Abstract The precise point positioning (PPP) technique is widely used in time and frequency applications. Because of the real-time service (RTS) project of the International GNSS Service, we can use the PPP technique for real-time clock comparison and monitoring. As a participant in the RTS, the Centre National d’Etudes Spatiales (CNES) implements the PPPWIZARD (Precise Point Positioning with Integer and Zero-difference Ambiguity Resolution Demonstrator) project to validate carrier phase ambiguity resolution. Unlike the Integer-PPP (IPPP) of the CNES, fixing ambiguities in the post-processing mode, the PPPWIZARD operates in the real-time mode, which is also called real-time IPPP (RT-IPPP). This paper focuses on applying the RT-IPPP for real-time clock comparison and monitoring. We review the principle of real-time clock comparison and monitoring, and introduce the methodology of the RT-IPPP technique. The observations of GPS, GLONASS and Galileo were processed for the experiments. Five processing modes were provided in the experiment to analyze the benefits of ambiguity resolution and multi-GNSS. In the clock comparison experiment, the average reduction ratios of standard deviations with respect to the G PPP mode range from 9.7% to 35.0%. In the clock monitoring experiment, G PPP mode can detect clock jumps whose magnitudes are larger than 0.9 ns. The RT-IPPP technique with GRE PPP AR (G) mode allows for the detection of any clock jumps larger than 0.6 ns. For frequency monitoring, G PPP mode allows detection of frequency changes larger than 1.1 × 10−14. When the RT-IPPP technique is applied, monitoring with GRE PPP AR (G) mode can detect frequency changes larger than 6.1 × 10−15.
Real-time clock comparison and monitoring with multi-GNSS precise point positioning: GPS, GLONASS and Galileo
Advances in Space Research ; 65 , 1 ; 560-571
2019-10-21
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Clock comparison and monitoring , Precise point positioning , Multi-GNSS , RT-IPPP , G PPP , processing GPS observation by float PPP , GRE PPP , processing GPS, GLONASS and Galileo observation by float PPP , G PPP AR , processing GPS observation and fixing GPS ambiguity , GRE PPP AR (G) , processing GLONASS and Galileo observation by float PPP and fixing GPS ambiguity , GRE PPP AR (E) , processing GPS and GLONASS observation by float PPP and fixing Galileo ambiguity
Precise point positioning with quad-constellations: GPS, BeiDou, GLONASS and Galileo
Online Contents | 2015
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