0000000000000000PDF全文下载:2016030345
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SinBOC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(BPSKlike)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 stepshape modulated symbols, the special pseudo correlation function is able to form a single peak function after crosscorrelations process between the received signal and local signals and nonlinear process. It solves the ambiguity problem caused by multi sidepeaks of the BOC signals′ autocorrelation in effect. According to the real circumstance, performance analysis and simulation comparison in bandlimited condition confirm that the proposed method for typical SinBOC signals provides a much better tracking accuracy than the methods of the DLL or BPSKlike without consideration of ambiguity, and the tracking performance can be affected by the value of the parameter.
Key words: unambiguous tracking; PCF; single peak; bandlimited; tracking accuracy
收稿日期: 20150422
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: 16726987(2016)03034505; DOI: 10.16351/j.16726987.2016.03.020