Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/63391
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Type: Conference paper
Title: Tackling the non-linearity problem in GPR waveform inversion
Author: Meles, G.
Greenhalgh, S.
Green, A.
Van der Kruk, J.
Citation: Proceedings of XIII International Conference on Ground penetrating Radar (GPR 2010), held in Leece, Italy, 21-25 June 2010: pp.698-703
Publisher: IEEE
Publisher Place: www
Issue Date: 2010
ISBN: 9781424446056
Conference Name: International Conference on Ground penetrating Radar (13th : 2010 : Leece, Italy)
Statement of
Responsibility: 
G. A. Meles, S. A: Greenhalgh, A. G. Green and J. van der Kruk
Abstract: Crosshole radar tomography is a non-invasive tool used in diverse geological, hydrogeological and engineering investigations. Conventional tomograms provided by standard ray-based techniques have limited resolution. Higher resolution radar tomograms can be derived by using full-waveform inversion schemes. However, despite the theoretical improvement in resolution, convergence problems can arise in the application of full-waveform schemes due to the ill-posed nature of the inverse problem and the high non-linearity of the relationship between the model parameters and the scattered fields (i.e. the forward problem). We present here a new inversion scheme that starts with a low-pass filtered version of the radargrams and progressively expands the frequency bandwidth as the iterations proceed, thus reducing the likelihood of the inversion getting trapped in a local minimum. The benefits over standard fullwaveform time- domain inversion are demonstrated by means of three synthetic examples.
Rights: ©2009 IEEE
RMID: 0020104176
DOI: 10.1109/ICGPR.2010.5550233
Appears in Collections:Physics publications

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