title: Dielectric Constant Modelling with Soil-Air Composition and Its Effect on Sar Radar Signal Backscattered over Soil Surface.
abstract: The objective of this paper is to present the contribution of a new dielectric constant characterisation for the modelling of radar backscattering behaviour. Our analysis is based on a large number of radar measurements acquired during different experimental campaigns (Orgeval'94, Pays de Caux'98, 99). We propose a dielectric constant model, based on the combination of contributions from both soil and air fractions. This modelling clearly reveals the joint influence of the air and soil phases, in backscattering measurements over rough surfaces with large clods. A relationship is established between the soil fraction and soil roughness, using the Integral Equation Model (IEM), fitted to real radar data. Finally, the influence of the air fraction on the linear relationship between moisture and the backscattered radar signal is discussed.
authors.affiliation: CETP/IPSL/CNRS, 10-12 av. de l'Europe, 78140 Vélizy, France. zribi@cetp.ipsl.fr.|IRD-CESBIO, 18 av. Edouard Belin, bpi 2801, 31401 Toulouse cedex 9, France. zribi@cetp.ipsl.fr.
authors.forename: Mehrez
authors.initials: M
authors.lastname: Zribi
authors.affiliation: CETP/IPSL/CNRS, 10-12 av. de l'Europe, 78140 Vélizy, France.
authors.forename: Aurélie
authors.initials: A
authors.lastname: Le Morvan
authors.affiliation: CEMAGREF, UMR TETIS, 500 rue François Breton, 34093 Montpellier cedex 5, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Baghdadi
keywords: dielectric constant; modelling; moisture; radar