地下目标瞬态谐振特性研究

利用谐振特性实现目标辨识是雷达探测领域研究的热点问题之一，地下目标在电磁波照射下也会产生外部谐振现象，该谐振信号与媒质特性、目标固有特性有关。该文通过FDTD方法计算了地下目标的瞬态谐振特性以及损耗媒质参数对目标谐振信号的影响，利用极点展开方法(SEM)对计算结果进行了分析，在计算分析的基础上研究了利用谐振特性识别地下目标的可行性。结果表明:在一定条件下，利用目标的外部谐振特性可以识别地下目标。

Study on the Transient Resonances of Buried Targets

Object discrimination based on resonant properties is one of the research topics in radar detection domain. Obvious transient resonances will take place for some kinds of underground Perfectly Electrical Conductors (PEC) targets under impulse electromagnetic field illumination. In this paper, numerical simulation of such resonances has been done by three-Dimensional Finite-Difference Time-Domain(3D-FDTD) method. The calculated results are verified by impulse Ground Penetrating Radar(GPR) measurements and good agreements are obtained. The properties of the resonant signals from buried PEC targets are analyzed through Singularity Expansion Method(SEM). The possibility for identifying buried target by its poles are studied. It is shown that one can apply resonant properties to identify buried targets under some condition.