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Quality monitoring of real-time GNSS precise positioning service system

Geo-Spatial Information Science 2023年第1期26卷 1-15页

作者： Run Ji Xinyuan Jiang Xinghan Chen Huizhong Zhu Maorong Ge frank neitzel Institute of Geodesy and Geoinformation Science Technische Universität BerlinBerlinGermany German Research Center for Geosciences(GFZ) PotsdamGermany School of Geomatics Liaoning Technical University(LNTU)Fuxin 123000China

The Real-Time Global Navigation Satellite System(GNSS)Precise Positioning Service(RTPPS)is recognized as the most promising system by providing precise satellite orbit and clock correc-tions for users to achieve centimeter-level positioning with a stand-alone receiver in *** the products are available with high accuracy almost all the time,they may occasionally suffer from unexpected significant biases,which consequently degrades the positioning ***,quality monitoring at the system-level has become more and more crucial for providing a reliable GNSS *** this paper,we propose a method for the monitoring of realtime satellite orbit and clock products using a monitoring station network based on the Quality Control(QC)*** satellites with possible biases are first detected based on the outliers identified by Precise Point Positioning(PPP)in the monitoring station ***,the corresponding orbit and clock parameters with temporal constraints are introduced and esti-mated through the sequential Least Square(LS)estimator and the corresponding Instantaneous User Range Errors(IUREs)can be determined.A quality indicator is calculated based on the IUREs in the monitoring network and compared with a pre-defined *** quality monitoring method is experimentally evaluated by monitoring the real-time orbit and clock products generated by GeoForschungsZentrum(GFZ),*** results confirm that the problematic satellites can be detected accurately and effectively with missed detection rate 4×10^(-6) and false alarm rate 1:2×10^(-5).Considering the quality alarms,the PPP results in terms of RMS of positioning differences with respect to the International GNSS Service(IGS)weekly solution in the north,east and up directions can be improved by 12%,10%and 27%,respectively.

关键词： Global Navigation Satellite System(GNSS) real-time precise positioning quality monitoring precise point positioning satellite product bias

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