三家北斗地基增强系统的高精度定位服务性能对比分析

北斗地基增强系统是推广高精度“北斗+”应用的重要基础设施。本文首次研究千寻位置、六分科技及中国移动3家覆盖全国的北斗地基增强系统的定位服务性能，通过对2021-07-21~22采集的2次8~9 h观测数据进行分析，得到以下结论： 1） 千寻位置和中国移动的官方推荐挂载点支持BDS-2三频信号和BDS-3双频信号（B1I、B3I），六分科技支持BDS-2和BDS-3双频信号（B1I、B3I）； 2） 3家北斗地基增强系统都能提供100%的北斗数据完整率； 3） 静态基线结果表明，3家北斗地基增强系统虚拟基站组成的闭合环相对误差均小于2×10^-6； 4） 单历元RTK解算结果表明，3家北斗地基增强系统均能够提供水平向优于3 mm、垂直向优于9 mm的内符合精度，但不同北斗地基增强系统之间存在cm~dm级的定位结果偏差，因此不建议在RTK作业时使用不同的北斗地基增强系统。

High-Precision Positioning Service Performance Analysis of Three BDS Ground-Based Augmentation Systems

BDS Ground-based Augmentation System(GBAS) is an important infrastructure to promote high-precision BDS+ applications. For the first time, this paper studies the positioning performance of three nationwide GBASs: Qianxun, Sixents Technology and China Mobile. Through the analysis of two 8-9-hour observation sessions on July 21 and 22, 2021, we infer: 1) Both Qianxun SI and China Mobile support BDS-2 triple-frequency signals and BDS-3 dual-frequency signals(B1I and B3I), whereas Sixents Technology supports BDS-2 and BDS-3 dual-frequency signals(B1I and B3I); 2) All three BDS GBASs can provide 100% data availability; 3) Static baseline results show a <2×10^-6 relative error of the closed loop with the three virtual base stations; 4) Single-epoch RTK results show that all three BDS GBAS can provide less than 3/9 mm horizontal/vertical precision. However, cm-dm level positioning bias exists among different BDS GBASs. As the result, it is not recommended to use inconsistent BDS GBASs in a single RTK task.