传输线线上脉波电流之频谱与分布及其各频率成份之辐射远近场型之差异。
The radiation pattern in the near and far field of each frequency component of the spectrum of current pulse on a transmission line.
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。
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.
当采样频率比较高时，数字化自然采样法的频谱分布与自然采样法的频谱分布类似。
When sampling frequency is quite high, frequency spectrum distributing of digital natural sampling and natural sampling is similarity.
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