伪相关函数方法下的带限Sin-BOC跟踪性能研究

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张羽， 周艳玲*

(湖北大学 计算机与信息工程学院，湖北 武汉 430062

摘要: 在卫星导航系统中，无模糊跟踪是恢复导航数据的重要环节之一。采用一种特殊的伪相关函数法(pseudo correlation function, PCF)，灵活设计两路本地信号的波形，分别与接收信号相关，再通过非线性运算获得单峰的相关函数，有效解决由BOC(binary offset carrier)信号自相关函数的多峰性引起的跟踪模糊问题。根据实际情况，在有限带宽条件下，针对典型信号SinBOC进行性能分析与比较。结果表明：该方法的跟踪性能明显优于不考虑模糊问题时的传统DLL方法和类BPSK(BPSKlike)方法，且PCF方法的参数取值影响跟踪精度。

关键词: 无模糊跟踪； 伪相关函数； 单峰； 有限带宽； 跟踪精度

中图分类号：TN 967           文献标志码： A

Tracking Performance Research on Band limited Sin BOC Signals by Pseudo Correlation Function

ZHANG Yu， ZHOU Yanling

 (School of Computer and Information Engineering,HubeiUniversity,Wuhan430062,China)

Abstract: Unambiguous tracking is one of the most important steps to recover the navigation data in global navigation satellite system. By employing two local designed flexibly signals with stepshape modulated symbols, the special pseudo correlation function is able to form a single peak function after crosscorrelations process between the received signal and local signals and nonlinear process. It solves the ambiguity problem caused by multi sidepeaks of the BOC signals′ autocorrelation in effect. According to the real circumstance, performance analysis and simulation comparison in bandlimited condition confirm that the proposed method for typical SinBOC signals provides a much better tracking accuracy than the methods of the DLL or BPSKlike without consideration of ambiguity, and the tracking performance can be affected by the value of the parameter.

    Key words: unambiguous tracking; PCF; single peak; bandlimited; tracking accuracy

收稿日期： 20150422

基金项目： 国家自然科学基金青年科学基金项目（61301144）.

作者简介：   张羽（1994—），男，硕士研究生.*通信联系人.

文章编号： 16726987（2016）03034505； DOI： 10.16351/j.16726987.2016.03.020