分析信号的频谱，确定采样频率、采样的数据长度，根据FFT的计算结果分析信号的幅值和相位。调整参数进行仿真，根据仿真结果讨论采样频率、数据长度对频域分析结果的影响。-Spectral analysis of the signal to determine the sampling frequency, sampling data length, amplitude and phase of the signal analysis based on the calculation result of the FFT. Adjustment parameters for the simulation, the sampling frequency of the discussion, the data length of the impact on the frequency domain analysis of the results according to the simulation results.