探地雷达在地下介质中传播路径的计算  

Calculation of propagation path of GPR in media subsurface

作　　者：蔚建斌[1] 陈自力[1] 江涛[1] 

机构地区：[1]军械工程学院光学与电子工程系,河北石家庄050003

出　　处：《电波科学学报》2009年第5期925-928,933,共5页Chinese Journal of Radio Science

摘　　要：由于地下介质和空气的电磁特性不一致,探地雷达的发射信号在不同介质中传播时,传播速度和传播路径会发生改变,传播速度不再保持恒定,而且传播路径也不再是沿直线传播。当地下介质由单一均匀介质组成时,理论计算传播路径需要求解一个四次方程,计算量大,特别是地下介质由多个单一均匀介质组成时,无法得到解析的理论计算结果。根据电磁波的传播特性,给出了电磁波在地下单层介质传播时的简易计算方法。并以此为基础,首次给出了地下多层介质时的简易计算方法和解析结果。实际计算结果表明:简易计算结果与理论结果保持一致,比工程化计算方法的精度更高,计算量基本不变。As the electromagnetic property is different between media subsurface and the air, the transmitting signal of ground penetrating radar （GPR） would change its propagation path and velocity. Refraction causes no constant velocity and no straight propagation path. When the medium subsurface is homogeneous, it is needed to calculate a quartic equation during the solution procedure of propagation path. Especially when the medium subsurface is made up by multiple homogeneous layers,it is impossible to obtain a theoretical and analytic result. According to the propagation characteristic, a simplified method is given to resolve the propagation path in homogeneous medium. And a simplified method and analytic result are given between multiple homogenous media for the first time. The results from the simplified and theoretical methods are uniform. The precision of the simplified method is better than the one of engineering method, while the computational amount is the same.

关 键 词：探地雷达 地下介质 传播路径 

分 类 号：TN957[电子电信—信号与信息处理]