The Multi-GNSS Experiment (MGEX) has been set-up by the IGS to track, collate and analyze all available GNSS signals. This includes signals from the BeiDou, Galileo, QZSS, and NAVIC systems, as well as from modernized GPS and GLONASS satellites and any space-based augmentation system (SBAS) of interest. Analysis centers characterize new satellites and signals, compare equipment performance and further develop processing software capable of handling multiple GNSS observation data. The IGS product portfolio will contoinuously be extended to cover precise ephemeris data and bias information for all constellations.

Over a period of four years, a global network of multi-GNSS stations has been established and integrated with the existing network of GPS/GLONASS reference stations. In parallel, orbit and clock products for most new constelaltions are generated on a routine basis. It has therefore been decided in early 2016 to terminate the experimental phase of MGEX and to pursue the IGS multi-GNSS activities as a pilot project. Given the high recognition received so far, the name "MGEX" will be retained for the pilot project.

GPS	GLONASS	Galileo	BeiDou	QZSS	NAVIC	SBAS

Status information and reference data for the various navigation satellite systems can be obtained by clicking on the icons above. Primary attention is given to the emerging constellations that are currently deployed and undergoing initial validation.

The current status of the global multi-GNSS network is shown on the IGS Network page along with supporting information from the site database.

Data	Products

An overview of MGEX offline data holdings and real-time data streams is given on the Data page. For offline and real-time products, please refer to the Products page.

In accord with the overall policy of the IGS, all MGEX data and products are freely available for public use. To help IGS agencies justify funding requests, we request that users include a citation when use of IGS data or products results in a publication. For MGEX-related work, please reference

• Montenbruck O., Steigenberger P., Prange L., Deng Z., Zhao Q., Perosanz F., Romero I., Noll C., Stürze A., Weber G., Schmid R., MacLeod K., Schaer, S., "The Multi-GNSS Experiment (MGEX) of the International GNSS Service (IGS) – Achievements, Prospects and Challenges", Advances in Space Research 59(7):1671-1697 (2017), DOI: 10.1016/j.asr.2017.01.011 .
• Montenbruck O., Steigenberger P., Khachikyan R., Weber G., Langley R.B., Mervart L., Hugentobler U., "IGS-MGEX: Preparing the Ground for Multi-Constellation GNSS Science", InsideGNSS 9(1):42-49 (2014).

For general IGS data and products, please include a citation of

• Dow J.M., Neilan R. E., Rizos C., "The International GNSS Service in a changing landscape of Global Navigation Satellite Systems", Journal of Geodesy 83(3-4):191-198 (2009). DOI: 10.1007/s00190-008-0300-3

For specific MGEX products, links to recommended references are provided in the products table.

The Multi-GNSS Pilot Project encourages contributions to its overall goals by interested institutions and individuals. New contributions may cover data, products and analyses of all global and regional navigation satellite systems, but should complement existing MGEX capabilities and avoid redundancy. Specific areas of interest include support of NAVIC, 3rd generation BeiDou satllite signals, the combination and validation of multi-GNSS orbit and clock products, the characterization of the GNSS space segment (radiation pressure modeling, antenna calibrations, etc.), and the generation of real-time multi-GNSS products. Proposals for new contributions can be coordinated through the various members of the Multi-GNSS Working Group.