for RCS measurement of steps and gaps were proposed.Multilevel fast multipole algorithm (MLFMA) was appliedand the impacts of combination manner of adjacent surface, location, tapering ratio, and fillet radius on the scattering level were analyzed. The simulation results demonstrated that it could effectively reduce scattering level to reduce curvature fluctuation, increase tapering ratio, and reduce fillet radius. The steps and gaps should be located in the surface instead of the plane due to the fact that the scattering level of the surface was less than that of the plane. The method is of guidance meaning for the design of low scattering carrier in RCS measurement.