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| Titel |
E2GPR - Edit your geometry, Execute GprMax2D and Plot the Results! |
| VerfasserIn |
Daniele Pirrone, Lara Pajewski |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250114275
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| Publikation (Nr.) |
 EGU/EGU2015-14589.pdf |
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| Zusammenfassung |
| In order to predict correctly the Ground Penetrating Radar (GPR) response from a particular
scenario, Maxwell’s equations have to be solved, subject to the physical and geometrical
properties of the considered problem and to its initial conditions. Several techniques have
been developed in computational electromagnetics, for the solution of Maxwell’s
equations. These methods can be classified into two main categories: differential
and integral equation solvers, which can be implemented in the time or spectral
domain. All of the different methods present compromises between computational
efficiency, stability, and the ability to model complex geometries. The Finite-Difference
Time-Domain (FDTD) technique has several advantages over alternative approaches: it
has inherent simplicity, efficiency and conditional stability; it is suitable to treat
impulsive behavior of the electromagnetic field and can provide either ultra-wideband
temporal waveforms or the sinusoidal steady-state response at any frequency within the
excitation spectrum; it is accurate and highly versatile; and it has become a mature and
well-researched technique. Moreover, the FDTD technique is suitable to be executed on
parallel-processing CPU-based computers and to exploit the modern computer visualisation
capabilities.
GprMax [1] is a very well-known and largely validated FDTD software tool, implemented by
A. Giannopoulos and available for free public download on www.gprmax.com, together with
examples and a detailled user guide. The tool includes two electromagnetic wave simulators,
GprMax2D and GprMax3D, for the full-wave simulation of two-dimensional and
three-dimensional GPR models. In GprMax, everything can be done with the aid of simple
commands that are used to define the model parameters and results to be calculated. These
commands need to be entered in a simple ASCII text file. GprMax output files can be stored
in ASCII or binary format. The software is provided with MATLAB functions, which can be
employed to import synthetic data created by GprMax using the binary-format
option into MATLAB, in order to be processed and/or visualized. Further MATLAB
procedures for the visualization of GprMax synthetic data have been developed
within the COST Action TU1208 [2] and are available for free public download on
www.GPRadar.eu. The current version of GprMax3D is compiled with OpenMP, supporting
multi-platform shared memory multiprocessing which allows GprMax3D to take
advantage of multiple cores/CPUs. GprMax2D, instead, exploits a single core when
executed.
E2GPR is a new software tool, available free of charge for both academic and commercial
use, conceived to: 1) assist in the creation, modification and analysis of GprMax2D
models, through a Computer-Aided Design (CAD) system; 2) allow parallel and/or
distributed computing with GprMax2D, on a network of computers; 3) automatically
plot A-scans and B-scans generated by GprMax2D. The CAD and plotter parts of
the tool are implemented in Java and can run on any Java Virtual Machine (JVM)
regardless of computer architecture. The part of the tool devoted to supporting parallel
and/or distributed computing, instead, requires the set up of a Web-Service (on
a server emulator or server); in fact, it is currently configured only for Windows
Server and Internet Information Services (IIS). In this work, E2GPR is presented
and examples are provided which demonstrate its use. The tool can be currently
obtained by contacting the authors. It will soon be possible to download it from
www.GPRadar.eu.
Acknowledgement
This work is a contribution to the COST Action TU1208 “Civil Engineering Applications
of Ground Penetrating Radar.” The authors thank COST for funding the Action
TU1208.
References
[1] A. Giannopoulos, “Modelling ground penetrating radar by GprMax,” Construction and
Building Materials, vol. 19, pp. 755-762, 2005.
[2] L. Pajewski, A. Benedetto, X. Dérobert, A. Giannopoulos, A. Loizos, G. Manacorda, M.
Marciniak, C. Plati, G. Schettini, I. Trinks, "Applications of Ground Penetrating Radar in
Civil Engineering – COST Action TU1208," Proc. 7th International Workshop on
Advanced Ground Penetrating Radar (IWAGPR), 2-5 July 2013, Nantes, France, pp.
1-6. |
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