Welcome to the Home Page of the IGS Multi-GNSS Experiment!
Scope
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 and QZSS systems, as well as from modernized GPS and GLONASS satellites and any space-based augmentation system (SBAS) of interest. Analysis centers will attempt to estimate inter-system calibration biases, compare equipment performance and further develop processing software capable of handling multiple GNSS observation data.MGEX News
| 2012/03/01 | All participating institutions have now transitionend to the RINEX3 format for observation and navigation files submitted to the MGEX data archives. RINEX2 has been discontinued for MGEX purposes (but continues to be used for the operational IGS network). |
| 2012/12/17 | First release of QZSS products by JAXA (see section Products) |
| 2012/11/10 | Provision of orbit and clock products for Galileo and QZSS (see section Products) |
| 2012/11/10 | Revised interactive network map (see section Network) |
| 2012/11/10 | Draft parameters for BeiDou processing (see BeiDou page) |
| 2012/10/25 | Recommended parameters for Galileo and GIOVE processing (see Galileo page) |
| 2012/10/25 | Recommended parameters for QZSS processing (see QZSS page) |
Constellation Status
Status information for the various navigation satellite systems can be obtained by clicking on the icons below. Primary attention is given to the emerging constellations that are currently deployed and undergoing initial validation.  |
 |
 |
 |
 |
 |
| GPS | GLONASS | Galileo | BeiDou | QZSS | SBAS |
Network
An overview of the current MGEX network is shown in the map below. For detailed information on individual stations see the MGEX station list. The latetst site logs are available from the IGS MGEX site log archive.Real-time data streams are available for a subset of MGEX stations on the MGEX NTRIP caster of BKG. All streams employ a prototype implementation of the new RTCM3-MSM Multi-Satellite Message format, which provides a receiver-independent and highly compact data format including all relevant observation types (pseudorange, carrier phase, Doppler, carrier-to-noise ratio).
Data Holdings
MGEX observation files are available from various repositories hosted by the Crustal Dynamics Data Information System (CDDIS), Institut Géographique National (IGN), and Bundesamt für Kartographie und Geodäsie (BKG). The archives provide daily RINEX files at 30s update rate as well as high-rate (1 Hz) files for selected stations. The RINEX3 format is supported as the primary data format in view of its capability to handle all required constellations and observation types. An overview of tracked satellites and supported observation types for all MGEX stations is provided in a dedicated RINEX Observation File Summary maintained by the Astronomical Institute of the University of Bern.Products
Orbit and clock products that become available as part of the MGEX data analysis will be made available at the CDDIS MGEX product archive as well as mirror sites hosted by IGN and ENSG. The products are stored in weekly directories (identified by the 4-digit GPS week) and identified by a two letter acronym for the contributing agency, followed by the letter "m" in the file name. Four MGEX analyses institutions are presently contributing multi-GNSS products.- Centre National d'Etudes Spatiales (CNES), Collecte Localisation Satellites (CLS), Groupe de Recherche de Géodésie Spatiale (GRGS)
- Center for Orbit Determination in Europe (CODE)
- GeoForschungsZentrum Potsdam (GFZ)
- Technische Universität München (TUM)
| Institution | Products | Constellations | Availability (week/day) | References | |
| CNES/CLS | grmyyyyd.sp3 | GNSS orbits and clocks (15 min) | GAL | since 1692/1 | Loyer et al. 2012 |
| COD | codyyyyd.sp3 | GNSS orbits and clocks (15 min) | GPS+GLO+GIO/GAL | since 1689/5 | Prange et al. 2012 |
| comyyyy7.erp | Earth rotation parameters | ||||
| GFZ | gfmyyyyd.sp3 | GNSS orbits and clocks (15 min) | GPS+GAL | 1680/0-1683/6 | Uhlemann et al. 2012 |
| gfmyyyyd.clk | GNSS and station clocks (5 min) | ||||
| gfmyyyyd.bia | Inter-system biases | ||||
| gfmyyyy7.erp | Earth rotation parameters | ||||
| gfmyyyy7.sum | Analysis report, solution characteristics | ||||
| TUM | tumyyyyd.sp3 | GNSS orbits and clocks (5 min) | GAL+QZS | since 1711/1 | TUM MGEX webpage |
For QZSS orbit and clock data, interested users are also referred to the QZSS final products provided by JAXA.
Contributing to MGEX
See Call for Participation document for details. Submissions should be submitted through the response form. Contributing stations must submit a site log to igscb. For further information contact mgex @ igs.org.Last Updated: 2012/03/01