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| HAL : hal-00670775, version 1 |
| DOI : 10.1109/LGRS.2011.2131633 |
| Fiche détaillée |  Récupérer au format |
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| IEEE Geoscience and Remote Sensing Letters (2011) Vol 8 No. 5, p 953-958 |
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| Evaluation of a Numerical Modeling Approach based on the Finite Element Method for calculating the Rough Surface Scattering and Emission of a soil layer |
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| Heather Lawrence 1, 2François Demontoux 2 |
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| (01/09/2011) |
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| We evaluate a new 3-D numericalmodeling approach for calculating the rough-surface scattering and emission of a soil layer. The approach relies on the use of Ansoft's numerical computation software High-Frequency Structure Simulator, which solves Maxwell's equations directly using the finite-element method. The interest of this approach is that it can be easily extended to studies of heterogeneous media. However, before being applied in this way, it must first be validated for the rough-surface case. In this letter, we perform this validation by comparing the results of rough-surface scattering and emission with the results of the method of moments (MoM) for a range of different roughness and permittivity conditions and with both Gaussian and exponential rough-surface autocorrelation functions. For the scattering case, we obtain results that are in agreement with the MoM to within approximately 1-3 dB for angles up to and including 40◦ and 2-4 dB for angles from 50◦ to 70◦. Agreement for emissivity is to within 3.2 and 3.6 K for low and high roughness conditions, respectively. We then illustrate the application of the new approach by calculating the emission of a two-layer system with rough surfaces, representing the soil-litter system in forests. |
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| 1 : | Écologie fonctionnelle et physique de l'environnement (EPHYSE - UR1263) |
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Institut national de la recherche agronomique (INRA) : UR1263 |
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| 2 : | Laboratoire de l'intégration, du matériau au système (IMS) |
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CNRS : UMR5218 – Université Sciences et Technologies - Bordeaux I – Institut Polytechnique de Bordeaux |
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| 3 : | Observatoire aquitain des sciences de l'univers (OASU) |
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CNRS : UMS2567 – INSU – Université Sciences et Technologies - Bordeaux I |
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| 4 : | Laboratoire d'Astrophysique de Bordeaux (LAB) |
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CNRS : UMR5804 – INSU – Université Sciences et Technologies - Bordeaux I |
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| 5 : | Université Sciences et Technologies - Bordeaux 1 |
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Université Sciences et Technologies - Bordeaux I |
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| 6 : | Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB) |
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CNRS : UMR5804 – INSU – Université Sciences et Technologies - Bordeaux I |
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| 7 : | Department of Electrical Engineering National Taiwan Ocean University |
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Keelung University |
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| 8 : | Centre d'études spatiales de la biosphère (CESBIO) |
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CNRS : UMR5126 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
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| sSE 2011 |
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| Domaine | : | Sciences de l'ingénieur/Electromagnétisme Physique/Physique/Géophysique Planète et Univers/Sciences de la Terre/Géophysique Planète et Univers/Interfaces continentales, environnement Sciences de l'environnement/Milieux et Changements globaux |
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| Electromagnetic scattering by rough surfaces – microwave emissivity – numerical simulation |
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| hal-00670775, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00670775 | |
| oai:hal.archives-ouvertes.fr:hal-00670775 | |
| Contributeur : François Demontoux | |
| Soumis le : Jeudi 16 Février 2012, 09:09:40 | |
| Dernière modification le : Mardi 19 Février 2013, 12:10:51 | |
