Sバンドレーダで観測したシークラッタの抑圧と小型船の検出

抄録

I have observed sea clutter including a target (small ship) using an S-band radar with a frequency of 3.05GHz, a beamwidth of 1.8^°, a pulsewidth of 0.5µs, and a pulse-repetition frequency of 1,600Hz. To investigate the sea clutter amplitude statistics, I introduce the Akaike Information Criterion (AIC). I have found that the sea clutter amplitudes obey the log-normal distribution with the shape parameter of σ = 0.385 for entire data and the log-normal, Weibull, and log-Weibull distributions with the shape parameters of σ = 0.379 to 0.505, c = 2.92 to 4.81, and c = 12.33 to 15.28, respectively, for data within the beam width of an antenna. The number of the smallest AIC (MAIC) of the log-normal, Weibull, and log-Weibull distributions to data are 3, 5, and 4, respectively, from 12 range sweep numbers. I have used the Weibull/CFAR (Constant False Alarm Rate) circuit which is modified a Cell-Averaging (CA) LOG/CFAR circuit. It is found that small ship is detected and sea clutter is suppressed with improvement of 24.83dB by Weibull/CFAR.