Quality Analysis of the Range Measurement Signals of Test Satellites in BeiDou Global System
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摘要: 目前，北斗全球卫星导航系统有5颗试验卫星发射试验信号。试验卫星数据质量分析是北斗全球系统信号体制验证的重要内容。基于单测站北斗试验卫星观测数据，采用伪距相位差组合和伪距多径组合方法，初步分析了试验卫星民用信号以及Bs频点信号伪距测量噪声和多径误差。结果表明，倾斜同步轨道卫星伪距测量精度优于中轨道卫星；在各导航信号中，B2a+b信号伪距测量精度最高，具有最优的抗多径性能；B1C信号伪距测量精度最低，抗多径性能最差；Bs信号伪距测量精度较差，但优于B1C信号，且其伪距多径存在一个与高度角相关的系统误差，在高度角最大时可达0.5 m。Abstract: Currently, there are five testing satellites of BeiDou Global Satellite Navigation System broadcasting new signals. Quality analysis of testing satellite observations is a significant content for the verification of the new signal system. Based on single station measurement of BeiDou testing satellites, the code minus phase combination (CC) and multipath combination (MP) are employed to analyze the code noise and multipath errors of civil signals and Bs signal of the test satellites. The result shows that the pseudorange measurement accuracy of inclined geosynchronous satellite orbit (IGSO) satellite is better than that of the medium earth orbit (MEO) satellite; B2a+b signal has the highest pseudorange measurement accuracy as well as the best anti-multipath performance, while the B1C signal performs the worst in both aspects; the pseudorange measurement accuracy of Bs signal is rela-tively poor, yet better than that of the B1C signal and a systematic error related to elevation exists in the code multipath series of Bs signal with its maximum value up to 0.5 meter.
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Keywords:
- BeiDou Global Satellite Navigation System /
- test satellites /
- IGSO /
- MEO /
- pseudorange noise /
- multipath error
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图 3 I2-S和M1-S卫星全球系统信号MP时间序列
Figure 3. MP Time Series of New Signals of I2-S and M1-S Satellites
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图 4 二号一期和试验卫星IGSO卫星B1I和B3I信号MP时间序列对比图
Figure 4. MP Time Series of B1I and B3I Signals of Testing and Compass II IGSO Satellites
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图 5 二号一期和试验卫星MEO卫星B1I和B3I信号MP时间序列对比图
Figure 5. MP Time Series of B1I and B3I Signals of Testing and Compass II MEO Satellites
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图 6 Bs频点伪距多径误差随高度角变化情况
Figure 6. Code Multipath Error as a Function of Elevation Angle of Bs Signal
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图 7 伪距多径RMS值随高度角变化情况
Figure 7. RMS of Code Multipath and Noise as a Function of Elevation Angle
表 1 本文所分析试验卫星信号
Table 1 Signals of Test Satellites Analyzed in This Contribution
卫星 卫星类型 信号 I1-S IGSO B1I、B3I I2-S IGSO B1I、B1C、B2a、B2b、B2a+b、B3I、Bs M1-S MEO B1I、B1C、B2a、B2b、B2a+b、B3I、Bs M2-S MEO B1I、B1C、B2a、B2b、B2a+b、B3I 
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表 2 各试验卫星伪距噪声RMS/ m
Table 2 RMS of Code Noise of Test Satellites/ m
卫星 B1 B2 B3 Bs B1I B1C B2a B2b B2a+b B3I B3C I1-S 0.10 0.06 I2-S 0.10 0.18 0.11 0.06 0.03 0.05 0.12 M1-S 0.23 0.28 0.20 0.19 0.07 0.20 0.26 M2-S 0.23 0.29 0.22 0.19 0.07 0.21
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