差分GPS实现探地雷达图像地形校正方法研究

TOPOGRAPHIC CORRECTION OF GPR PROFILES BASED ON DIFFERENTIAL GPS

针对在地形起伏较大的区域探地雷达获取的图像不能表达地形变化的缺点,通过探地雷达与差分GPS同步采集记录数据,实现探地雷达图像与GPS数据时间同步,选择某一标准水准面为参考面,根据时间位移和线性插值方法,将探地雷达数据进行时深转换,从而实现探地雷达地形校正。探地雷达图像地形校正前后对比表明此方法在保留地下介质体水平方向分布特征的同时,实现了探地雷达图像在垂直方向的精确校正,对地下目标的解译和精确定位有很大的帮助,对浅层活动断层探测具有一定的实际意义。

As a new type of ground detection technology,Ground Penetrating Radar（ GPR） has advantages of high resolution and fast survey and no damage in detection, especially in the exploration of shallow active fault. However,the result image of GPR is not consistent with the objective facts in undulated areas. This paper presents a new method to correct the topographic distortion of GPR image： GPR and GPS are combined to collect and record data at the same time,achieving time synchronization between the GPR data and GPS data. Specifically,through time shifting and linear interpolation method,taking a standard level for reference surface,converting the time-depth of GPR data,finally achieving topographic correction. Contrast the original GPR image and adjusted GPR image, it shows that the method can correctly express the distribution characteristics of underground medium,and it is helpful to interpret and position the underground target,especially in the shallow active fault detection program.