We have observed weather clutter including targets (ships) using an S-band radar with a frequency of 3.05GHz, a beamwidth of 1.8°, and a pulsewidth of 0.5μs. To investigate the weather clutter amplitude statistics, we introduce the Akaike Information Criterion (AIC). We have found that the weather clutter amplitudes obey the log-normal, Weibull, and log-Weibull distributions with the shape parameters of 0.329 to 0.477, 4.40 to 4.55, and 11.93 to 16.44, respectively, for data within the beam width of an antenna. We have proposed the log-normal/CFAR circuit which is modified a Cell-Averaging (CA) LOG/CFAR circuit. It is found that weather clutter is suppressed with improvement of 51.58dB by log-normal/CFAR.
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