| BDS-3和Galileo组合的RTK定位性能分析 |
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| 引用本文： | 糜晓龙,袁运斌,张宝成.BDS-3和Galileo组合的RTK定位性能分析[J].武汉大学学报(信息科学版),2023,48(1):113-118. |
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| 作者姓名： | 糜晓龙 袁运斌 张宝成 |
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| 作者单位： | 1.中国科学院精密测量科学与技术创新研究院大地测量与地球动力学国家重点实验室, 湖北 武汉, 430071 |
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| 基金项目： | 国家自然科学基金42022025国家自然科学基金41774042中科院科研仪器设备研制项目YJKYYQ20190063国家重点研发计划2016YFB0501900 |
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| 摘 要： | 北斗三号卫星导航系统（BeiDou-3 navigation satellite system, BDS-3）已全面建成并向全球用户提供可靠的定位、导航和授时（positioning, navigation and timing, PNT）服务。为了实现与其他全球卫星导航系统（global navigation satellite system, GNSS）的兼容性和互操作性，BDS-3在BDS-2的基础上调制了B1C和B2a两个新信号，与伽利略系统（Galileo）的E1和E5a实现了频率的复用。系统间偏差（inter-system bias, ISB）对于实现不同GNSS之间的融合处理至关重要，为此提出了基于单差模型的ISB估计与应用算法，并对BDS-3与Galileo重叠频率之间的ISB进行了分析。基于可跟踪BDS-3新信号的几类接收机，揭示了BDS-3和Galileo之间的ISB的特性，在此基础上分析了BDS-3和Galileo组合的实时动态（real-time kinematic, RTK）定位性能。结果表明，基于相同类型的接收机B1C-E1和B2a-E5a之间是不存在ISB的，而基于不同类型的接收机是存在明显的ISB的。此外，BDS-3和Galileo的组合的RTK定位性能相对于单BDS-3和Galileo在模糊度固定成功率和定位精度上都有10%以上的提升。该研究表明，引入ISB的组合RTK定位性能相比于单系统更具优势。
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| 关 键 词： | 北斗三号卫星导航系统 伽利略系统 系统间偏差 实时动态定位 模糊度固定 |
| 收稿时间： | 2022-09-28 |
RTK Positioning Performance Analysis for Combined BDS-3 and Galileo |
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| Affiliation: | 1.State Key Laboratory of Geodesy and Earth' s Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China2.University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Objectives BeiDou-3 navigation satellite system (BDS-3) has been fully completed and provides reliable positioning, navigation, and timing services to global users. In order to achieve compatibility and interoperability with other global navigation satellite systems (GNSS), B1C and B2a signals have been modulated by BDS-3 based on BDS-2, which enable frequency multiplexing with E1 and E5a signals of Galileo. The inter-system biases (ISBs) are important for the fusion processing of different GNSS. Methods This paper proposes an ISB estimation and application model based on the single-differenced observations and analyzes the ISBs between the overlapping frequencies of BDS-3 and Galileo. Based on several receivers of the new trackable BDS-3 signals, the characteristics of ISBs between BDS-3 and Galileo are revealed, and the real-time kinematic (RTK) positioning performance of BDS-3 and Galileo is analyzed. Results The results show that the ISBs of B1C-E1 and B2a-E5a exist in different types of receivers but not in the same type of receivers. In addition, compared with BDS-3-only and Galileo-only, the combination of BDS-3 and Galileo has an improvement of more than 10% in both the success rate of ambiguity resolution and positioning accuracy. Conclusions The multi-constellation RTK positioning performance with the introduction of ISBs is more advantageous than that of a single constellation. |
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