Secondary carrier stripping tracking method

The invention provides a secondary carrier stripping tracking method which comprises the following steps: mixing an input signal with a local medium frequency signal to obtain a medium frequency mixing signal; carrying out downsampling processing to obtain a medium frequency mixing downsampled signal, the data rate of which is lower than that of the medium frequency mixing signal; mixing the medium frequency mixing downsampled signal with a carrier loop output signal; carrying out zero clearing on the output mixing signal to output I and Q branch signals; and obtaining the frequency and phasedifferences between the input signal and the local signal by means of calculation of an identifier and filtration of a filter. According to the method provided by the invention, the data sampling ratecan be reduced, the data size can be reduced and hardware resources can be saved. 本发明提供了种二次载波剥离跟踪方法，输入信号与本地中频信号混频得到中频混频信号，降采样处理，得到比中频混频信号更低数据速率的中频混频减采样信号，中频混频减采样信号与载波环路输出信号混频，输出的混频信号经过积分清零输出I、Q支路信号，经过鉴别器计算，滤波器滤波得到输入信号与本地信号之间的