【摘要】 对Maxwell方程进行了变形,变形后的方程将所考查的媒质空间的特性集中反映在2个本构关系式中,大大简化了FDTD方法实现的难度。为了提高精度,推导了变形后麦氏方程的高阶FDTD差分格式,实现了高阶FDTD(HO-FDTD)的理想匹配层(PML)吸收边界条件,并对介质目标的雷达散射截面(RCS)进行了数值计算,计算结果表明,该方法具有很高的计算精度和计算效率。更多还原

【Abstract】 A transform is adopted in the Maxwell’s equations,which makes the electromagnetic parame-ters of the media be reflected by two frame equations,thus simplifying the FDTD method.To improve the accuracy,the high order FDTD difference equations are derived and the anisotropic perfectly matched layer absorbing boundary conditions are studied in this paper.The radar cross section(RCS) of targets is computed with the presented method and numerical results are compared with the results obtained by the traditional method of FDTD.It is shown that,especially for electrically large targets,the resource of computation is reduced obviously without decreasing much accuracy.更多还原