基于副载波跟踪的BOC信号跟踪环路设计  

Novel tracking loop of BOC signal based on subcarrier tracking

作　　者：杨再秀[1] 黄智刚[1] 耿生群[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《北京航空航天大学学报》2011年第2期245-248,共4页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家973计划资助项目(2010CB731800)

摘　　要：针对二进制偏移载波(BOC,Binary Offset Carrier)调制信号跟踪的模糊性问题,提出了一种新的基于副载波跟踪的环路结构.通过增加副载波跟踪模块,对副载波和扩频码进行分离跟踪,解决了BOC信号跟踪的模糊性问题;针对副载波信号周期性的特点,以正弦波作为本地信号,利用锁相环实现对副载波的稳定跟踪.通过软件仿真,分析对比了该环路的码跟踪误差、跟踪门限和平均失锁时间(MTLL,Mean Time to Lose Lock)等性能指标.结果表明,新的环路结构能在保证跟踪精度的前提下,提高对弱信号的跟踪性能,具有较高的环路稳定性.In order to eliminate the tracking ambiguity of binary offset carrier（BOC） signal,a novel tracking loop based on subcarrier tracking was proposed.Compared with traditional tracking loop,the proposed architecture provides a subcarrier locked loop to track subcarrier.The innovative tracking loop architecture resolves the tracking ambiguity problem by tracking the subcarrier and spread spectrum code respectively.The subcarrier was synchronized with the local sinusoidal signal using phase lock loop（PLL）,which exploits the periodic feature of the subcarrier of BOC signal.Figures of merit,such as code tracking error,tracking threshold and mean time to lose lock（MTLL） have been analyzed and evaluated through software simulations.Simulation results show that the novel tracking loop can improve the tracking performance of weak signal and enhance the tracking loop stability with little degradation in tracking accuracy.

关 键 词：二进制编移载波 跟踪环路 副载波跟踪 码跟踪误差 平均失锁时间 

分 类 号：TN961[电子电信—信号与信息处理]