车载探地雷达信号在分层介质中的散射特性

Characteristics of electromagnetic scattering from the vehicle-mounted ground penetrating radar in layered media

建立了多层分层介质散射的物理模型,基于雷达方程和斯涅尔定律给出了多层分层介质散射场强度计算公式.分析研究了分层介质的电特性参数(介电常数和损耗正切)对雷达系统的探测距离和散射场的影响.以安装于探测车上的探地雷达系统为应用背景,利用时域有限差分方法对整个车载探地雷达系统进行了建模和仿真计算,对接收到的散射回波信号进行了研究.最后将系统数值模拟结果和解析计算结果进行了对比,并对结果做出了分析.

A physical model for the electromagnetic scattering of layered media is established. Radar equation and Snell＇s law are adopted to calculate the electromagnetic scattering field of multiple layer media. The effects of the electrical properties of the layer, i.e., permittivity and loss tangent on the detection range of the radar system and scattering field are studied. The vehicle-mounted ground penetrating radar （GPR） for the exploration of lunar subsurface is taken as the background. The finite difference time domain method is used to model and calculate the whole vehicle-mounted GPR, and the intensity of the scattering echoes is studied. The simulation results are compared with the theoretical results, and they are found to be in good agreement with each other. Finally some analyses of the results are presented.