一种节省内存的降维时域有限差分法及其在散射计算中的应用

A Memory-efficient Reduced Finite-difference Time-domain Method and Its Use in Scattering Calculation

介绍一种节省内存的降维时域有限差分方法 (R FDTD) ,该方法理论上可节省约 33%的场分量存贮量。本文首次把R FDTD用于散射计算 ,提出了一种更为简单直观的新的导体处理方法 ,并阐明R FDTD中连接边界、吸收边界和近 远场变换的实现方法。以TE波入射时二维柱体散射为例的计算结果表明 ,R FDTD在节省约33%内存的基础上 。

A new reduced finite difference time domain method (R FDTD) with a theoretic memory reduction of 33% in the storage of field components is presented and used to simulate scattering form radar targets. To do so, a more efficient and simpler conductor treatment technique is developed, which must calculate the induced charge on the conductor. And adjustments of connection boundary and absorbing boundary for R FDTD are discussed. Considering the TE two dimensional scattering case, as an example, the results of R FDTD equal to the normal FDTD′s perfectly while saving about 33% storage.