基于时域多分辨分析方法的散射场计算

Electromagnetic scattering calculating based on MRTD

时域多分辨分析方法(MRTD)是近年来提出的一种新型电磁场算法,以往的工作将MRTD用于计算近场及腔体。本文将MRTD用于计算目标的散射问题,用完全匹配层(PML)作为边界条件,通过推导MRTD二维的近—远场公式,得到散射场的远场值,这样就可以计算目标雷达散射截面。并以无限长导体方柱为例,计算了其双站雷达散射截面,并与FDTD算法结果进行比较,可以看出MRTD可以大大的节约计算资源,而其计算准确度与文献FDTD结果吻合的很好。

Multiesolution time-domain(MRTD) sheme is a new way to computational electromagnaetics in recent years. It was used to deal with near-field and navity. In this paper, We have developed a multiesolution time-domain(MRTD) sheme to analyze two-dimensional scattering objects. And we also have developed a MRTD near-to-far-zone transform to evaluate RCS. Results show that the accuracy of MRTD is similar to FDTD, however,it save more memory than FDTD.