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| Titel |
Detecting a subsurface cylinder by a Time Reversal MUSIC like method |
| VerfasserIn |
Raffaele Solimene, Angela Dell'Aversano, Giovanni Leone |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250095497
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| Publikation (Nr.) |
 EGU/EGU2014-10953.pdf |
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| Zusammenfassung |
| In this contribution the problem of imaging a buried homogeneous circular cylinder is dealt
with for a two-dimensional scalar geometry. Though the addressed geometry is extremely
simple as compared to real world scenarios, it can be considered of interest for a classical
GPR civil engineering applicative context: that is the subsurface prospecting of urban area in
order to detect and locate buried utilities.
A large body of methods for subsurface imaging have been presented in literature [1],
ranging from migration algorithms to non-linear inverse scattering approaches. More
recently, also spectral estimation methods, which benefit from sub-array data arrangement,
have been proposed and compared in [2].Here a Time Reversal MUSIC (TRM) like method is
employed.
TRM has been initially conceived to detect point-like scatterers and then generalized to
the case of extended scatterers [3]. In the latter case, no a priori information about the
scatterers is exploited. However, utilities often can be schematized as circular cylinders. Here,
we develop a TRM variant which use this information to properly tailor the steering vector
while implementing TRM. Accordingly, instead of a spatial map [3], the imaging procedure
returns the scatterer’s parameters such as its center position, radius and dielectric
permittivity.
The study is developed by numerical simulations. First the free-space case is considered
in order to more easily introduce the idea and the problem mathematical structure. Then the
analysis is extended to the half-space case. In both situations a FDTD forward solver is used
to generate the synthetic data. As usual in TRM, a multi-view/multi-static single-frequency
configuration is considered and emphasis is put on the role played by the number of available
sensors.
Acknowledgement
This work benefited from networking activities carried out within the EU funded
COST Action TU1208 "Civil Engineering Applications of Ground Penetrating
Radar."
[1] A. Randazzo and R. Solimene, “Development Of New Methods For The Solution Of
Inverse Electromagnetic Scattering Problems By Buried Structures: State of the Art and Open
Issues ,”in COST ACTION TU1208: CIVIL ENGINEERING APPLICATIONS OF
GROUND PENETRATING RADAR, Proceedings of first Action’s General Meeting, 2013.
ISBN: 978-88-548-6191-6.
[2] S. Meschino, L. Pajewski, M. Pastorino, A. Randazzo, G. Schettini, "Detection of
subsurface metallic utilities by means of a SAP technique: Comparing MUSIC-
and SVM-based approaches, Journal of Applied Geophysics, vol. 97, pp. 60–68,
2013.
[3] E. A. Marengo,F. K. Gruber,F. Simonetti, “Time-reversal MUSIC imaging of
extended targets,” IEEE Trans Image Process. vol. 16, pp. 1967-84, 2007 |
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