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FDTD方法是近年来得到广泛研究和应用的数值方法，具有许多无可比拟的优越性．CAD技术的介入使FDTD方法向实用化方向迈出了一大步．本文介绍如何使用CAD软件，基于复杂目标的设计图、剖面线图等描述方式，生成提供给FDTD计算程序使用的目标的几何-电磁参量描述文件．本文借助该方法计算了一种飞机在谐振区的RCS．
The FDTD method is widely used in recent years, numerical methods, with many unparalleled advantages. The intervention of CAD technology makes the FDTD method a big step toward practical application. This article describes how to generate geometry-electromagnetic parametric profiles for the purposes used by FDTD comput- ing programs using CAD software, complex target-based drawings, hatch diagrams, and more. In this paper, an RCS of the aircraft in the resonance region is calculated by this method.