时间序列信号的连续功率谱分析，用于求时间序列的主要周期分析-Continuous time series signal power spectrum analysis, cycle analysis used to find the time sequence

用DFT对连续时间信号进行谱分析，用DFT定义进行计算，不同抽样频率不同抽样点下的谱分析Matlab实例。(The continuous time signals are analyzed by DFT, and calculated by DFT definition. The Matlab examples are analyzed under different sampling frequencies and sampling points.)