无载频脉冲探地雷达性能分析及其FD—TD法数值模拟计算

Study about the Properties of a Carrier-Free Pulse Ground Penetrating Radar(GPR) and Their Numerical Simulation by 2. 5D FD-TD Method

探测深度和分辨率是深地雷达的两项重要指标，本文分别对无载频脉冲探地雷达的探测深度和分辨率进行了分析，北出了影响雷达探测深度和分辨率的因素，并利用2．5维时城有限差分（FD－TD）方法对雷达的探测性能进行了数位模拟计算，给出了地下单体目标和多作目标的回波信号电平图，并将部分计算结果与实验测试结果进行了对比，二者具有比较好的一致性。

The maximum detection depth and the minimum resolution are two important factors of a Ground Penetrating Radar (GPR). Tbe detectable depths and resolution are firstly analysed for the cfor-free GPR spotems. The dominant parameters influendng the properties of a GPR system are studied. The pseudo-color pictures of different buried objects are calculated by 2. 5 Dimension Finite-Difference Time - Domain (2. 5D- FDTD) method in details. The comparsion between the result calculated by 2. 5D-FDTD method and the one by our GPR sysem is made, and good agreement is obtained.