伪码测距延迟锁定环路(DLL)性能分析

本文从延迟锁定环路(DLL)的线性模型出发,运用信号统计分析的方法,详细研究了延迟锁定环路的同步性能与相关区间、环路带宽与信噪比之间的关系,得出了采用窄相关可以显著提高同步精度的结论。计算机仿真的结果表明,当相关间隔取为0.2,对输入伪码的同步精度相比于传统的C/A码GPS接收机(相关间隔为1)有了大约3dB的提高,很大程度地减小了测距的误差。

The synchronization performance analysis of Delay locked loop (DLL) in PN code ranging system

This paper do some researching on the relations of the synchronization performance, correlation space, loop width and sig- nal- to- noise ratio based on the linear model of delay locked loop (DLL) by using statistical analytical method. And we draw a con- clusion that narrow correlation can improve the synchronization accuracy. The results of computer simulations show that the synchro- nization accuracy can be enhanced about 3dB compared to traditional GPS C/A code receiver. So the error of ranging is greatly re- duced accordingly.