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GPS时分二进制偏移载波调制信号的高精度无偏抗多径算法
引用本文:倪少杰,刘瀛翔,肖志斌,王飞雪.GPS时分二进制偏移载波调制信号的高精度无偏抗多径算法[J].国防科技大学学报,2016,38(5):149-153.
作者姓名:倪少杰  刘瀛翔  肖志斌  王飞雪
作者单位:国防科学技术大学电子科学与工程学院导航研发中心,国防科学技术大学电子科学与工程学院导航研发中心,国防科学技术大学电子科学与工程学院导航研发中心,国防科学技术大学电子科学与工程学院导航研发中心
基金项目:国家自然科学基金资助项目(61403413)
摘    要:二进制偏移载波调制信号将在卫星导航系统中得到广泛应用。全球定位系统的L1C信号导频分量采用了时分二进制偏移载波调制,对此信号直接采用码参考波形算法消除多径时的鉴别曲线收敛点存在偏差,从而影响测距偏差。因此,提出一种时分二进制偏移载波调制信号的高精度无偏抗多径算法。通过时分的方式分别生成针对BOC(1,1)和BOC(6,1)分量的本地闸波,以保证鉴相函数在码相位无偏差时等于0。由于更好地利用了BOC(6,1)信号分量,该技术在实现无偏跟踪的同时,还能提高跟踪精度。

关 键 词:卫星导航  GPS  L1C信号  TMBOC调制  抗多径算法  
收稿时间:2016/1/29 0:00:00

Unbiased Multipath Mitigation Technique for TMBOC signal
NI Shaojie,LIU Yingxiang,XIAO Zhibin and WANG Feixue.Unbiased Multipath Mitigation Technique for TMBOC signal[J].Journal of National University of Defense Technology,2016,38(5):149-153.
Authors:NI Shaojie  LIU Yingxiang  XIAO Zhibin and WANG Feixue
Institution:College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China,College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China,College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China and College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
Abstract:Code Correlation Reference Wave technique (CCRW) is widely used in modern GNSS receivers for its better performance and lower complexity. The pilot channel of GPS L1C signal is modulated with TMBOC modulation. The discrimination curve of TMBOC modulated signal is with bias when received with code correlation reference wave technique. In order to eliminate the tracking bias, an unbiased multipath mitigation technique is proposed. The novel technique generates two categories of local waves for the BOC(1,1) and BOC(6,1) modulated component respectively, its ensuring the discrimination output is zero when there is no code phase bias. The technique obtains unbias tracking while having better accuracy with better utilization of BOC(6,1) signal component.
Keywords:GNSS  GPS L1C signal  TMBOC modulation  multipath mitigation technique
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