铁路路基雷达探测工作参数的设计

介绍了使用路检车装载探地雷达(Ground Penetrating Radar)对铁路路基检测的原理,结合野外探测过程中对测量深度、精度和行车速度的要求,给出了GPR现场工作测线布置的原则,理论上给出天线中心频率、时窗、采样率、测量点距的计算公式.讨论了连续测量和离散测量的关系,考虑到连续测量时水平精度的要求,给出行车速度必须满足的两个条件,从而确定行车速度的上限.为保证野外检测工作的顺利进行,结合实际情况给出了GPR工作参数的设计原则和流程.

Design of GPR working parameters for railroad trackbed inspection

The principle of railroad trackbed inspection with GPR mounted on track vehicle is introduced.In line with requirements of exploring depth,accuracy and speed in the process of field survey,the layout of GPR survey line is put forward,the center frequency of antenna,the maximum time window,the temporal sampling interval and the space between traces are calculated according to the theoretical formulas.The relationship between continuous and discrete GPR measurements is described.In view of the special need of horizontal precision in continuous survey,two conditions determining the speed of track vehicle are proposed.Then the upper limit of the speed of track vehicle is regulated.To ensure a successful operation of field survey,the values and process of GPR working parameters are designed to the real situation.