半無限大空間中無耗二維電磁目標的微波成像新方法
A NOVEL METHOD FOR MICROWAVE IMAGING OF TWO-DIMENSIONAL LOSSLESS ELECTROMAGNETIC TARGET IN HALF SPACE
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摘要: 本文提出利用模擬得到的時域散射信息對埋于半無限大空間中的無耗二維電磁目標進行微波成像的新方法時域變分迭代法(time-domain variational iterative method,TVIM)。這是一種基于電磁體等效原理、變分原理和傅立葉變換的迭代方法,每次迭代各計算正問題和逆問題一次,正問題采用時域有限差分(finite-difference time-domain)方法處理。列舉了一些典型的數(shù)值反演實例,并與有關(guān)文獻結(jié)果作了比較,考察了TVIM的收斂性能、反演復雜目標能力、抗隨機噪聲等反演性能,并從理論上簡要分析了形成TVIM良好反演性能的原因。
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關(guān)鍵詞:
- 微波成像; 半無限大空間; 無耗二維電磁目標
Abstract: A nvoel method,time-domain variational iterative method(TVIM),for microwave imaging of two-dimensional lossless electromagnetic target buried in half space using time-domain scattering data is presented in this paper.It is an iterative method derived using volume equivalence principle,variation principle and Fourier transform.The direct problem is sovled by finite-difference time-domain(FDTD) method and the inverse problem is solved iteratively.Some typical results are given to show its performance,such as converging property,ability to invert arbitrary targets,tolerance of random noise,etc.Comparision with the former methods is also done.Those factors which make TVIM performs better are also investigated. -
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