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@ARTICLE{Meles:17301,
      author       = {Meles, G.A. and Greenhalgh, S. and van der Kruk, J. and
                      Green, A.G. and Maurer, H.},
      title        = {{T}aming the non-linearity problem in {GPR} full-waveform
                      inversion for high contrast media},
      journal      = {Journal of applied geophysics},
      volume       = {73},
      issn         = {0926-9851},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PreJuSER-17301},
      pages        = {174-186},
      year         = {2011},
      note         = {This 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.},
      abstract     = {We 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.},
      keywords     = {J (WoSType)},
      cin          = {IBG-3},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Geosciences, Multidisciplinary / Mining $\&$ Mineral
                      Processing},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000288525600009},
      doi          = {10.1016/j.jappgeo.2011.01.001},
      url          = {https://juser.fz-juelich.de/record/17301},
}