| BDS-2/BDS-3伪距单点定位精度分析 |
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| 引用本文： | 方欣颀,范磊.BDS-2/BDS-3伪距单点定位精度分析[J].全球定位系统,2020,45(1):19-25. |
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| 作者姓名： | 方欣颀 范磊 |
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| 作者单位： | 北京航空航天大学电子信息工程学院,北京100191;卫星导航与移动通信融合技术工信部重点实验室,北京100191;北京航空航天大学电子信息工程学院,北京100191;卫星导航与移动通信融合技术工信部重点实验室,北京100191 |
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| 基金项目： | 中国卫星导航系统重大专项(GFZX030302030204)。 |
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| 摘 要： | 北斗三号(BDS-3)基本系统于2018年底开始提供全球服务．通过处理37个全球GNSS服务组织(IGS)多模实验跟踪网(MGEX)观测站90天北斗数据,评估了北斗二号(BDS-2)和BDS-3在全球范围内的可见卫星数、几何精度衰减因子(GDOP)和单频伪距单点定位精度,分析了BDS-2／BDS-3组合对BDS-2、BDS-3单系统空间几何构型、伪距单点定位(SPP)精度的改善程度．结果表明,BDS-3的空间几何构型较BDS-2有明显的提升,定位精度在东方向、北方向和高程方向分别为1.490、2.610、5.238 m(RMS),相较于BDS-2分别提高了58％、1％、24％．BDS-2／BDS-3组合在东方向、北方向和高程方向分别为1.45、2.36、4.90 m(RMS),较BDS-2与BDS-3单系统分别提高了59％、11％、29％,以及3％、10％、6％．并且BDS-2／BDS-3组合明显削弱了BDS-2定位精度与地理经度相关的边缘效应.
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| 关 键 词： | 北斗二号 北斗三号 单频伪距单点定位 GDOP 定位精度 |
Accuracy analysis of BDS-2/BDS-3 standard point positioning |
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| FANG Xinqi,FAN Lei.Accuracy analysis of BDS-2/BDS-3 standard point positioning[J].Gnss World of China,2020,45(1):19-25. |
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| Authors: | FANG Xinqi FAN Lei |
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| Affiliation: | 1.School of Electronic Information Engineering, Beihang University, Beijing 100191, China2.Laboratory of Navigation and Communication Fusion Technology, Ministry of Industry and Information Technology, Beijing 100191, China |
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| Abstract: | The third-generation of Chinese BeiDou Satellite System(BDS-3) has been providing global service since the end of 2018. In order to evaluate the accuracy of BDS-2 and BDS-3 standard point positioning(SPP) as well as visible satellites and GDOP, 90 days of BDS-2 and BDS-3 data collected from 37 globally distributed International GNSS Service(IGS) Multi-GNSS Experiment network(MGEX) stations was used to perform data analysis. Results show that: 1) The geometry of BDS-3 is significantly improved when compared with that of BDS-2 by analyzing the visible satellites and GDOP. 2) The RMS of BDS-3 SPP error is 1.490, 2.610, 5.238 m in the east, north and up directions, which is improved by 58%, 1%, and 24% respectively when compared with that of BDS-2. 3) The RMS of combined BDS-2/BDS-3 SPP error is 1.45, 2.36, 4.90 m, which is improved by 59%, 11% 29% when compared with the BDS-2 results. 4) The RMS of combined BDS-2/BDS-3 SPP error is improved by 3%, 10%, 6% when compared with the BDS-3 results. We also find that the combination of BDS-2 and BDS-3 weakens the marginal effect of BDS-2 SPP which is related to the geographical longitude. |
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| Keywords: | BDS-2 BDS-3 standard point positioning GDOP accuracy |
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