基于探地雷达信号瞬时质心频率的道路空洞追踪法

Road cavity tracking method based on instantaneous centroid frequency of the ground penetrating radar signal

随着我国各类道路总里程的不断上升,道路检测需求也在不断增加,探地雷达(GPR)作为一种便捷的无损检测方法得到广泛应用。GPRMax是基于时域有限差分算法的模拟探地雷达探测软件,能够为探地雷达的应用研究提供数据支持。基于希尔伯特变换求取三瞬属性是处理探地雷达数据的常用手段,但传统的三瞬属性需要组合分析才能提高数据的精度。本文基于能量导数算子求取的瞬时质心频率有效提高了数据的分辨率,利用GPRMax软件模拟探地雷达探测道路空洞,通过对比分析数据的瞬时频率、瞬时振幅以及瞬时质心频率,验证了瞬时质心频率算法的有效性。

With the continuous increase of total miles of all kinds of road in our country,the demand for road testing is increasing.Ground penetrating radar(GPR)is widely used as a convenient method of non-destructive testing.GPRMax is a software that simulates ground penetrating radar detection based on finite-difference time-domain algorithm,which can provide data support for the research of ground penetrating radar application.Obtaining the three-instantaneous attribute based on Hilbert transform is a common means to process the ground penetrating radar data,which has been recognized in the world.However,the traditional three-instantaneous attribute requires combination analysis to improve the accuracy of the data.In this paper,the instantaneous centroid frequency obtained based on the energy derivative operator is used to effectively improve the resolution of the data.In this paper,GPRMax software is used to simulate the detection of road voids by ground penetrating radar,and the instantaneous frequency,instantaneous amplitude and instantaneous centroid frequency of data are compared and analyzed to verify the effectiveness of the instantaneous centroid frequency algorithm.