Impact of permittivity patterns on fully polarimetric brightness temperature signatures at l-band

Agriculture; Modulation; Permittivity; Polarimeters; Soil moisture; Temperature; Agricultural fields; Agricultural setting; Artificial targets; Brightness temperatures; Field experiment; Four Stokes parameters; Idealized models; Lower frequencies; Luminance

Abstract :

[en] —This study investigates the sensitivity of L-band (1.41 GHz) polarimetric brightness temperature signatures to oriented permittivity patterns, which can occur for example 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. © 2019, Electromagnetics Academy. All rights reserved.

Disciplines :

Environmental sciences & ecology
Electrical & electronics engineering

Author, co-author :

Link, M.; German Aerospace Center (DLR), Microwaves and Radar Institute, PO BOX 1116, Wessling, 82234, Germany

Montzka, C.; Forschungszentrum Jülich GmbH, Institute of Bio-and Geosciences: Agrosphere (IBG-3), Jülich, 52425, Germany

Jagdhuber, T.; German Aerospace Center (DLR), Microwaves and Radar Institute, PO BOX 1116, Wessling, 82234, Germany

Søbjærg, S. S.; National Space Institute, Technical University of Denmark, Kongens Lyngby, 2800, Denmark

Dill, S.; German Aerospace Center (DLR), Microwaves and Radar Institute, PO BOX 1116, Wessling, 82234, Germany

Peichl, M.; German Aerospace Center (DLR), Microwaves and Radar Institute, PO BOX 1116, Wessling, 82234, Germany

Meyer, T.; Forschungszentrum Jülich GmbH, Institute of Bio-and Geosciences: Agrosphere (IBG-3), Jülich, 52425, Germany

Jonard, François ; Université de Liège - ULiège > Département de géographie > Systèmes d'information géographiques

Language :

English

Title :

Impact of permittivity patterns on fully polarimetric brightness temperature signatures at l-band

Publication date :

2019

Journal title :

Progress in Electromagnetics Research

ISSN :

1070-4698

eISSN :

1559-8985

Publisher :

Electromagnetics Academy

Volume :

166

Pages :

75-94

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 21 September 2021

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