Optimization of the Gamma-Gamma MAP filter for SAR image clutters |
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| Authors: | M. BEAUCHEMIN K. P. B. THOMSON G. EDWARDS |
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| Affiliation: | Centre de recherche en geomatique, Faculte de foresterie et geomatique, Pavilion Casault , Universite Laval , Sainte-Foy, Quebec, G1K. 7P4, Canada |
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| Abstract: | The Gamma-Gamma Maximum a posteriori filter provides an estimate of the speckle-free radar cross-section when both the radar reflectivity and the speckle distributions are gamma-distributed. In this Letter, it is shown that a factor greater than two in precision can be typically gained in the radar cross-section estimate in the case of natural land Synthetic Aperture Radar (SAR) clutters. This is accomplished by using the normalized logarithmic estimator which is a more accurate index than the coefficient of variation to deduce the local heterogeneity parameter. |
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