Novel Concept in Multiple GNSS Network RTK processing

Hans-Jurgen Euler and Joachim Wirth

Abstract:	In recent years more receivers supporting more than one GNSS came to market. Each manufacturer is offering an independent RTK baseline application. These applications are mainly supporting the operation in conjunction with their own reference stations with identical set of observations. Especially for an arbitrary mix of receivers of different manufacturers the overall concepts for processing GNSS observations in real-time need adaptation. New concepts for processing multiple receiver observation information are desperately required. The paper is presenting an option for optimal use of a multi- GNSS receiver together with other GNSS receivers not supporting the complete set of GNSS. Also mix of receiver supporting the same GNSS, but not all observations have to be covered by new approaches. Summarizing the scenarios for users having invested in multiple-GNSS receiver equipment, one has to acknowledge, that either the user has to establish his own reference station for his work or the user can use only part of the capabilities of his new, expensive equipment. Furthermore the paper details on the processing of observation information from a receiver supporting two- GNSS together with single GNSS reference station receivers in a network application. The processing concept presented in this paper is specifically adapted for any combination of GNSS receivers. The only restriction is that a GNSS needs to be supported by at least two receivers in the network. Computational results are presented in various combinations for several single-GNSS receivers with multiple-GNSS receivers. The advantages of these combinations are highlighted. The conclusion is that not necessarily all reference stations have to be equipped with receivers supporting all required GNSS for efficient use of the multiple-GNSS roving receivers. In the extreme a GPS-GLONASS or GPS-Galileo receiver can be used efficiently together with two reference stations supplying either of the GNSS independently. The study has been conducted as part of a Galileo project. Therefore results will be also presented based on the combination of GPS and Galileo systems. The operation shows the positioning of combined GPS-Galileo observation datasets together with a GPS-only and Galileo-only reference station.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	679 - 686
Cite this article:	Euler, Hans-Jurgen, Wirth, Joachim, "Novel Concept in Multiple GNSS Network RTK processing," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 679-686.
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