半无限大空间中二维目标微波成象的新方法

A Novel Method for Microwave Imaging of Two Dimensional Electromagnetic Target in Half Space

提出了一种利用模拟测量得到的时域散射信息对埋于半无限大空间中的二维电磁目标进行微波成象的新方法——时域变分迭代法（Ｔｉｍｅ－ＤｏｍａｉｎＶａｒｉａｔｉｏｎａｌＩｔｅｒａｔｉｖｅＭｅｔｈｏｄ，ＴＶＩＭ）．列举了一些典型的数值反演实例，并与有关文献结果作了比较，考察了ＴＶＩＭ的收敛性能、反演复杂目标能力和抗随机噪声等反演性能。

A novel method for microwave imaging of two dimensional lossless electromagnetic target which buried in half space using time domain scattering data is presented in this paper.It is an iterative method derived volume equivalence principle,variation principle,Fourier transform.We name it as time domain variational iterative method(TVIM).In each iteration,both the direct and inverse problems are solved once.The direct problem is solved by finite difference time domain(FDTD)method and the inverse problem is solved iteratively.Some Typical numerical results are given to show its inversion performance such as converging property,ability to invert arbitrary targets,tolerance of random noise et al.Comparision with our former method is also done.Those factors which make TVIM performs better are investigated.