Research on code noise and multipath error processing methods of Satellite-based augmented system
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摘要: 星基增强系统(Satellite-Based Augmentation System，SBAS)利用伪距测量校正值实现对导航卫星的差分完好性增强，码噪声和多路径误差处理精度是影响系统服务性能和用户定位精度的重要因素. 本文详细介绍了三种不同的原始伪距码噪声和多路径误差处理方法，包括单频平滑方法、码噪声和多路径改正方法(code noise and multipath correction，CNMC)以及广域增强系统(Wide Area Augmentation System，WAAS)使用的码噪声多路径方法(code noise multipath，CNMP)，并通过正式运行的SBAS数据，验证了不同的码噪声和多路径误差方法对于用户定位精度的影响. 结果表明：CNMP能够有效消除SBAS服务性能评估中的原始伪距码噪声和多路径误差影响，相较于CNMC方法，全球参考系统(wide-area reference station，WRS)站点95%水平定位精度提升0.2 m，95%垂直定位精度提升0.47 m.
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关键词:
- 星基增强系统(SBAS) /
- 码噪声和多路径误差 /
- 载波相位平滑 /
- 码噪声和多路径改正方法(CNMC) /
- 码噪声多路径方法(CNMP)
Abstract: The Satellite Based Augmentation System (SBAS) uses the pseudorange measurement corrections to enhance the integrity of navigation satellites, the code noise and multipath error processing accuracy are important factors affecting the service performance of the system and the accuracy of user positioning. In this paper, three different methods for dealing with raw pseudorange code noise and multipath error are introduced, including the single-frequency smoothing method, the code noise and multi-path correction (CNMC), and the code noise multipath method (CNMP) used by the Wide Area Augmentation System (WAAS). Through the data of the satellite-based augmentation system in operation, the influence of different code noise multipath error methods on the user’s positioning accuracy is verified. The results show that CNMP can effectively eliminate the influence of code noise and multipath error in the service performance evaluation of satellite-based augmentation system, and the horizontal accuracy of 95% is increased by 0.2 m, and the vertical positioning accuracy of 95% is increased by 0.47 m.-
Key words:
- SBAS /
- code noise and multipath error /
- carrier phase smoothing /
- CNMC /
- CNMP
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表 1 WRS站点水平定位精度对比表
WRS站 HPE(95%)/m 官网 CNMP 单频平滑 CNMC wbet 0.63 0.67 0.70 0.74 wbil 0.53 0.68 0.75 0.96 wcdb 0.63 0.74 0.72 0.76 wfai 0.60 1.06 1.07 1.12 wjnu 0.70 1.09 1.11 1.20 wmmx 1.12 1.12 1.13 1.15 wmpr 1.01 0.97 1.07 1.46 wyyr 2.03 1.97 2.06 2.01 wzla 0.88 0.77 1.01 1.16 wzlc 0.52 0.58 0.83 1.10 均值 0.87 0.97 1.05 1.17 
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表 2 WRS站点垂直定位精度对比表
WRS站 VPE(95%)/m 官网 CNMP 单频平滑 CNMC wbet 1.50 1.60 1.69 1.74 wbil 0.72 0.83 1.19 1.65 wcdb 1.55 1.83 2.00 2.00 wfai 1.60 1.89 2.06 2.15 wjnu 1.16 1.49 1.51 1.82 wmmx 2.24 2.40 2.62 2.80 wmpr 2.58 2.56 2.55 3.10 wyyr 1.67 1.95 2.07 2.08 wzla 1.46 1.53 1.86 2.44 wzlc 0.80 0.87 1.30 1.93 均值 1.53 1.70 1.89 2.17
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表 3 IGS站点水平定位精度统计表
IGS站点 HPE(95%)/m CNMP 单频平滑 CNMC gcgo 0.93 0.98 1.11 gode 0.52 0.58 0.65 sgpo 0.59 0.63 0.87 均值 0.68 0.73 0.88
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表 4 IGS站点垂直定位精度统计表
IGS站点 VPE(95%)/m CNMP 单频平滑 CNMC gcgo 1.39 1.52 1.86 gode 1.22 1.20 1.37 sgpo 1.04 1.01 1.48 均值 1.22 1.24 1.57
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