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000017301 0247_ $$2DOI$$a10.1016/j.jappgeo.2011.01.001
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000017301 084__ $$2WoS$$aGeosciences, Multidisciplinary
000017301 084__ $$2WoS$$aMining & Mineral Processing
000017301 1001_ $$0P:(DE-HGF)0$$aMeles, G.A.$$b0
000017301 245__ $$aTaming the non-linearity problem in GPR full-waveform inversion for high contrast media
000017301 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2011
000017301 300__ $$a174-186
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000017301 440_0 $$014681$$aJournal of Applied Geophysics$$v73$$x0926-9851$$y2
000017301 500__ $$3POF3_Assignment on 2016-02-29
000017301 500__ $$aThis work was supported by grants from ETH Zurich and the Swiss National Science Foundation. We benefited from stimulating discussions with Dr Jacques Ernst and are indebted to Anja Klotzsche for providing the traveltime tomography starting models for some waveform inversions. We thank Dr Thomas Hansen and an anonymous reviewer for their helpful and insightful reviews of the paper.
000017301 520__ $$aWe present a new algorithm for the inversion of full-waveform ground-penetrating radar (GPR) data. It is designed to tame the non-linearity issue that afflicts inverse scattering problems, especially in high contrast media. We first investigate the limitations of current full-waveform time-domain inversion schemes for GPR data and then introduce a much-improved approach based on a combined frequency-time-domain analysis. We show by means of several synthetic tests and theoretical considerations that local minima trapping (common in full bandwidth time-domain inversion) can be avoided by starting the inversion with only the low frequency content of the data. Resolution associated with the high frequencies can then be achieved by progressively expanding to wider bandwidths as the iterations proceed. Although based on a frequency analysis of the data, the new method is entirely implemented by means of a time-domain forward solver, thus combining the benefits of both frequency-domain (low frequency inversion conveys stability and avoids convergence to a local minimum; whereas high frequency inversion conveys resolution) and time-domain methods (simplicity of interpretation and recognition of events; ready availability of FDTD simulation tools). (C) 2011 Elsevier B.V. All rights reserved.
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000017301 65320 $$2Author$$aGPR
000017301 65320 $$2Author$$aFDTD
000017301 65320 $$2Author$$aInversion
000017301 65320 $$2Author$$aTime-domain
000017301 65320 $$2Author$$aFrequency-domain
000017301 65320 $$2Author$$aBandwidth expansion
000017301 65320 $$2Author$$aStability
000017301 7001_ $$0P:(DE-HGF)0$$aGreenhalgh, S.$$b1
000017301 7001_ $$0P:(DE-Juel1)129561$$avan der Kruk, J.$$b2$$uFZJ
000017301 7001_ $$0P:(DE-HGF)0$$aGreen, A.G.$$b3
000017301 7001_ $$0P:(DE-Juel1)VDB94575$$aMaurer, H.$$b4$$uFZJ
000017301 773__ $$0PERI:(DE-600)1496997-x$$a10.1016/j.jappgeo.2011.01.001$$gVol. 73, p. 174-186$$p174-186$$q73<174-186$$tJournal of applied geophysics$$v73$$x0926-9851$$y2011
000017301 8567_ $$uhttp://dx.doi.org/10.1016/j.jappgeo.2011.01.001
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