摘要
在ＦＤＴＤ方法中为了精确拟合散射体曲面边界，本文提出了分区域剖分方法，以便提高计算精度，减少网格数目，节省计算机资源和降低ＦＤＴＤ数值色散，金属三角形柱表面电流的计算与实验结果的比较，验证了此方法的有效性。在直角坐标系下，研究了ＦＤＴＤ法ＣＰ剖分技术的计算精度，将ＣＰ剖分技术推广应用于涂敷金属目标的散射问题，由Ｍａｘｗｅｌｌ方程的积分形式推导出了在涂敷吸波介质厚度很薄的情况下，散射体表面附近网格上场量迭代方程，给出了二维涂敷和部分涂敷金属目标ＲＣＳ计算结果。
In order to get accurate description of the scatterer surfaces in FDTD algorithm,and to lessen FDTD numetical dispersion and reduce the computation gild numbers so as to save the computer resource,a multiple-zone meshing method is proposed.The availability of this meshing method has been demonstrated by comparing the numerical results and experimental data of the current on a triangular cylinder.At the same time,in Cartesian coordinate system we have investigated the precision of contour Path meshing technique in FDTD algorithm and extend this technique to studying the scattering problems of conducting targets coated with absorbing materials. From Maxwell's equations in integral form we deduce iterative equations of the fields on the grids near the surfaces of scatterer as the thickness Of coating lossy material is very small.The numerical results for RCS of conducting targets coated or partially coated with absorbing materials are presented.
出处
《电波科学学报》
EI
CSCD
1996年第2期54-59,66,共7页
Chinese Journal of Radio Science
