赵齐乐, 许小龙, 马宏阳, 刘经南. GNSS实时精密轨道快速计算方法及服务[J]. 武汉大学学报 ( 信息科学版), 2018, 43(12): 2157-2166. DOI: 10.13203/j.whugis20180374
引用本文: 赵齐乐, 许小龙, 马宏阳, 刘经南. GNSS实时精密轨道快速计算方法及服务[J]. 武汉大学学报 ( 信息科学版), 2018, 43(12): 2157-2166. DOI: 10.13203/j.whugis20180374
ZHAO Qile, XU Xiaolong, MA Hongyang, LIU Jingnan. Real-Time Precise Orbit Determination of BDS/GNSS: Method and Service[J]. Geomatics and Information Science of Wuhan University, 2018, 43(12): 2157-2166. DOI: 10.13203/j.whugis20180374
Citation: ZHAO Qile, XU Xiaolong, MA Hongyang, LIU Jingnan. Real-Time Precise Orbit Determination of BDS/GNSS: Method and Service[J]. Geomatics and Information Science of Wuhan University, 2018, 43(12): 2157-2166. DOI: 10.13203/j.whugis20180374

GNSS实时精密轨道快速计算方法及服务

Real-Time Precise Orbit Determination of BDS/GNSS: Method and Service

  • 摘要: 多系统全球导航卫星系统(Global Navigation Satellite System,GNSS)精密轨道确定及其预报是实现高精度实时精密定位的前提。针对多GNSS系统超快速轨道解算时效性及轨道预报精度随时间下降的问题,提出一种基于分块递推最小二乘配置方法,该方法通过对动力学和几何学待估参数松弛、连接以及轨道状态参数转移递推,能够同时兼容事后及实时滤波定轨方法。该方法能够有效地提高多GNSS系统轨道解算效率,缩短实时轨道更新时间。基于全球实测数据验证了该方法的可靠性和有效性,轨道精度优于国际GNSS服务组织发布的GPS超快速轨道及德国地学研究中心发布的超快速轨道,实验结果表明,采用该方法,GPS/GLONASS/Galileo/BDS四系统120个地面测站精密定轨可以实现1 h更新,延迟30 min发布,统计GPS/GLONASS/Galileo/BDS实时轨道可用部分3D均方根分别为2.8 cm、8.5 cm、5.0 cm及11.5 cm(IGSO/MEO)。目前,1 h更新多GNSS系统轨道及实时产品服务系统已业务化发布,较之前发布的3 h更新及6 h更新轨道分别有20%~40%的精度提升。

     

    Abstract: Multi-GNSS (Global Navigation Satellite System) precise orbit determination and prediction is the prerequisite of high-precision real-time precise positioning. To improve the efficiency of ultra-rapid orbit solution and prediction precision in multi-GNSS, this paper proposes a collocation method based on block recursive least squares. The proposed method can combine post estimation with real-time filtering orbit determination by ① relaxing and connecting kinetics and geometry parameters, and ② transferring and recurring orbit status parameters. In addition, this method increases the efficiency of GNSS orbit solution and shortens the orbit updating time. Furthermore, experimental result verifies the reliability and effectiveness of our proposed method. Our orbit precisions are superior to the precisions of ultra-rapid GPS orbits provided by international GNSS service (IGS) and German Research Centre for Geosciences. The results show that, for quad-constellation (GPS/GLONASS/Galileo/BDS) precise orbit determination by 120 ground observation stations, our method is able to realize one-hour updating and provides service with 30 minutes delay. The 3D root mean squares of available parts in GPS/GLONASS/Galileo/BDS real-time orbit are 2.8 cm, 8.5 cm, 5.0 cm and 11.5 cm(IGSO/MEO), respectively. At present, one-hour updating for multi-GNSS orbits and real-time service system have been provided, and compared with previous three-hour and six-hour updating orbit, the precision has been improved by 20% to 40%.

     

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