High-resolution GPR Diffraction Wave Imaging Based on Plane Wave Deconstruction Filtering
As an effective exploration approach in subsurface geological survey,ground pene-trating radar(GPR)can be deployed easily and achieve non-destructive detection.Its appli-cation scenario covers geotechnical engineering,geological engineering quality inspection,polar permafrost region exploration and lunar probe.Due to the distinction of permittivity between small-scale anomalous bodies and background media,the generated electromagnetic response can be recorded in the acquired GPR data.From this unique wavefield,we can ana-lyse the velocity and migration processing to gain a high-resolution image of geological anom-alies.However,the conventional B-scan data contains plenty of waveform such as direct wave,reflection wave and noise,which lead to low-quality imaging result.To provide an ac-curate dataset and reasonable interpretation,we analyzed the characteristics of various wave-field appeared in the GPR B-scan profile.In virtue of slope discrepancies with different wave-forms,this paper introduced plane-wave destruction(PWD)filters which can estimate the local slope of events and extract diffraction waveform from original profile.Pure diffractions profile allows us to build the migration velocity model and to migrate the dataset.The pro-posed method can output high-resolution velocity model and final migrated diffractions pro-file of GPR B-scan.With these supplements the scale,position,and permittivity of anoma-lous structures are estimated expediently.The high feasibility of proposed workflow has been embodied via a test of synthetic GPR data.Also,a real GPR data acquired in perma-frost are used to illustrate the high performance of the method.
NETL
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万方数据
