王西龙, 许小龙, 赵齐乐. 北斗三号系统信号质量分析及轨道精度验证[J]. 武汉大学学报 ( 信息科学版), 2023, 48(4): 611-619. DOI: 10.13203/j.whugis20200577
引用本文: 王西龙, 许小龙, 赵齐乐. 北斗三号系统信号质量分析及轨道精度验证[J]. 武汉大学学报 ( 信息科学版), 2023, 48(4): 611-619. DOI: 10.13203/j.whugis20200577
WANG Xilong, XU Xiaolong, ZHAO Qile. Signal Quality Analysis and Orbit Accuracy Verification of BDS-3[J]. Geomatics and Information Science of Wuhan University, 2023, 48(4): 611-619. DOI: 10.13203/j.whugis20200577
Citation: WANG Xilong, XU Xiaolong, ZHAO Qile. Signal Quality Analysis and Orbit Accuracy Verification of BDS-3[J]. Geomatics and Information Science of Wuhan University, 2023, 48(4): 611-619. DOI: 10.13203/j.whugis20200577

北斗三号系统信号质量分析及轨道精度验证

Signal Quality Analysis and Orbit Accuracy Verification of BDS-3

  • 摘要: 北斗三号卫星导航系统(BeiDou-3 navigation satellite system,BDS-3)的信号体制经过重新设计,提供B1I、B3I、B1C、B2a以及B2b 5个频点的公开服务信号。从伪距多路径、信噪比、无几何无电离层相位组合(geometry-free ionosphere-free phase combination, GFIFP)观测值特性等方面,对BDS-3卫星公开服务信号的观测数据质量进行分析评估。结果表明,BDS-3卫星信号的多路径噪声水平优于北斗二号系统卫星,且未发现与高度角相关的系统偏差,B1C受多路径及噪声的影响更为显著;不同信号组合的GFIFP序列都呈现出与卫星相关的周期性系统误差,峰值约为2 cm。对BDS-3卫星采用“一步法”精密定轨,分别采用B1I&B3I与B1C&B2a的双频无电离层组合,使用轨道边界不连续性以及卫星激光测距进行轨道精度检核,结果表明,在可用观测数少于B1I&B3I的情况下,B1C&B2a解算的轨道精度达到与B1I&B3I相当的水平,轨道径向的内符合精度分别为6.1 cm、6.6 cm。

     

    Abstract:
      Objectives  On July 31, 2020, China's BeiDou-3 satellite navigation system (BDS-3), which operates independently, has been fully completed and officially opened for service. The signal system of BDS-3 has been redesigned to provide public service signals of five frequencies: B1I, B3I, B1C, B2a and B2b.
      Methods  Based on the observations of international global navigation system monitoring and assessment service and multi-GNSS experiment (MGEX) tracking stations, this paper analyzes the characteristics of pseudoranges multipath error, signal to noise ratio, geometry-free ionosphere-free phase(GFIFP) combined observations of the new signal system, as well as the precise orbit determination (POD) performance evaluation of BDS-3 satellites.
      Results and Conclusions  The results show that the multipath noise level of BDS-3 satellites signal is better than that of BeiDou-2 navigation satellite system satellites, and there is no systematic deviation related to altitude angle, B1C is more significantly affected by multipath and noise. The GFIFP sequences of different signal combinations of BDS-3 satellites show periodic systematic error related to satellite, and the peak value is about 2 cm. For BDS-3 satellites, the one-step POD method is used. The two frequencies ionospheric free combination of B1I&B3I and B1C&B2a is adopted respectively. The orbit boundary discontinuity and satellite laser ranging carried out an orbit accuracy check, and the results show that when the number of available observations is less than B1I&B3I, the orbit accuracy of B1C&B2a is equivalent to that of B1I&B3I, and the radial internal coincidence accuracy is 6.1 cm and 6.6 cm respectively.

     

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