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https://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 |
DOI: | 10.1109/ICGPR.2010.5550233 |
Published version: | http://dx.doi.org/10.1109/icgpr.2010.5550233 |
Appears in Collections: | Aurora harvest 5 Physics publications |
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