Satellite availability and positioning performance of uncombined precise point positioning using BeiDou-2 and BeiDou-3 multi-frequency signals
Satellite availability and positioning performance of uncombined precise point positioning using BeiDou-2 and BeiDou-3 multi-frequency signals
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北斗二号和北斗三号多频信号非组合精密单点定位的卫星可用性和定位性能
DOI：
10.1016/j.asr.2020.11.011
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发表时间：
2021-01-23
影响因子：
2.6
通讯作者：
Li, Jiancheng
中科院分区：
文献类型：
--
作者：
Cao, Xinyun;Shen, Fei;Li, Jiancheng
为了实现从区域北斗导航卫星系统（BDS-2）到全球北斗导航卫星系统（BDS-3）的平稳过渡，北斗导航卫星系统（BDS-2）和北斗导航卫星系统（BDS-3）的集成对于为全球用户提供连续、稳定和可靠的定位、导航和授时（PNT）服务至关重要。利用154个全球分布式多GNSS（Global Navigation Satellite System，全球导航卫星系统）实验站，在30天时间内分析了当前BDS-2和BDS-3星座下的卫星可用性和非组合精密单点定位（Uncombined Precise Point Positioning，UC-PPP）性能。我们集中讨论了三个问题：BDS-3接收机跟踪能力的影响、不同区域之间的定位性能以及多频观测的好处。结果表明，引入均匀分布的BDS-3中轨卫星后，由于BDS-2卫星能见度差而产生的椭圆区消失。当BDS-3与BDS-2集成时，位置精度衰减（PDOP）小于2的区域可以扩展到75 ° S-75 ° N和30 ° E-150 ° W。BDS-3和BDS-2/BDS-3UC-PPP的定位性能受到BDS-3信号接收机跟踪能力的严重影响。当观测站跟踪的BDS-3卫星的最大伪随机噪声序列（PRN）在30或37以内时，BDS-2和BDS-3的融合可使静态UC-PPP的定位精度分别提高22.94%和8.27%。此外，BDS-2和BDS-3的集成在亚太地区取得了最大的改进，特别是对于运动学UC-PPP或BDS-3的接收机跟踪能力差。与多频BDS-2 UC-PPP类似，多频信号对BDS 3或BDS-2/BDS-3 UC-PPP的好处也不是至关重要的。BDS-2/BDS-3多频UC-PPP在静态和动态模式下的三维定位精度分别为2.24 cm和5.39 cm，对应的收敛时间分别为49.62 min和73.80 min。与BDS-2相比，BDS-2/BDS-3联合UC-PPP的定位精度和收敛时间均提高约50%以上，这表明BDS-3具有与其他全球导航卫星系统一样提供高质量PNT服务的巨大潜力。(C)2020年空间研委会。由爱思唯尔有限公司出版。保留所有权利。
To realize the smooth transition from regional BeiDou Navigation Satellite System (BDS-2) to the global one (BDS-3), the integration of BDS-2 and BDS-3 is important for providing continuous, stable and reliable positioning, navigation and timing (PNT) services for global users. This work used 154 globally distributed multi-GNSS (Global Navigation Satellite System) experiment stations spanning 30 days to analyze the satellite availability and positioning performance of uncombined precise point positioning (UC-PPP) under current BDS-2 and BDS-3 constellations. We focused on three issues: the influence of BDS-3 receiver tracking abilities, the positioning performance among different areas, and the benefit of multi-frequency observations. The results show that the elliptical zone caused by poor BDS-2 satellite visibility is disappeared when the evenly distributed BDS-3 medium earth orbit satellites are introduced. When BDS-3 are integrated with BDS-2, the area with the Position Dilution of Precision (PDOP) less than 2 can be expanded to 75 degrees S-75 degrees N and 30 degrees E-150 degrees W. The positioning performance of BDS-3 and BDS-2/BDS-3 UC-PPP are seriously affected by the receiver tracking abilities of BDS-3 signals. When the maximum pseudo-random noise sequences (PRNs) of BDS-3 satellites tracked by stations are within 30 or 37, the positioning accuracy of static UC-PPP can be improved by 22.94% or 8.27% due to the integration of BDS-2 and BDS-3. Besides, the most improvement of BDS-2 and BDS-3 integration is achieved in Asia-Pacific regions, especially for the kinematic UC-PPP or the poor receiver tracking abilities of BDS-3. Similar to the multi-frequency BDS-2 UC-PPP, the benefit of multi-frequency signals for BDS3 or BDS-2/BDS-3 UC-PPP is also non-vital. The three-dimensional positioning accuracy of BDS-2/BDS-3 multi-frequency UC-PPP in static mode and kinematic mode are 2.24 cm and 5.39 cm, while the corresponding convergence time are 49.62 min and 73.80 min, respectively. Compared with BDS-2, both the positioning accuracy and the convergence time of BDS-2/BDS-3 joint UC-PPP are improved by approximately over 50%, which indicates that BDS-3 has a great potential to provide high-quality PNT services as other global navigation satellite systems. (C) 2020 COSPAR. Published by Elsevier Ltd. All rights reserved.