The auto power spectrum of phase function commonly has two extreme frequencies, and the corresponding frequency components decide the peak characteristics of phase function.
相函数的自功率谱一般具有两个峰值频率，其相应的频率分量决定相函数的波峰特征。
2
Using frequencyspectrum analysis of phase function to calculate its auto power spectrum can reflect its frequency structure.
利用相函数的频谱分析求其自功率谱，可以反映它的频率结构。
3
This paper presents calculation of frequency and phase difference of flow signals with spectrum analysis on basics of Fourier transform (DFT).