2010•Wuhan Daxue xuebao. Xinxi kexue banRequires access

GPS-GLONASS and Their Combined Precise Point Positioning

Jiming Guo

Abstract

The GPS/GLONASS combined PPP(Precise Point Positioning)'s function and random models are given,and the key techniques for GPS/GLONASS combined PPP are studied.Based on least squares filter,the GPS/GLONASS combined PPP algorithm and software are realized.The actual GPSGLONASS observation datasets are processed using self-developed software,and the results show that: ① Compared to GPS PPP,both the convergence time and the accuracy of GPS/GLONASS combined PPP are improved.② There are less than 5 GLONASS satellites in 21.9% of a whole day's UNB3 data,which can not be used to complete GLONASS PPP.③ The system time difference between GPS and GLONASS is within 7.2 ns.

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Key concepts: GLONASS, Global Positioning System, Computer science, Real Time Kinematic, Precise Point Positioning, Geodesy, Remote sensing, Real-time computing