Validation and Assessment of Multi-GNSS Real-Time Precise Point Positioning in Simulated Kinematic Mode Using IGS Real-Time Service
Validation and Assessment of Multi-GNSS Real-Time Precise Point Positioning in Simulated Kinematic Mode Using IGS Real-Time Service
复制标题
DOI：
10.3390/rs10020337
复制
发表时间：
2018-02-01
期刊：
影响因子：
5
通讯作者：
Yuan, Hong
中科院分区：
文献类型：
--
作者：
Wang, Liang;Li, Zishen;Yuan, Hong
精密单点定位(PPP)是一种基于全球导航卫星系统(GNSS)的高精度应用技术。近年来，随着多GNSS的发展，多GNSS联合PPP成为研究的热点。同时，通过国际全球导航卫星系统服务机构(IGS)的实时服务(RTS)的运作，为广播星历提供卫星轨道和时钟修正，有可能获得卫星轨道和时钟的实时精密产品，并进行实时PPP。在这一贡献中，将CLK93产品的实时多全球导航卫星系统轨道和时钟改正用于实时多全球导航卫星系统PPP处理，并研究了其轨道和时钟质量，首先进行了为期七天的实验，将其与GFZ的最终多全球导航卫星系统精密产品GBM‘进行比较。然后，对MGEX网络中的三个站点进行了为期两周的实时PPP处理实验，以评估实时PPP在模拟运动学模式下的收敛性能。实验结果表明，在精度为20 cm的情况下，实时PPP算法的收敛时间小于15min。最后，利用12个全球分布的IGS/MGEX站1个月的实时数据流对实时多GNSS PPP的定位精度进行了评估和验证。结果表明，不同站点实时PPP的动态定位精度分别为水平方向3.0~4.0 cm，三维方向5.0~7.0 cm。
Precise Point Positioning (PPP) is a popular technology for precise applications based on the Global Navigation Satellite System (GNSS). Multi-GNSS combined PPP has become a hot topic in recent years with the development of multiple GNSSs. Meanwhile, with the operation of the real-time service (RTS) of the International GNSS Service (IGS) agency that provides satellite orbit and clock corrections to broadcast ephemeris, it is possible to obtain the real-time precise products of satellite orbits and clocks and to conduct real-time PPP. In this contribution, the real-time multi-GNSS orbit and clock corrections of the CLK93 product are applied for real-time multi-GNSS PPP processing, and its orbit and clock qualities are investigated, first with a seven-day experiment by comparing them with the final multi-GNSS precise product GBM' from GFZ. Then, an experiment involving real-time PPP processing for three stations in the Multi-GNSS Experiment (MGEX) network with a testing period of two weeks is conducted in order to evaluate the convergence performance of real-time PPP in a simulated kinematic mode. The experimental result shows that real-time PPP can achieve a convergence performance of less than 15 min for an accuracy level of 20 cm. Finally, the real-time data streams from 12 globally distributed IGS/MGEX stations for one month are used to assess and validate the positioning accuracy of real-time multi-GNSS PPP. The results show that the simulated kinematic positioning accuracy achieved by real-time PPP on different stations is about 3.0 to 4.0 cm for the horizontal direction and 5.0 to 7.0 cm for the three-dimensional (3D) direction.