Improving GPR image resolution in lossy ground using dispersive migration

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Abstract

As a compact wave packet travels through a dispersive medium, it becomes dilated and distorted. As a result, ground-penetrating radar (GPR) surveys over conductive and/or lossy soils often result in poor image resolution. A dispersive migration method is presented that combines an inverse dispersion filter with frequency-domain migration. The method requires a fully characterized GPR system including the antenna response, which is a function of the local soil properties for ground-coupled antennas. The GPR system response spectrum is used to stabilize the inverse dispersion filter. Dispersive migration restores attenuated spectral components when the signal-to-noise ratio is adequate. Applying the algorithm to simulated data shows that the improved spatial resolution is significant when data are acquired with a GPR system having 120 dB or more of dynamic range, and when the medium has a loss tangent of 0.3 or more. Results also show that dispersive migration provides no significant advantage over conventional migration when the loss tangent is less than 0.3, or when using a GPR system with a small dynamic range. ?? 2007 IEEE.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Improving GPR image resolution in lossy ground using dispersive migration
DOI 10.1109/TGRS.2006.888933
Volume 45
Issue 8
Year Published 2007
Language English
Larger Work Title IEEE Transactions on Geoscience and Remote Sensing
First page 2492
Last page 2499