Abstract
AbstractIn stormy weather due to typhoon approaching the Izu Islands, I have observed sea and weather clutter containing a target (ship) using an S‐band radar with a frequency of 3.05 GHz, a beamwidth of 1.8°, a pulsewidth of 0.5 μs, and a pulse‐repetition frequency of 1600 Hz. To analyze such clutter amplitude statistics, I have used partial Q–Q plot, which is more rigorous fit of the distribution to the data than conventional Q–Q plot. It has been found that the sea and weather clutter amplitudes obey the Weibull distribution with the shape parameters of c = 6.23 for entire data and c = 5.83 to 8.78 for small data within the beamwidth of an antenna. I have applied Weibull/CFAR (constant false alarm rate) circuit configured by modifying cell‐averaging (CA) LOG/CFAR circuit to the observed data. It has been found that ship is detected, and sea and weather clutter is suppressed with improvement of 33.61 dB by Weibull/CFAR. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.
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