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Technische Universität München

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Institut für Astronomische und Physikalische Geodäsie

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Multi-GNSS EXperiment (MGEX) of the International GNSS Service (IGS)

Fachgebiet Satellitengeodäsie of Technische Universität München (TUM) contributes Galileo and QZSS orbits to the IGS MGEX project. Both orbits are based on a dual-GNSS processing together with GPS data of selceted CONGO and MGEX stations.

Orbit and clock data are based on 5-day arcs for Galileo and 3-day arcs for QZSS, both with 5 radiation pressure parameters. They are provided in daily SP3c files with 5 minutes sampling.

The TUM MGEX products are available at the Crustal Dynamics Data Information System (CDDIS), currently starting with GPS week 1711. Products of previous weeks will be provided step-by-step.

Processing options

  GPS Galileo QZSS
Observables L1 and L2 E1 and E5a L1 and L5
Arc length 3 days 5 days 3 days
A priori orbit CODE prediction from previous day broadcast orbit
Estimated orbit parameters fixed 6 Keplerian elements and 5 radiation pressure parameters
Satellite antenna offsets igs08.atx MGEX MGEX L1
Satellite antenna PCV igs08.atx not considered
Receiver antenna offsets igs08.atx chamber calibrations

Tracking Network

The tracking network sonsists of CONGO (squares) and MGEX (diamonds) stations. Stations used for the QZSS orbit and clock determination are given in red.


  • Langley, R.B.; Banville, S.; Steigenberger, P.: First Results: Precise Positioning with Galileo Prototype Satellites; GPS World, Vol. 23, Nr. 9, pp 45-49, 2012, Externer Link.
  • Hauschild, A.; Steigenberger, P.; Rodriguez-Solano, C.: QZS-1 Yaw Attitude Estimation Based on Measurements from the CONGO Network; Navigation, Vol. 59, Nr. 3, pp 237-248, DOI: 10.1002/navi.18, 2012.
  • Steigenberger, P.; Hauschild, A.; Montenbruck, O.; Rodriguez-Solano, C.; Hugentobler, U.: Orbit and clock determination of QZS-1 based on the CONGO network; Proceedings of the 2012 International Technical Meeting (ITM) of the Institute of Navigation, pp 1265-1274, Institute of Navigation, 2012, Externer Link, Download.
  • Hauschild, A.; Steigenberger, P.; Rodriguez-Solano, C.: Signal, orbit and attitude analysis of Japan’s first QZSS satellite Michibiki; GPS Solutions, Vol. 16, Nr. 1, pp 127-133, Springer, ISSN 1080-5370, DOI: 10.1007/s10291-011-0245-5, 2012.
  • Steigenberger, P.; Hugentobler, U.; Montenbruck, O.; Hauschild, A.: Precise orbit determination of GIOVE-B based on the CONGO network; Journal of Geodesy, Vol. 85, Nr. 6, pp 357-365, Springer, ISSN 0949-7714, DOI: 10.1007/s00190-011-0443-5, 2011, Externer Link.


Peter Steigenberger