| 星载GPS伪距多路径误差与观测噪声对自主定轨的影响分析 |
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| 引用本文： | 龚学文,王甫红.星载GPS伪距多路径误差与观测噪声对自主定轨的影响分析[J].武汉大学学报(信息科学版),2018,43(7):1048-1055. |
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| 作者姓名： | 龚学文 王甫红 |
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| 作者单位： | 1.武汉大学测绘学院, 湖北 武汉, 430079 |
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| 基金项目： | 国家重点研发计划2016YFB0501803 |
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| 摘 要： | 对搭载美国BlackJack接收机的CHAMP/GRACE-A/Jason-2卫星和搭载国产接收机的HY2A/ZY3/TH1卫星的星载GPS数据的伪距多路径误差与观测噪声进行了研究，重点分析了国产接收机伪距多路径误差的变化特性，并研究了多路径误差与观测噪声对星载GPS自主定轨的影响。结果表明:国产接收机的C/A码与P1码伪距观测精度要整体差于美国的BlackJack接收机，而P2码伪距观测精度要整体优于BlackJack接收机；国产接收机P1码伪距受多路径效应影响较大，其多路径误差随高度角减小存在单调递增的变化趋势，其中HY2A、ZY3与TH1卫星的多路径误差最大分别可达3.6 m、1.8 m与0.7 m；这种单调递增变化的多路径误差会导致星载GPS自主定轨位置结果在径向与切向产生系统性偏差。
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| 关 键 词： | 星载GPS数据 多路径误差 自主定轨 系统性偏差 |
| 收稿时间： | 2016-11-20 |
Impact of Multipath Error and Noise of Space-Borne GPS Code Measurements on Real-Time Onboard Orbit Determination |
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| Affiliation: | 1.School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China2.Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, China |
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| Abstract: | This paper studied the multipath error and noise of space-borne GPS code measurements collected from American BlackJack receiver onboard CHAMP, GRACE-A and Jason-2 satellites and the Chinese-built receiver onboard HY2A, ZY3 and TH1 satellites. The emphasis was paid on the variation characteristics of the multipath error and code noise and their impact on real-time onboard orbit determination. The result demonstrated that the C/A and P1 codes observation precision of the Chinese-built receiver was worse than that of American BlackJack receiver, and the P2 code precision of the Chinese-built receiver was superior than that of American BlackJack receiver. The code multipath errors of HY2A, ZY3 and TH1 satellites increased along with the decrease of elevation angles of GPS satellites, and the maximum errors are up to 3.6 m, 1.8 m and 0.7 m, respectively. The orbit determination experiments showed that the monotone increasing multipath error can lead to the systematic bias on the position of real-time onboard orbit results in the radial and tangential directions. |
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