高频段雷达散射截面(RCS)分析作为隐身设计的基础,具有十分重要的研究意义,如何精确计算电大尺寸复杂飞机目标的RCS,是隐身设计的一个难题.针对这个问题,建立了一个无人机的真实尺寸模型,使用高精度的矩量法进行计算.为了使矩量法能适应电大尺寸复杂目标的计算,对三维实体模型进行了简化,并进行合理的网格剖分,应用多层快速多极子方法来提高计算效率,成功降低了计算量.经PEC球体验证了算法的有效性之后,对无人机模型进行计算,分别得到了单站RCS和双站RCS结果.分析结果发现单站RCS随频率的提高而增加,并受到几何外形和姿态角的影响;双站RCS的散射方向与入射波的极化方向有关,呈现出明显的对称性,并且前向散射比后向散射更为明显.%High frequencies radar cross section( RCS) analysis, as the basis of stealth design, has very important research significance. For stealth design, a difficult problem is how to calculate accurately the RCS of electrically large-scale and complex aircraft target. To solve this problem, a true size model of ummanned aerial vehicle was es-tablished and calculated with Method of Moments in high precision. In order to make the Method of Moments adapt to the calculation of electrically large-scale complex target, a 3-D entity model was simplified and divided properly. And a Multilevel Fast Multipole Method was used to increase calculation efficiency. Through these, the calculation was reduced successfully. After the calculation of PEC sphere, the effectiveness of the proposed algorithm was veri-fied, RCS of the UAV model was calculated, and the monostatic RCS and bistatic RCS were obtained. Analyses for the results show that the monostatic RCS increases as frequency increases, and is affected by the geometrical shape and angle. The scattering direction of bistatic RCS is affected by polarization direction of incident wave and presents obvious symmetry, and the prior scattering is more obvious than back scattering.
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