分层煤质中探测浅二维目标的新方法

A Novel Method for Detection of Shallow Two-dimensional Target in Layered Media

本文提出利用时域散射信息对埋于分层媒质中的无耗二维电磁目标进行微波成像的新方法一时城变分迭代法（TVIM）。这是一种基于电磁体等效原理、变分原理和傅立叶变换的迭代方法。我们列举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TVIM的收敛性能、反演复杂目标能力、抗随机噪声等反演性能，并从理论上简要分析形成TVIM良好反演性能的原因。

A novel method,time-domain variational iterative method (TVIM ),for microwave imaging of two-dimensional lossless electromagnetic target buried in layered media using timedomain scattering data is presented. It is an iterative method derived by using the volume equivalence principle,variation principle and Fourier transform. Some typical results are given to show its performances such as the convergence property,the ability to invert arbitrary targets and the tolerance of random noise etc. Comparisions with our former method are also done. Those factors which make TVIM performs better are also investigated.