Examples of reverse‐time migration of single‐channel, ground‐penetrating radar profiles

Fisher, Elizabeth; McMechan, George A.; Annan, A. P.; Cosway, S.W.

doi:10.1190/1.1443271

Cited by 167 publications

(67 citation statements)

References 35 publications

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“…As long as precise amplitude reconstruction is not a primary interest (e.g., we are only measuring wavefield kinematics) and with the basic assumption that the subsurface electric properties are independent of frequency, many of the migration algorithms developed for seismic data analysis can be applied directly to GPR data without modification. While not generally true, the assumption of frequency-independent material properties is a reasonable first-order approximation in most cases, and often good migration results are obtained with any of the standard migration tools (Fisher et al, 1992a;Fisher et al, 1992b;Bradford et al, 1996;Bradford and Loughridge, 2003;Pipan et al, 2003;Bradford and Harper, 2005).…”

Section: Review Of Prestack Depth Migration Velocity Estimationmentioning

confidence: 99%

Applying reflection tomography in the postmigration domain to multifold ground-penetrating radar data

Bradford

2006

GEOPHYSICS

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Acquisition and processing of multifold groundpenetrating radar (GPR) data enable detailed measurements of lateral velocity variability. The velocities constrain interpretation of subsurface materials and lead to significant improvement in image accuracy when coupled with prestack depth migration (PSDM). Reflection tomography in the postmigration domain was introduced in the early 1990s for velocity estimation in seismic reflection. This robust, accurate method is directly applicable in multifold GPR imaging. At a contaminated waste facility within the U.S. Department of Energy's Hanford site in Washington, the method is used to identify significant lateral and vertical velocity heterogeneity associated with infilled waste pits. Using both the PSDM images and velocity models in interpretation, a paleochannel system that underlies the site and likely forms contaminant migration pathways is identified.

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Section: Review Of Prestack Depth Migration Velocity Estimationmentioning

confidence: 99%

Applying reflection tomography in the postmigration domain to multifold ground-penetrating radar data

Bradford

2006

GEOPHYSICS

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“…In all of these efforts, traveltime information is exploited in standard scalar imaging techniques ͑e.g., Gazdag, 1978;Stolt, 1978;Curlander and McDonough, 1991;Fisher et al, 1992b͒. Essentially, only arrival time, or phase, information is exploited; amplitude decay or radiation patterns of the antennas used are not properly accounted for.…”

Section: Ground-coupled Antennasmentioning

confidence: 99%

Surface and borehole ground-penetrating-radar developments

2010

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During the past 80 years, ground-penetrating radar ͑GPR͒ has evolved from a skeptically received glacier sounder to a full multicomponent 3D volume-imaging and characterization device. The tool can be calibrated to allow for quantitative estimates of physical properties such as water content. Because of its high resolution, GPR is a valuable tool for quantifying subsurface heterogeneity, and its ability to see nonmetallic and metallic objects makes it a useful mapping tool to detect, localize, and characterize buried objects. No tool solves all problems; so to determine whether GPR is appropriate for a given problem, studying the reasons for failure can provide an understanding of the basics, which in turn can help determine whether GPR is appropriate for a given problem. We discuss the specific aspects of borehole radar and describe recent developments to become more sensitive to orientation and to exploit the supplementary information in different components in polarimetric uses of radar data. Multicomponent GPR data contain more diverse geometric information than single-channel data, and this is exploited in developed dedicated imaging algorithms. The evolution of these imaging schemes is discussed for ground-coupled and air-coupled antennas. For air-coupled antennas, the measured radiated wavefield can be used as the basis for the wavefield extrapolator in linearinversion schemes with an imaging condition, which eliminates the source-time function and corrects for the measured radiation pattern. A handheld GPR system coupled with a metal detector is ready for routine use in mine fields. Recent advances in modeling, tomography, and full-waveform inversion, as well as Green's function extraction through correlation and deconvolution, show much promise in this field.

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“…Continuous multi-offset data or multi-fold data acquisition is analogous to commonmidpoint (CMP) data acquisition in seismic reflection (Yilmaz, 2001). While these acquisition and processing methodologies are more labor intensive and time consuming, the advantages in improving the quality of GPR images are well documented Fisher et al, 1992a;Fisher et al, 1992b;. Additionally, multi-fold data enable detailed measurement of both lateral and vertical permittivity variations using velocity analysis .…”

Section: Introductionmentioning

confidence: 99%

Material Property Estimation for Direct Detection of DNAPL using Integrated Ground-Penetrating Radar Velocity, Imaging and Attribute Analysis

Bradford¹,

Holbrook²,

Smithson³

2004

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Examples of reverse‐time migration of single‐channel, ground‐penetrating radar profiles

Cited by 167 publications

References 35 publications

Applying reflection tomography in the postmigration domain to multifold ground-penetrating radar data

Applying reflection tomography in the postmigration domain to multifold ground-penetrating radar data

Surface and borehole ground-penetrating-radar developments

Material Property Estimation for Direct Detection of DNAPL using Integrated Ground-Penetrating Radar Velocity, Imaging and Attribute Analysis

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