joint probability density : 联合概率密度 amplitude probability density : 振幅概率密度 probability density function (p.d.f.) : 概率密度函数 .
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Based on radar clutter distribution, the radar clutter model is analysed for amplitude probability density distribution and power spectrum density distribution.
从雷达杂波的分布特性出发，分析了杂波的解析模型，阐述了雷达杂波幅度的概率密度分布及其功率谱密度分布。
The loads and the distribution of stress amplitude frequency are obtained by cycle count and reliable data for fatigue design are provided by probability density function fit.
用循环计数法求出载荷及应力幅频率分布，用概率密度函数拟合，为疲劳设计提供可靠性高的数据资。
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