Improving GPR image resolution in lossy ground using dispersive migration
By: C.P. Oden, M.H. Powers, D.L. Wright, and G.R. Olhoeft
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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.
| 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 |
| Google Analytic Metrics | Metrics page |