Optimization of the Gamma-Gamma MAP filter for SAR image clutters
作者:
M. BEAUCHEMIN,
K. P. B. THOMSON,
G. EDWARDS,
期刊:
International Journal of Remote Sensing
(Taylor Available online 1996)
卷期:
Volume 17,
issue 5
页码: 1063-1067
ISSN:0143-1161
年代: 1996
DOI:10.1080/01431169608949067
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
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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