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A new method for GPR data velocity analysis

Heidari M.

Ground Penetrating Radar(GPR) is a powerfull tool for detecting near surface objects and has many appliction due to it's high resolution. one of the major problem we face when dealing with GPR data is estimation of velocity model of underlying earth. despite of seismic data, in GPR only zero offset data are recorded and hence we cannot use conventional velocity estimation methods used in seismic expolaration. beside often the target is a small feature like channels, small fault and etc. so in order to obtain a better image of underlying earth a fast and accurate method for velocity analysis is needed. in this paper we introduce a! velocity analysis method using diffractions. first using radon transform we seperate reflection and diffractions from recorded data, then introduce a measure to select the optimum velocity for every point of underlying earth. the proposed method is so faster than methods use wave equation for migration of diffractions and there's no need to tune any parameter. the high performane of this method is tested on both synthetic and real data.


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