宇航学报 ›› 2012, Vol. 33 ›› Issue (11): 1674-1680.doi: 10.3873/j.issn.1000-1328.2012.11.017

• 电子信息 • 上一篇    下一篇

QStrobe:一种高阶BOC卫星导航信号的无模糊多径抑制算法

张锴, 刘瀛翔, 倪少杰, 王飞雪   

  1. 国防科学技术大学电子科学与工程学院卫星导航研发中心,长沙 410073
  • 收稿日期:2011-07-26 修回日期:2011-09-02 出版日期:2012-11-15 发布日期:2012-12-05
  • 作者简介:10001328(2012)11167407
  • 基金资助:
    中国卫星导航年会青年优秀论文资助项目(CSNC2010-QY-20)

QStrobe: An Unambiguous Multipath Mitigation Algorithm for High Order BOC Satellite Navigation Signals

ZHANG Kai, LIU Ying xiang, NI Shao jie, WANG Fei xue   

  1. Satellite Navigation R&D Center, School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
  • Received:2011-07-26 Revised:2011-09-02 Online:2012-11-15 Published:2012-12-05

摘要: 二进制偏移子载波(BOC)技术是为解决有限导航频谱资源复用提出的调制技术,BOC信号相关峰的旁瓣导致传统超前减滞后延迟锁定环(DLL)出现跟踪模糊且不利于多径抑制。提出了一种将QBOC旁瓣消除技术与BPSK信号的Strobe抗多径技术相结合的QStrobe算法解决高子载波调制阶数的BOC信号无模糊抗多径问题。利用本地构造的QBOC信号去除相关峰旁瓣,再利用两组不同间隔超前/滞后码的线性组合构造仅有唯一稳定点,且控制延迟误差响应幅度的码跟踪鉴别曲线,实现无模糊的多径抑制。BOC(15, 2.5)与BOC(14, 2)信号的仿真试验结果表明,QStrobe算法消除了传统超前/滞后DLL的跟踪模糊,比QBOC超前/滞后DLL的6dB衰减多径误差包络面积分别改善51%和70%。

关键词: 卫星导航系统, 二进制偏移子载波, 多径, 无模糊跟踪

Abstract: Binary Offset Carrier (BOC) technique is a modulation technique for solving the multiplexing problem of the finite navigation frequency resources. The side\|peaks of BOC signals lead to tracking ambiguity for traditional Early\|Minus\|Late based Delay Lock Loop (DLL) and are negative for multipath mitigation. A QStrobe algorithm combining the QBOC (Quadrature BOC) side\|peak cancellation technique with the Strobe multipath mitigation technique of BPSK signals is proposed. The local QBOC signal is adopted to remove the side\|peaks, and then two Early\|Minus\|Late discriminators are combined linearly to construct an unambiguous and anti\|multipath discriminator for suppressing the output for delay errors. Simulation for BOC(15,2.5) and BOC(14,2) signals is conducted. The results show that the QStrobe algorithm eliminates the tracking ambiguity of traditional Early\|Minus\|Late discriminator. Compared with QBOC based Early/Late DLL, the 6dB attenuated multipath error envelope area is improved by 51% and 70% respectively.

Key words: Global navigation satellite system, Binary offset carrier, Multipath, Unambiguous tracking

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