北斗接收机的互相关抑制算法研究

Cross-correlation rejection algorithm based on Beidou receiver

针对弱信号捕获过程中可能受到强信号的互相关干扰导致误捕获,提出一种基于北斗二代接收机系统的互相关抑制算法。其主要思想是在基带数字处理阶段,接收机所希望检测的弱信号伪码与接收到的多颗卫星信号进行相关运算,结果减去其他卫星的互相关值,从而得到被检测的弱信号。通过仿真验证表明,该算法可以准确进行弱信号捕获,有效地提高了北斗二代接收机的捕获灵敏度。

Aimed at the weak signal capture process caused by the strong signal cross-correlation disturbance error,a cross-correlation suppression algorithm based on Beidou second generation receiver system is proposed. At the baseband digital processing stage,the weak signal pn code detected in the receiver and received satellite signal are related to operations and minus the other satellites cross-correlation values of other satellites thus the weak signal is detected. The simulation shows that the algorithm can capture weak signals,and improve the capture sensitivityof Beidou second generation receiver.