基于NURBS建模计算形变目标RCS

RCS Calculation of Distorted Targets Based on NURBS Modeling

采用非均匀有理B样条(NURBS)对目标进行建模,利用NURBS的局部特性模拟目标在复杂电磁环境中受到各种物理作用而产生的形变,再采用物理光学(PO)方法,在NURBS曲面上进行表面电流积分,计算出目标的RCS。NURBS建模方法可以更加精确地建立目标的几何模型;并在原模型的基础上,较方便地产生形变而不需要重新建模。文中分别计算了原模型和形变后模型的RCS,以研究形变对于目标散射特性的影响。原模型的RCS计算结果与参考文献一致,说明文中所研究方法的有效性。

In this paper, targets are modeled by nonuniform rational B-spline （NURBS）, and then the local property of NURBS is applied to modeling distortions. RCS of targets are calculated by physical optics （ PO ）. NURBS can model the targets more accurately; and can make a model distorted without rebuilding it. RCS of some targets are calculated to determine the effects of distortions on these distorted targets and the results agree with those in the reference material. Also RCS of are simulated.