Effect of antennas on velocity estimates obtained from crosshole GPR data

Details

Serval ID
serval:BIB_E831BFAA1CAD
Type
Article: article from journal or magazin.
Collection
Publications
Title
Effect of antennas on velocity estimates obtained from crosshole GPR data
Journal
Geophysics
Author(s)
Irving J., Knight R.
ISSN-L
0016-8033
Publication state
Published
Issued date
2005
Peer-reviewed
Oui
Volume
70
Pages
K39-K42
Language
english
Notes
Irving2005a
Abstract
To obtain tomographic images with the highest possible resolution
from crosshole ground-penetrating radar (GPR) data, raypaths covering
a wide range of angles between the boreholes are required. In practice,
however, the inclusion of high-angle ray data in crosshole GPR inversions
often leads to tomograms so dominated by inversion artifacts that
they contain little reliable subsurface information. Here, we investigate
the problems that arise from the standard assumption that all first-arriving
energy travels directly between the centers of the antennas. Through
numerical modeling, we show that this assumption is often incorrect
at high transmitter-receiver angles and can lead to significant errors
in tomographic velocity estimates when the antenna length is a significant
fraction of the borehole spacing.
Keywords
RADAR, TOMOGRAPHY
Create date
25/11/2013 18:56
Last modification date
20/08/2019 16:11
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