A new parameter estimation for K distribution clutter

K distribution is one of the most widely applied statistical models for SAR images clutter. Now there are several approaches to estimate the parameters of K distribution. Based on Raghavan’s method, a new method named piecewise-approximation is given in this paper, where Gamma and Beta-Prime distributions are applied to piecewisely approximate K distribution. The experiment results show that the new method broadens the applicable range of parameter, and has a higher accuracy than the method of moment.