ACCURACY EVALUATION OF BURIED PIPE AND CAVITY POSITION DETECTION USING GROUND PENETRATING RADAR LINKED TO VRS POSITONING BY GNSS RECEIVER AND DISTANCE MEASUREMENT BY DMI

Abstract

 In order to prevent damage to previously buried objects during underground infrastructure construction, there is a need for technology to detect the location of underground objects using ground penetrating radar. Ground penetrating radar irradiates electromagnetic waves into the ground from the surface, uses the reflection from buried pipes, and measures the earth cover of buried pipes by interpreting the image. In this study, measurements were taken at a test yard where the locations of buried pipes and cavities are known, using the VRS GNSS receiver that can perform positioning with an error of several centimeters and the ground penetrating radar equipped with a distance measuring instrument. The position detection accuracy was determined by examining the shape, size, and depth of the cavity, as well as the possibility of detection. As a result, the accuracy of position detection of buried pipes and cavities linked to VRS positioning and distance measurement was within 0.2 m for horizontal range and approximately 0.05 to 0.2 m for vertical range. In addition, the vertical range increased as the depth increased.