基于FDTD瞬态分析的三维目标宽带RCS频率响应的快速获取

A Fast Frequency Sweeping Method for RCS of 3D Targets Based on Transient of Finite Difference Time Domain Method

采用基于时域有限差分法(FDTD)的瞬态分析来快速获取三维目标宽带RCS频率响应.叙述了常规FDTD方法的原理,并研究了瞬态分析计算宽带RCS频率响应的过程.随后使用程序计算了导体立方体和各向同性介质立方体的频率响应情况,并与文献上的结果进行对比,证明了该算法有良好的计算精度和效率.随后计算了导体开槽空心球体和各向同性介质开槽立方体的宽带RCS频率响应特性,并对结果进行了分析.以上结果都说明该方法可靠、高效和准确.

The method of transient is applied to predict the Radar Cross Section （RCS） of a three - dimensional target over a frequency band based on Finite Difference Time Domain （FDTD） method. The theory of FDTD method is elaborated, and the application of transient method to FDTD is researched. The RCS of 3D metallic cube and dielectric cube over a frequency band are computed and the results are consistent with those of literature available. Hence the method is shown to be correct and effective. The RCS over a frequency band of a notched and hollow metallic sphere is computed, and that of a notched dielectric cube is also calculated. The results are then analyzed. It is proved through all the calculation that the approach is reliable, efficient and accurate.