Generalized into local frequency from integral frequency, the method of joint time-frequency distribution effectively analyzes the signal based on the variation of frequency with time.
联合时频分布方法把整体频谱推广到局部频率，根据频率随着时间的变化情况，对信号进行有效的分析。
The time-frequency joint distribution of a target reflects well its physical structural property so it can be used as an effective means of radar target recognition.
目标的时间-频率联合分布能够很好地反映目标物理结构特征，可以作为雷达目标识别的一个有效手段。
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