The Multi-GNSS Working Group (formerly: GNSS Working Group) has been established to explore and promote the use of new navigation signals and constellations within the IGS.

Its present core activity is the performance of the Multi-GNSS Experiment (MGEX), which comprises the build-up of a new network of sensor stations, the characterization of the user equipment and space segment, the development of new concepts and data processing tools, and, finally, the generation of early data products for Galileo, QZSS, BeiDou and other emerging navigation systems.

To achieve these goals, the Multi-GNSS Working Group interacts closely with other IGS entities, such as the RINEX WG, the Antenna WG, the Data Center WG and the Infrastructure Committee. It helps to develop and implement new standards for multi-GNSS-related work within the IGS.


Name Affiliation Country Contact Contribution
Rolf Dach AIUB Switzerland Orbit and clock products
Jan Dousa Geod. Obs. Pecny Czech Republic Data quality control
Ahmed El-Mowafy CUT Australia System characterization, data quality control
(see CUT MGEX home page)
Heinz Habrich BKG Germany Data Holdings
Satoshi Kogure JAXA Japan QZSS
Richard Langley UNB Canada Constellation status monitor
Huicui Liu BACC China Data quality control
Oliver Montenbruck DLR/GSOC Germany Chair, Multi-GNSS Working Group
Felix Perosanz CNES France System characterization, products
Chris Rizos UNSW Australia External representation
Axel Rülke BKG Germany Data quality control, real-time streams
Tim Springer ESA/ESOC Germany Selected data analyses
Peter Steigenberger DLR and TUM Germany Orbit and clock products
(see TUM MGEX webpage)
Maik Uhlemann GFZ Germany Orbit and clock products
Rene Warnant ULG Belgium Ionosphere
Qile Zhao Wuhan University China BeiDou

Charter (Jan. 2012)

With the imminent introduction of new civilian signals in GPS, the modernization of GLONASS as well as the development of other Global Navigation Satellite Systems like Galileo and Compass, and further regional overlay systems the IGS is facing a changing landscape. It is essential that the implications for the service are fully analysed and that the new factors affecting its operations are duly taken into account in IGS strategic planning.

Even all currently active constellations comprise a gradually changing mix of satellites transmitting the standard and the new signals. New receiver types will have to be introduced into the network and there will be new requirements on software for handling the data in the Analysis Centres. The long lasting IGS experience of introducing GLONASS in all chains of observation, data transfer and analysis will assist in minimizing the impact of these further changes on the service operations and in integrating the new features into the IGS infrastructure to the advantage of users of the IGS products.

Thus, in order to prepare for upcoming new signals and systems it is essential that IGS gathers experience with tracking the new signals and systems, new receiver and antenna types, inter system biases, and analysis of the new signals. To facilitate these studies the WG sets up and conducts an multi-GNSS tracking experiment (M-GEX) based on GNSS receivers capable of tracking most of the new signals and systems, including experimental satellites. In addition suitable interfaces to organizations already operating or planning to setup multi-GNSS tracking networks have to be established to ensure data availability to IGS components.

As of 2012, the specific goals of the IGS GNSS Working Group are:

  • Bring knowledge about the developments of GPS, GLONASS, GALILEO, COMPASS (and to the extent necessary also overlay systems) which might help to improve or at least contribute to IGS products to the attention of the various participating elements of the IGS through reports and dedicated sessions in IGS workshops.
  • Prepare and conduct the IGS Multi-GNSS tracking experiment (M-GEX) focusing on tracking new signals and constellations by deployed multi-GNSS receivers (hard- and software receivers).
  • In the framework of the M-GEX experiment involve receiver manufacturers to set up a test bed for various receiver and antenna types as a prototype receiver validation facility.
  • Establish suitable interfaces to organizations already or soon operating multi-GNSS networks, e.g., the CONGO network and the Asia-Pacific Multi-GNSS demonstration campaign.
  • Prepare a consolidated feedback to GNSS system engineering based on relevant IGS experience of providing highest accuracy products for the existing systems.
  • Prepare a strategy for IGS participation in the mid- and longer term exploitation of the next generation of GNSS.
  • The WG should coordinate closely with, and seek inputs from IGS Analysis Centers and other IGS WG's as appropriate.

Please include the IGS logo and citation in all websites, presentations, publications, or posters that use IGS data, products, or services. IGS is a service of IAG.