Three‐dimensional diffraction tomography using GPR

Summary Ground Penetrating Radar (GPR) is a proven method of imaging the near subsurface. Most GPR interpretations rely on raw data records or records that have utilized standard seismic data processing packages. We have developed a method that will provide three-dimensional (3-D) images of the subsurface using geophysical diffraction tomography. The method described produces images of the subsurface for transmitting and receiving antennas on the surface at a fixed offset. The algorithm provides easily interpreted images and requires little specialized processing knowledge. These factors make it more useful than raw records and more usable than sophisticated migration techniques. This method was tested using computer generated models and two field studies. The studies demonstrated the ability of diffraction tomography to image both conducting and nonconducting objects at known locations and the ease of use of the algorithm. Diffraction tomography for GPR data proved useful for generating accurate 3-D images of the subsurface.