Wenbin Zhou,Deshan Feng,Bin Zhang,Depeng Chen School of Info-Physics and Geomatics Engineering,Central South University,Changsha,410083,China
<正>Focused on the GPR(Ground Penetrating Radar)migration problem of steep-dip reflection and the extrapolation in laterally inhomogeneous media,to which conventional GPR migration method is difficult to adapt,which is always the focal point of the GPR data processing,the paper introduce the linear transformation of the finite difference migration,which is proposed by Zhiming Li in his doctor thesis and is essentially different from the Cartesian coordinates or the time-retarded coordinates,through a more accurate and stable computation,a no approximate equation is obtained in constant-velocity media,with the essentially different difference grid and boundary conditions,to achieve steep-dip reflection migration,then the paper extends the application to a variable-velocity geoelectric model to improve the former algorithm,with a errors factor added,the improved method is applied to a more complicated variable-velocity model,the migration imaging results shows the advantage of the improved linear transformation of the migration algorithm, which is more flexible in dealing with the geological problem with the main reflector and multiple reflection oarticles both exist.
GPR;;linear transformation;;finite difference;;reverse-time migration;;media with variable velocity
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