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北斗全球卫星导航系统B1C信号采用正交复用二进制偏移载波(QMBOC)调制,具有更高的跟踪精度。但在非理想信道传输过程中,QMBOC信号多峰特性存在跟踪模糊的问题,同时,多径效应引起的信号畸变会影响定位精度。基于QMBOC信号研究了Bump-Jump、双重估计(DET)跟踪算法,基于窄相关器、高分辨率相关器(HRC)机理推导了多径误差表达式,提出了HRC与DET组合的无模糊多径抑制算法,对比分析了不同组合算法在多径干扰下的跟踪精度,仿真了不同多径误差表达式参数变化下的多径误差包络。研究结果表明,HRC鉴相器与DET组合方法比窄相关技术抗多径能力改善了39%,DET与HRC组合方法对QMBOC信号跟踪稳定性最优,实现了QMBOC信号无模糊多径抑制跟踪。
Abstract：The B1 C signal of BeiDou global navigation satellite system used the quadrature multiplexed BOC(QMBOC) modulation, which with higher tracking accuracy. However, in the transmission process of non-ideal channel, the multiple side-peaks caused by QMBOC modulation will cause the ambiguous tracking. In addition, the signal distortion caused by multipath effect will influence the positioning accuracy. This paper studied the tracking algorithms of Bump-Jump and dual estimate technology(DET) based on the QMBOC signal. In addition, the mechanisms of narrow correlator and high resolution correlator(HRC) were also studied, the expressions for multipath error of narrow correlator and HRC discriminator were deduced. Finally, we proposed an unambiguous multipath mitigation algorithm which combined with HRC and DET for QMBOC signal. Based on this algorithm, the tracking accuracy of different combinations was compared and analyzed, and the multipath error envelope with different multipath error expression parameters was simulated. The results show that the multipath mitigation performance based on the combination of DET and HRC discriminator is improved by 39% compared with the narrow correlator technology. What's more, the combination of DET and HRC has much better tracking stability, and it realizes the unambiguous multipath mitigation tracking for QMBOC signal.
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基本信息:
DOI：10.13875/j.issn.1674-0637.2020-02-0153-16
中图分类号:TN967.1;TP273
引用信息:
[1]王森,王雪,霍翔,等.北斗系统QMBOC信号无模糊多径抑制算法研究[J].时间频率学报,2020,43(02):153-168.DOI:10.13875/j.issn.1674-0637.2020-02-0153-16.
基金信息:
中国科学院青年创新促进会人才资助项目
2020-07-02
2020-07-02
2020-07-02