Imaging of Ground Penetrating Radar Data Using 3-D Kirchhoff Migration

3차원 Kirchhoff 구조보정을 이용한 지표레이다자료의 영상화

  • 조동기 ((주)쓰리텍이엔지) ;
  • 서정희 (서울대학교 지구환경시스템공학부) ;
  • 최윤경 (서울대학교 지구환경시스템공학부)
  • Published : 2002.08.01

Abstract

We made a study of 3-D migration which could precisely image data of GPR (Ground Penetrating Radar) applied to NDT (Non-Destructive Test) field for the inspection of structural safety. In this study, we obtained 3-D migrated images of important targets in structuresurvey (e.g. steel pipes, cracks) by using 3-D Kirchhoff prestack depth migration scheme developed for seismic data processing. For a concrete model consisting of steel pipe and void, the targets have been well defined with opposite amplitude according to the parameters of the targets. And migrated images using Parallel-Broadside array (XX configuration) have shown higher resolution than those using Perpendicular-Broadside array (YY configuration) when steel pipes had different sizes. Therefore, it is required to analyze the migrated image of XX configuration as well as that of general YY configuration in order to get more accurate information. As the last stage, we chose a model including two steel pipes which cross each other. The upper pipe has been resolved clearly but the lower has been imaged bigger than the model size due to the high conductivity of the upper steel.

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