利用抛物线方程方法计算目标RCS

RCS Computation of Objects Using Parabolic Equation

目前的RCS计算方法主要是低频算法(如MoM、FEM、FDTD)和高频近似方法(如PO、GTD、UTD)。这两种方法各有利弊,低频算法主要处理的目标电尺寸小于或等于波长的量级,而高频近似方法则在处理上百个波长的目标时更为擅长。因此,对于几个波长和数十个波长的目标,使用一种抛物线方程方法计算RCS,推导出了用于计算目标RCS的三维抛物线方程。为了显示方法的有效性,计算了一个导体球的RCS,并与解析解对比,二者吻合得相当好。

Nowadays, the computation algorithms of RCS can be categorized into two groups, that is accurate algorithm （such as FEM, FDTD, MoM） and high frequency approximation （PO, GTD, UTD）. Each of them has their own advantages and disadvantages. The former mainly deals with the objects with dimensions of almost one wavelengh, while the latter often handles the objects with dimensions of almost hundreds of wavelenghs. Therefore, as for the objects with dimensions from tens to hundreds of wavelenghs, we developed a parabolic equation method to compute the RCS of objects. In this paper, the computation expression of RCS of objects is derived. In order to show the validity of parabolic equation, the RCS of a conductive sphere is computed and the results agree well with analytic results.