Passive Polarimetric IR Target Classification

Thus, for Weibull statistics (o = 1=2) we require N ̧ 200. For more log-normal-like statistics (e.g., o = 1=10) we require N of order of thousands. Although we have chosen ̄ = 3 the calculations are readily performed for other values of ̄. The above analysis provides a measure of how many K-distributed random phasors must be summed together before the probability density of the amplitude of the sum can be approximated by a Rayleigh. Thus, if the clutter in a resolution cell of area Ac is K-distributed with shape parameter o, one cannot use the Central Limit Theorem to argue that the probability density for the amplitude of the clutter from a larger resolution cell of area NAc, where NÀ 1, is Rayleigh unless N satisfies (5).