基于C/A码辅助的GPS M码信号盲解调

Blind Demodulation of GPS M Code Signal Assisted by C/A Code

针对GPS M码信号受到C/A码和Y码信号的干扰难以直接进行解调的问题,提出了一种基于C/A码辅助的M码盲解调方法。利用解调后的C/A码信号校正信号频偏,通过I/Q支路分离实现将C/A码信号与Y码、M码信号的剥离,最后利用M码信号的特点进行相参增强进一步提高性能。实采数据的解调实验证明了所提算法的可行性。

It is difficult to demodulate GPS M code signal directly due to the interference of C/A code and Y code signal.To solve this problem,a blind demodulation method of M code based on C/A code is proposed.The demodulated C/A code signal is used to correct the signal frequency offset,and the separation of C/A code signal from Y code and M code signal is realized through I/Q branch separation.Finally,the performance is further improved by using the characteristics of M code signal,and the feasibility of the proposed algorithm is proved by the demodulation experiment of real data.