Paper Info
Title
Estimating the soil dielectric constant via scattering measurements along the specular direction
Abstract
We propose a soil dielectric constant retrieval scheme based on the use of the ratio of power densities scattered at HH and VV polarizations along the specular direction for different incidence angles and/or frequencies. The method relies on the minimum squares technique and is based on the observation that at variance with the backscattering case, in the specular case the small perturbation method (SPM) and the Kirchhoff approach both lead to the same expression of the copolarized ratio. Accordingly, it is expected that its evaluation is rather robust, to hold under a wide range of surface roughnesses. We present method-of-moments (MoM) simulations that confirm this expectation, and we test the validity of the overall retrieval scheme, as well as its sensitivity to measurement errors (calibration errors and fading or speckle noise), by applying the algorithm to data simulated by using the MoM. Theoretical and practical problems related to the implementation of measurements along the specular direction are also discussed. The proposed method is amenable to the new generation of bistatic remote sensing instruments.
Year
DOI
Venue
2005
10.1109/TGRS.2004.841357
IEEE T. Geoscience and Remote Sensing
Keywords
Field
DocType
dielectric constant,soil moisture,surface roughness,speckle noise,permittivity,indexing terms,backscatter,power density,method of moments,remote sensing,measurement error
Remote sensing,Specular reflection,Backscatter,Optics,Bistatic radar,Scattering,Speckle noise,Mathematics,Observational error,Calibration,Method of moments (statistics)
Journal
Volume
Issue
ISSN
43
2
0196-2892
Citations 
PageRank 
References 
9
0.87
7
Authors
4
Name
Order
Citations
PageRank
Ceraldi, E.1101.27
Giorgio Franceschetti242054.26
A. Iodice315817.58
Daniele Riccio4781118.99