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.
Suggested Citation
Oden, C., Powers, M., Wright, D., and Olhoeft, G., 2007, Improving GPR image resolution in lossy ground using dispersive migration, in IEEE Transactions on Geoscience and Remote Sensing, v. 45, no. 8, p. 2492-2499, https://doi.org/10.1109/TGRS.2006.888933.
| 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 |