Polarimetric scattering from layered media with multiple species of scatterers
Geophysical media are usually heterogeneous and contain multiple species of scatterers. In this paper a model is presented to calculate effective permittivities and polarimetric backscattering coefficients of multispecies-layered media. The same physical description is consistently used in the deriv...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19970009468 2023-05-15T16:41:10+02:00 Polarimetric scattering from layered media with multiple species of scatterers Nghiem, S. V. Kong, J. A. Tassoudji, M. A. Kwok, R. Hsu, C. C. Shin, R. T. Yueh, S. H. Unclassified, Unlimited, Publicly available Aug. 1995 application/pdf http://hdl.handle.net/2060/19970009468 unknown Document ID: 19970009468 Accession ID: 97N14958 http://hdl.handle.net/2060/19970009468 Copyright, Distribution as joint owner in the copyright CASI Geophysics NASA-CR-203119 NAS 1.26:203119 Paper-95RS01247 Radio Science (ISSN 0048-6604); 30; 4; 835-852 1995 ftnasantrs 2019-07-21T03:15:54Z Geophysical media are usually heterogeneous and contain multiple species of scatterers. In this paper a model is presented to calculate effective permittivities and polarimetric backscattering coefficients of multispecies-layered media. The same physical description is consistently used in the derivation of both permittivities and scattering coefficients. The strong permittivity fluctuation theory is extended to account for the multiple species of scatterers with a general ellipsoidal shape whose orientations are randomly distributed. Under the distorted Born approximation, polarimetric scattering coefficients are obtained. These calculations are applicable to the special cases of spheroidal and spherical scatterers. The model is used to study effects of scatterer shapes and multispecies mixtures on polarimetric signatures of heterogeneous media. The multispecies model accounts for moisture content in scattering media such as snowpack in an ice sheet. The results indicate a high sensitivity of backscatter to moisture with a stronger dependence for drier snow and ice grain size is important to the backscatter. For frost-covered saline ice, model results for bare ice are compared with measured data at C band and then the frost flower formation is simulated with a layer of fanlike ice crystals including brine infiltration over a rough interface. The results with the frost cover suggest a significant increase in scattering coefficients and a polarimetric signature closer to isotropic characteristics compared to the thin saline ice case. Other/Unknown Material Ice Sheet NASA Technical Reports Server (NTRS) |
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Geophysics |
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Geophysics Nghiem, S. V. Kong, J. A. Tassoudji, M. A. Kwok, R. Hsu, C. C. Shin, R. T. Yueh, S. H. Polarimetric scattering from layered media with multiple species of scatterers |
topic_facet |
Geophysics |
description |
Geophysical media are usually heterogeneous and contain multiple species of scatterers. In this paper a model is presented to calculate effective permittivities and polarimetric backscattering coefficients of multispecies-layered media. The same physical description is consistently used in the derivation of both permittivities and scattering coefficients. The strong permittivity fluctuation theory is extended to account for the multiple species of scatterers with a general ellipsoidal shape whose orientations are randomly distributed. Under the distorted Born approximation, polarimetric scattering coefficients are obtained. These calculations are applicable to the special cases of spheroidal and spherical scatterers. The model is used to study effects of scatterer shapes and multispecies mixtures on polarimetric signatures of heterogeneous media. The multispecies model accounts for moisture content in scattering media such as snowpack in an ice sheet. The results indicate a high sensitivity of backscatter to moisture with a stronger dependence for drier snow and ice grain size is important to the backscatter. For frost-covered saline ice, model results for bare ice are compared with measured data at C band and then the frost flower formation is simulated with a layer of fanlike ice crystals including brine infiltration over a rough interface. The results with the frost cover suggest a significant increase in scattering coefficients and a polarimetric signature closer to isotropic characteristics compared to the thin saline ice case. |
format |
Other/Unknown Material |
author |
Nghiem, S. V. Kong, J. A. Tassoudji, M. A. Kwok, R. Hsu, C. C. Shin, R. T. Yueh, S. H. |
author_facet |
Nghiem, S. V. Kong, J. A. Tassoudji, M. A. Kwok, R. Hsu, C. C. Shin, R. T. Yueh, S. H. |
author_sort |
Nghiem, S. V. |
title |
Polarimetric scattering from layered media with multiple species of scatterers |
title_short |
Polarimetric scattering from layered media with multiple species of scatterers |
title_full |
Polarimetric scattering from layered media with multiple species of scatterers |
title_fullStr |
Polarimetric scattering from layered media with multiple species of scatterers |
title_full_unstemmed |
Polarimetric scattering from layered media with multiple species of scatterers |
title_sort |
polarimetric scattering from layered media with multiple species of scatterers |
publishDate |
1995 |
url |
http://hdl.handle.net/2060/19970009468 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
CASI |
op_relation |
Document ID: 19970009468 Accession ID: 97N14958 http://hdl.handle.net/2060/19970009468 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766031594007560192 |