Using GLONASS in Combined GNSS Receivers: Current Status
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The paper focuses on using GLONASS in state-of-the-art combined GNSS (GPS/GLONASS) receivers. The launch of GLONASS-M satellite is an important event that opens new horizons for satellite navigation. Correspondingly, the description of advantages associated with new hardware and new navigation data of GLONASS-M satellites is given. Also, current status of GLONASS and plans of its modernization are considered.
For combined use of GPS and GLONASS, interoperability issues that originate from differences in initial designing of both systems need to be resolved. It is demonstrated that such issues have been resolved at the level that meets all the practical needs. Also, there were interoperability issues connected with working in differential DGPS/RTK modes when RTCM messages served for broadcast DGPS/RTK data. It is shown that an appropriate solution has been found for each of those issues, thus the current version of RTCM standard is free of any GPS/GLONASS interoperability issues. Also, the materials on using GNSS receivers in different positioning modes are provided.
Additional GLONASS satellites help in maintaining reliable RTK positioning under environments with limited visibility of satellites. At the same time, there are advantages associated with fast ambiguity resolution, detection and exclusion of anomalies etc. Also, questions related to precise GLONASS ephemerides and Network RTK applications are considered. Finally, a summary of advantages of GNSS receivers (that will support Galileo as well) over GPS-only receivers is given.
- Reprinted with permission from The Institute of Navigation (http://ion.org/) and The Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation, (pp. 1046-1057). Fairfax, VA: The Institute of Navigation.
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