任意理想导电目标的NURBS曲面建模与RCS预估

少量的NURBS参数曲面足够描述任意目标的几何形状,通过Cox-De Boor变换算法可将任意NURBS曲面拆分为Bezier曲面。针对NURBS曲面目标模型,提出了非常适合于工程应用的目标电磁散射建模方法。该方法使用CAD软件(如UG等)进行复杂目标几何建模,通过其IGES接口传递模型数据;应用驻相法计算Bezier曲面上的物理光学(PO)散射场积分,快速、准确地获得任意复杂目标的RCS;讨论了NURBS曲面目标几何建模及其RCS计算中的关键技术。最后通过算例验证了理论算法和计算程序的有效性。

Modeling using NURBS surfaces and RCS prediction of arbitrary perfectly conducting targets

Arbitrary targets can be modeled with small number of NURBS parametric surfaces,and expanded into Bezier patches via Cox-De Boor algorithm.For NURBS parametric surfaces targets,a method suitable for engineering application is presented.Aided with CAD modeling software such as UG,the complex targets can be modeled easily,their geometry data can be transferred freely in terms of the IGES.By using stationary phased method to calculate the physical optics(PO) integral over the Bezier parametric surface,the RCS of the targets is obtained accurately and quickly.The several key techniques for evaluate RCS of targets modeled with NURBS surfaces are discussed For comparison,a number of models are made,comparing the RCS results with other methods and experiment data,excellent agreement is got.