说明：  该程序含有一个重要的组件，就是测量复信号的频谱，labview默认的都是测量单边谱，这个是测量正负对称的频谱，非常实用。强烈建议下载！！！
(The program contains an important component, which is to measure the spectrum of the complex signal. Labview defaults to measuring the unilateral spectrum. This is a spectrum that measures positive and negative symmetry, which is very practical. Strongly recommended to download! ! !)