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@ARTICLE{Meles:11380,
      author       = {Meles, G.A. and van der Kruk, J. and Greenhalgh, S. A. and
                      Ernst, J.R. and Maurer, H. and Green, A.G.},
      title        = {{A} {N}ew {V}ector {W}aveform {I}nversion {A}lgorithm for
                      {S}imultaneous {U}pdating of {C}onductivity and
                      {P}ermittivity {P}arameters {F}rom {C}ombination
                      {C}rosshole/{B}orehole-to-{S}urface {GPR} {D}ata},
      journal      = {IEEE transactions on geoscience and remote sensing},
      volume       = {48},
      issn         = {0196-2892},
      address      = {New York, NY},
      publisher    = {IEEE},
      reportid     = {PreJuSER-11380},
      pages        = {3391 - 3407},
      year         = {2010},
      note         = {Manuscript received July 2, 2009; revised October 23, 2009
                      and January 15, 2010. Date of publication June 7, 2010; date
                      of current version August 25, 2010. This work was supported
                      by grants from the Swiss Federal Institute of Technology
                      Zurich (ETH Zurich) and the Swiss National Science
                      Foundation.},
      abstract     = {We have developed a new full-waveform ground-penetrating
                      radar (GPR) multicomponent inversion scheme for imaging the
                      shallow subsurface using arbitrary recording configurations.
                      It yields significantly higher resolution images than
                      conventional tomographic techniques based on first-arrival
                      times and pulse amplitudes. The inversion is formulated as a
                      non-linear least squares problem in which the misfit between
                      observed and modeled data is minimized. The full-waveform
                      modeling is implemented by means of a finite-difference
                      time-domain solution of Maxwell's equations. We derive here
                      an iterative gradient method in which the steepest descent
                      direction, used to update iteratively the permittivity and
                      conductivity distributions in an optimal way, is found by
                      cross-correlating the forward vector wavefield and the
                      backward-propagated vectorial residual wavefield. The
                      formulation of the solution is given in a very general,
                      albeit compact and elegant, fashion. Each iteration step of
                      our inversion scheme requires several calculations of
                      propagating wavefields. Novel features of the scheme
                      compared to previous full-waveform GPR inversions are as
                      follows: 1) The permittivity and conductivity distributions
                      are updated simultaneously (rather than consecutively) at
                      each iterative step using improved gradient and step length
                      formulations; 2) the scheme is able to exploit the full
                      vector wavefield; and 3) various data sets/survey types
                      (e.g., crosshole and borehole-to-surface) can be
                      individually or jointly inverted. Several synthetic examples
                      involving both homogeneous and layered stochastic background
                      models with embedded anomalous inclusions demonstrate the
                      superiority of the new scheme over previous approaches.},
      keywords     = {J (WoSType)},
      cin          = {ICG-4},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB793},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Geochemistry $\&$ Geophysics / Engineering, Electrical $\&$
                      Electronic / Remote Sensing},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000283142800007},
      doi          = {10.1109/TGRS.2010.2046670},
      url          = {https://juser.fz-juelich.de/record/11380},
}