一种基于Kd-tree射线追踪法的卫星RCS预估方法

A Modified Satellite RCS Prediction Method Based on Ray Tracing Combined with Kd-tree Descriptions

针对空间卫星目标的雷达散射截面(RCS)预估问题,提出了一种基于Kd-tree射线追踪法的改进物理光学(PO)方法,实现了对具有较强耦合结构的卫星目标电磁特性计算。基于卫星目标的三维面元模型,建立了其对应的Kd-tree空间分割描述结构,将其用于射线追踪,结合PO方法就可以得到给定模型的RCS预估值。数值计算结果表明,改进方法和MoM方法相比,具有相同计算精度但计算效率高得多,相比单纯PO方法,改进方法也更接近测量值。

A modified Physical Optics（PO） method is presented to predict the radar cross section（RCS） of space tar gets such as satellites which have relatively complicated and coupled structures. The Kd - tree space segmentation description structure is firstly established based on the 3D patch medel of target satellite. And it is used to implement my tracing, which is combined with PO method to figure out the RCS prediction. Numerical calculation shows that the modified approach has the same accuracy with Method of Moment（MoM） but much shorter time consumption. And the RCS obtained by new method approximates the measured one compared with pure PO method.