MDL原理によるシークラッタの統計的性質

概要

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We have observed sea clutter using an X-band radar with a frequency of 9.41GHz, a beamwidth of 1.0°, and a pulsewidth of 0.5μs. To investigate sea clutter amplitude statistics, we introduce four probability distribution models and the Minimum Description Length (MDL) principle, which is more rigorous comparison between the distributions than the Akaike Information Criterion (AIC). We have found that the sea clutter amplitude obey the generalized gamma distribution with the shape parameter of α=3.54 for entire data and the log-normal, Weibull, log-Weibull, and generalized gamma distributions with the shape parameters of σ=0.467, c=2.86 to 3.39, c=9.37 to 10.76, and α = 2.52 to 4.18, respectively, for data within the beam width of an antenna. The number of best fit of the log-normal, Weibull, log-Weibull, and generalized gamma distributions to data are 1, 2, 2, and 18, respectively.