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