基于探地雷达的地下管线埋深估计方法

探地雷达已经成为城市地下管线，尤其是非金属管线探测的重要手段之一，但由于地下介质复杂，利用探地雷达估计地下管线埋深时仍存在精度不足和抗干扰能力弱等问题。本文提出使用三维速度谱方法来估计雷达剖面中的地下管线埋藏深度，通过自动扫描双曲线反射信号来计算出电磁波在地下介质中的传播速度。仿真数据和实际数据表明，三维速度谱方法估算的速度值与真实值之间的误差小于3.8%。最后，使用估算的速度值对探地雷达剖面进行背向传播偏移处理，获取准确的地下管线埋深。

Depth Estimation of Underground Pipeline Using Ground Penetrating Radar

Ground penetrating radar (GPR) has become an important tool for detection of underground pipes, especially non-metallic pipes in urban cities. However, the depth estimation accuracy achieved by using GPR needs to be improved, due to the inhomogeneity and complexity of the subsurface host media. In this paper, a three-dimensional velocity spectrum method is applied to estimate the velocity of electromagnetic waves in the subsurface medium through automatically searching the hyperbolic reflectors in the radargrams. Simulated and measured results show that the relative errors between the estimated and true velocities are less than 3.8%. Finally, the buried depth of the pipelines can be accurately obtained by applying the back-propagation migration algorithm to the radargrams using the estimated velocities.