有耗媒质的PML技术及其在目标探测中的应用

PML Technique of Lossy Media and Its Application to Object Detection

完全匹配层是近年来迅速发展起来的一种非常有效的吸收边界．本文进一步将非分裂完全匹配层技术扩展到有耗媒质，并将它与时域有限差分法一起用于研究有耗媒质中的目标探测问题．文中具体讨论了计算模型、天线加载以及完全匹配层媒质参数的选取；详细分析了收发天线以及收发天线与有耗媒质之间的相互耦合关系．最后给出了有耗媒质中存在空洞、金属管等散射体时，天线在媒质表面扫描所得的波形图．本文中的方法和模型更接近实际，可用于建立有耗媒质中目标探测波形的数据库，供实际参考．

Perfectly Matched Layer (PML) is one of the most efficient absorbing boundary condition recently developed in the world.In this paper,the unsplit PML method was further extended to the lossy media,and was applied to object detecting problems together with the FDTD method.The computing model,the loading of the antennas,and the selection of the PML coefficients were discussed.Also,the coupling between the transmitting and receiving antennas and the lossy medium was analyzed in detail.Finally,some examples were given,in which the antennas were scanning on the medium surface and there are arr cavity and metallic pipes existing in the lossy medium.The method and model presented in this paper are more close to realistic problems,and can be used to establish the data library of object detecting of lossy media,which is very useful to realistic applications.