Parameter Estimation of Gamma Distribution of RCS Model for High-resolution SAR Images
The Gamma distribution is used to model the radar cross section(RCS) for high-resolution synthetic aperture radar(SAR) images,and its parameters are estimated.Based on the second-kind statistics,together with the multiplicative model of speckle,for three kinds of images(intensity image,amplitude image,and multi-look processing amplitude image),an effective estimator is proposed to estimate the parameters of the Gamma distribution of RCS,and the parameter estimating process only needs the first two log-cumulants of speckle and RCS.Monte Carlo simulations of the parameter estimation of the Gamma distribution of RCS demonstrate the effectiveness of this estimator,and the RCS parameter estimating results of high-resolution SAR image show that the parameters of Gamma distribution can be used for the analysis and classification of various terrains.