| BDS/GPS/Galileo多频观测值精度评估及随机模型精化 |
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| 引用本文： | 赵兴旺,陈健,刘超,刘春阳,樊亚. BDS/GPS/Galileo多频观测值精度评估及随机模型精化[J]. 南京信息工程大学学报, 2022, 14(6): 707-714 |
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| 作者姓名： | 赵兴旺 陈健 刘超 刘春阳 樊亚 |
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| 作者单位： | 安徽理工大学 空间信息与测绘工程学院/矿山采动灾害空天地协同监测与预警安徽普通高校重点实验室/矿区环境与灾害协同监测煤炭行业工程研究中心, 淮南 232001;中国建筑材料工业地质勘查中心贵州总队, 贵阳 551400 |
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| 基金项目： | 安徽省自然科学基金(2108085QD171,2208085MD101);安徽高校自然科学研究重点项目(KJ2021A0443) |
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| 摘 要： | 随机模型的优劣直接影响GNSS精密定位的精度以及可靠性.通过MEGX观测网CUT0、CUT2和CUTA测站连续10 d观测数据，基于短基线单差模型方法求解各系统单差残差的时间序列，并推导出BDS/GPS/Galileo卫星观测值噪声.统计观测值噪声随高度角变化的情况，通过最小二乘拟合方法确定精化的随机模型.结果表明：Galileo的4个频点的伪距观测值精度约20～50 cm, E5频点的精度最高，E1最低，E5a和E5b基本相当；载波相位观测值精度约1～3mm, E5频点的精度明显高于E1、E5a和E5b.BDS载波观测值精度约1～3 mm, B1、B2、B3精度基本相当，其伪距观测值精度约30～50 cm, B1精度最低，B2和B3相差不多.GPS L1伪距观测值精度约63 cm, L2伪距观测值精度约42cm,载波相位精度约3 mm.基于单差模型对各系统观测值进行精度估计，在短基线情况下，BDS/GPS/Galileo载波相位观测值精度基本相当，而Galileo E5伪距观测值精度明显优于其他卫星系统伪距观测值精度.各类型卫星观测值的残差分析可为定位中随机模型的建立提供依据.
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| 关 键 词： | BDS/GPS/Galileo 单差残差 随机模型 精度估计 |
| 收稿时间： | 2022-08-02 |
Precision estimation of the BDS/GPS/Galileo multi-frequency observations and stochastic model refining |
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| ZHAO Xingwang,CHEN Jian,LIU Chao,LIU Chunyang,FAN Ya. Precision estimation of the BDS/GPS/Galileo multi-frequency observations and stochastic model refining[J]. Journal of Nanjing University of Information Science & Technology, 2022, 14(6): 707-714 |
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| Authors: | ZHAO Xingwang CHEN Jian LIU Chao LIU Chunyang FAN Ya |
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| Affiliation: | School of Spatial Information and Geomatics Engineering/Key Laboratory of Aviation-aerospace-ground Cooperative Monitoring and Early Warning of Coal Mining-induced Disasters of Anhui Higher Education Institutes/Coal Industry Engineering Research Center of Mining Area Environmental and Disaster Cooperative Monitoring, Anhui University of Science & Technology, Huainan 232001; Guizhou Branch of China National Geological Exploration Center of Building Materials Industry, Guiyang 551400 |
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| Abstract: | The accuracy of stochastic model directly affects the precision and reliability of GNSS precision positioning.With 10-day observation data of CUT0,CUT2 and CUTA stations in MEGX observation network,the residuals time series of GNSS were solved by single-difference model using short baseline method.According to the statistically observed noises changing with the elevation angle,a refined stochastic model is established via the least-square method.The results show that the range of pseudo-range observation precision lies in 20-50 cm,30-50 cm and 42-63 cm for Galileo,BDS and GPS,respectively;and the carrier phase observation precision falls within the scope of 1-3 mm for Galileo and BDS,and on 3 mm for GPS.For the four frequencies of Galileo,E5 is most accurate in both pseudo-range observation and carrier phase;the accuracies of B1,B2,B3 of BDS are roughly the same;the L2 of GPS is more accurate in pseudo-range observation with precision of 42 cm than L1 of 63 cm,and both L1 and L2 have carrier phase precision of 3 mm.From the above precision estimations based on single-difference model,it can be concluded that in case of short baseline,BDS/GPS/Galileo have roughly same precision in carrier phase observation values,while Galileo E5 outperforms the other satellite systems in pseudo-range observations.Residual analysis of satellite observations provides a basis for the establishment of stochastic models in positioning. |
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| Keywords: | BDS/GPS/Galileo single-difference residuals stochastic model precision estimation |
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