Under strong wind caused by a low pressure with fronts passing near Honshu, I have observed weather clutter containing targets (ships) using an X‐band marine radar with a frequency of 9.41 GHz, a beamwidth of 1.0°, a pulsewidth of 0.5 μs, and a pulse‐repetition frequency of 1600 Hz. To investigate such clutter amplitude statistics, I have introduced the Nakagami‐m distribution to radar signal processing for the first time and used the Akaike Information Criterion (AIC). It has been found that the weather clutter amplitudes obey the Nakagami‐m distribution with the shape parameter of m = 5.85 for entire data and the log‐normal, Weibull, log‐Weibull, and Nakagami‐m distributions with the shape parameters of σ = 0.189 to 0.259, c = 6.52 to 7.81, c = 26.66 to 35.51, and m = 5.23, respectively, for small data within the beam width of an antenna. The number of the minimum AIC (MAIC) of the log‐normal, Weibull, log‐Weibull, and Nakagami‐m distributions to data is 4, 12, 4, and 1, respectively, from 21 small data. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译：

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X波段海洋雷达观测到的Nakagamim分布式天气杂波的振幅统计

在由低压造成的强风作用下，其前端经过本州附近，我观察到使用X波段船用雷达以9.41 GHz的频率，1.0°的波束宽度，0.5μs的脉冲宽度，脉冲重复频率为1600 Hz。为了研究这种杂波振幅统计数据，我将Nakagami-m分布首次引入雷达信号处理中，并使用了Akaike信息准则（AIC）。已经发现，整个数据的天气杂波振幅服从Nakagami-m分布，形状参数为m  = 5.85，形状参数为对数正态分布，Weibull，log-Weibull和Nakagami-m分布，σ  = 0.189至0.259，c  = 6.52对于天线波束宽度内的小数据，c  = 26.66至35.51 ，c = 26.66至35.51，m  = 5.23。从21个小数据开始，对数正态分布，Weibull，对数Weibull和Nakagami-m分布的最小AIC（MAIC）数分​​别为4、12、4和1。©2021日本电气工程师学会。由Wiley Periodicals LLC发布。