Multi-GNSS Processing Combining GPS, GLONASS, BDS and GALILEO Observations
Coexistence and development of four kinds of Global Satellite Navigation System, GPS, GLONASS, BDS, and GALILEO have initially established. In order to benefit from multi-GNSS applications, including increase in usable SVs, signals and frequencies, increa
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Multi-GNSS Processing Combining GPS, GLONASS, BDS and GALILEO Observations Hongzheng Cui, Geshi Tang, Songjie Hu, Baiyan Song, Huicui Liu, Jing Sun, Peng Zhang, Cuilan Li, Maorong Ge and Chao Han
Abstract Coexistence and development of four kinds of Global Satellite Navigation System, GPS, GLONASS, BDS, and GALILEO have initially established. In order to benefit from multi-GNSS applications, including increase in usable SVs, signals and frequencies, increase in availability and coverage, more robust and reliable services, and so on, firstly we need to obtain the precise multi-GNSS orbit and clock in a unified space and time frame. Based on the knowledge of the EPOS and EPOS-RT (Earth Parameter and Orbit determination System in Real-Time) software package, Beijing Aerospace Control Center (BACC) has been working on his own software package for multi-GNSS data processing. This paper firstly introduces the multi-GNSS processing strategies in detail, and adopts additional inter system biases parameter (ISB) except the normal IGS and GFZ observation model and dynamic model. On the basis of above strategies and the observation data from a network of multi-GNSS capable receivers from the IGS Multi-GNSS EXperiment (MGEX) and a regional BDS station network operated by China, the experiments and simulation are carried out. The results are validated against products from other institutes and by overlap comparison. The impact on orbit and clock precision by combined processing against single system processing is investigated and the improvement on precise point positioning (PPP) is also evaluated.
Keywords Multi-GNSS Combined data processing Inter system biases (ISB) Orbit overlap Precise point positioning (PPP)
H. Cui (&) G. Tang S. Hu B. Song H. Liu J. Sun P. Zhang C. Li Flight Dynamics Laboratory, Beijing Aerospace Control Center, Beijing 100094, China e-mail: [email protected] H. Cui C. Han School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China M. Ge German Research Center for Geosciences, Potsdam, Germany
J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2014 Proceedings: Volume III, Lecture Notes in Electrical Engineering 305, DOI: 10.1007/978-3-642-54740-9_11, Springer-Verlag Berlin Heidelberg 2014
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11.1 Introduction Three Global Navigation Satellite Systems (GNSS) are currently operational, namely GPS and GLONASS for providing global positioning service and BDS (BeiDou-2) for providing regional positioning service. Other systems are under development in particular the European Galileo. There will be at least four operational GNSS in the near future. The success of all available systems applications and the acceptance of the new systems is a ‘‘must’’, but the transition from single-system to multi-GNSS applications is a challenge, because of the upgraded hardware and tracking networks, implemented Multi-GNSS capable analysis software packages, algorithms, and models. In order to summary the necessary
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