基于VAA的全极化探地雷达系统及其在路面塌陷勘探中的应用

A Full-polarimetric GPR System Based on VAA and Its Application in Exploration of Surface Subsidence

探地雷达作为一种浅层无损探测技术,是进行路面塌陷勘探的有效手段。与传统的商业单极化探地雷达相比,全极化探地雷达可以获得更丰富的极化信息,这些极化信息可以对地下异常体进行更加准确的探测。文中利用Vivaldi天线阵列(VAA)搭建了一套全极化探地雷达系统,提出了一种适应于该系统的数据处理方法。为了验证系统的有效性,在实验室中进行了金属二面角探测实验,实验结果证明了系统可以有效探测地下目标体。然后,将该系统应用于路面塌陷后的修补路面的检测,并对获取的全极化信息进行数据融合处理,实验分析验证了该系统可以有效检测塌陷后的修补路面。与传统单极化探地雷达相比,该系统可以获取更丰富的路面塌陷信息,为更加准确地评估路面塌陷风险提供了一种检测方法。

As a non-destructive detection technology for the shallow subsurface,ground penetrating radar(GPR)is an effective method for surface subsidence exploration.Compared with traditional commercial single-polarimetric GPR,more comprehensive polarization information can be obtained by full-polarimetric GPR,which can detect underground anomalies more accurately.Therefore,a full-polarimetric GPR system based on Vivaldi antenna array(VAA)is built in this paper,and a data processing method suitable for the system is proposed.In order to verify the effectiveness of the system,a metallic dihedral detection experiment is conducted in the laboratory.The experimental results show that the underground targets can be detected effectively by the system.Finally,the system is applied to detect the repaired pavement after surface subsidence and the obtained full-polarimetric information is processed by data fusion processing.The experimental analysis can verify the effectiveness of the system for the detection of the repaired pavement after surface subsidence.Compared with traditional single-polarimetric GPR,this system can obtain richer surface subsidence information,which provides a detection method for more accurate assessment of surface subsidence risk.