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@ARTICLE{Link:867180,
      author       = {Link, M. and Montzka, C. and Jagdhuber, T. and Söbjaerg,
                      S. S. and Dill, S. and Peichl, M. and Meyer, T. and Jonard,
                      Francois},
      title        = {{I}mpact of {P}ermittivity {P}atterns on {F}ully
                      {P}olarimetric {B}rightness {T}emperature {S}ignatures at
                      {L}-{B}and},
      journal      = {Progress in electromagnetics research},
      volume       = {166},
      issn         = {1070-4698},
      address      = {Cambridge, Mass.},
      publisher    = {EMW},
      reportid     = {FZJ-2019-06017},
      pages        = {75-93},
      year         = {2019},
      abstract     = {This study investigates the sensitivity of L-band (1.41
                      GHz) polarimetric brightness temperature signatures to
                      oriented permittivity patterns, which can occur e.g. in the
                      case of row and interrow soil moisture differences in
                      agricultural fields. A field experiment and model
                      simulations are conducted to verify the effects of such
                      patterns on all four Stokes parameters. We find that for an
                      artificial target resembling idealized model conditions,
                      permittivity patterns lead to systematic brightness
                      temperature modulations in dependency of the azimuthal look
                      angle. For the specific field setup, modulations reach
                      amplitudes of ~4 K and mostly affect h-polarized brightness
                      temperatures as well as the first, second and third Stokes
                      parameters. Simulations of soil moisture patterns under
                      idealized model conditions indicate even higher amplitudes
                      (up to 60 K for extreme cases). However, the effects occur
                      only for permittivity layer widths of up to 8 cm (given the
                      observing wavelength of 21 cm), which is lower than the row
                      and interrow widths typically observed in agricultural
                      settings. For this reason, and due to the idealized model
                      geometry investigated here, future studies are needed to
                      transfer the findings of this study to potential
                      applications such as the sensing of oriented soil moisture
                      patterns. Particular interest might lie in radiometry and
                      reflectometry in lower frequency ranges such as P-band,
                      where according to the threshold established here (8/21
                      wavelengths), permittivity layer widths of up to ~45 cm
                      could be observed.},
      cin          = {IBG-3},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      url          = {https://juser.fz-juelich.de/record/867180},
}