理想带限条件下码跟踪环路的精度分析  

Analysis of code tracking loop accuracy under band-limited condition

作　　者：倪少杰[1] 刘瀛翔[1] 庞晶[1] 王飞雪[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《国防科技大学学报》2012年第6期170-174,共5页Journal of National University of Defense Technology

基　　金：第二届中国卫星导航学术年会青年优秀论文获奖者资助课题(CSNC2011-QY-11)

摘　　要：伪码跟踪是卫星导航接收机中的关键环节。码环的跟踪精度直接决定了接收机的定位性能,因此对码环跟踪精度的分析一直以来都是研究的热点,并且已经取得了很多重要成果。目前已有的结论大都从频域的角度表示带限信道的影响,但是频域表达式存在计算复杂,难以应用于实际情况的缺点。本文针对目前存在的不足,从时域相关函数的角度提出了码跟踪精度的解析表达式。该表达式简单直观,可以方便地应用于码环性能的分析,对导航信号接收机的设计具有重要的指导作用。Code tracking loop is a key component of Global Navigation Satellite System （GNSS） receivers which determines the accuracy of positioning performance. So analysis for its theoretical performance has been a research hotspot for decades. Many productive conclusions have been derived. However, most researches consider the impact of band limited channels in frequency domain, which is too computational to be applied in practical situations. To lighten the computational burden, an analytical expression of code tracking accuracy with correlation functions was derived, and the performance of code tracking loop could be easily assessed with the derived expression, which has guiding significance in the design of GNSS receivers.

关 键 词：卫星导航 码跟踪精度 延迟锁定环 带限信道 

分 类 号：TN921.7[电子电信—通信与信息系统]