应用NURBS-UTD方法分析受扰方向图

 本文研究基于任意曲面建模的UTD方法，引入NURBS曲面建模技术对电大尺寸目标建模，给出了NURBS-UTD方法中反射射线场以及表面绕射射线场的数值求解方法。与曲面有关的具体参数，根据微分几何的基本原理结合参数曲面定义使用各种数值方法进行处理，对线积分使用定义展开。针对实际当中任意几何造型的电大尺寸平台的电磁特性分析，本文方法不仅能够处理初等解析曲面，也能够处理任意弯曲的曲面模型，并且不需要消耗大量计算资源又提高了建模精度，文中给出实例进行说明。

Analysis of Disturbed Pattern Through NURBS-UTD Method

The UTD method applied to arbitrary surfaces is studied in this paper where the NURBS technique is introduced to construct electrically large targets and on the basis of the ray-tracing work done before, the calculation of ray fields including reflected ray field and creeping ray field are given. Combining the definition of NURBS with basic principles of differential geometry, parameters used in formulas are solved by numerical means while the line integral is expended by definition. Aiming at analyzing electrically large targets with arbitrary shapes, method presented, which doesn’t need much calculation resources and possesses higher precision, can be applied not only to typical analytical objects but also to arbitrary surfaces and examples of application are given.