Synthetic Aperture Radar Image Background Clutter Fitting Using SKS + MoM-Based Distribution

Table 4

(a) The parameter estimation expressions of several clutter models and (b) the parameter estimation methods of distribution.

(a)

Clutter models	Probability density function	Moment method	Maximum likelihood estimation
Lognormal distribution
Gamma distribution
distribution			—
distribution

(b)

Estimation method	Estimation formula
Freitas’ MoM
Fully parametric MoM
SKS
SKS + MoM

is obtained by computing the equivalent number of looks of image, in which is the mean and is the variance of image pixel intensity or amplitude, respectively [13, 17].