Next-generation GNSS constellations for GGOS-compliant geodetic solutions (NextGNSS4GGOS)

Time Frame:  01 Dec 2021 – 30 Nov 2024
Funding:  DFG
Principal Investigator: Susanne Glaser

Personnel GFZ:  Shrishail Raut, Patrick Schreiner, Rolf König, Hans Neumayer, Harald Schuh

The overall project goal of NextGNSS4GGOS is to assess the benefits of next-generation Global Navigation Satellite Systems (NextGNSS) constellations beyond current GPS, GLONASS, Galileo, or Beidou for the three key geodetic objectives: (1) the generation of the global terrestrial reference frame (TRF), (2) the monitoring of Earth’s orientation in space and its rotation (EOP), and (3) the monitoring of shape and variations of Earth’s physical figure, all of them meeting the requirements defined by the Global Geodetic Observing System (GGOS).

Comprehensive and most realistic simulations will be carried out in order to analyze the potential of NextGNSS constellations with new observation types (inter-satellite ranges, highly precise optical clocks, non-gravitational accelerations, attitude data, laser-retroreflector for Satellite Laser Ranging, transmitter for Very Long Baseline Interferometry) for improved TRF, Earth orientation parameters (EOP) and gravity field determination. Therefore, the central research question of this proposal is addressed as:

Can envisaged NextGNSS-based TRFs, EOPs, and gravity field models meet the GGOS requirements of 1 mm accuracy and 1 mm per decade long-term stability?


  1. Glaser, S., Koenig. R., Raut, S., Schreiner, P., Neumayer, Hans., Männel, B., Schuh, H. (2022): Next generation GNSS for improved geodetic parameters. COSPAR2022 44th General Assembly July 16-24, 2022, Athens, Greece.
  2. Schreiner, P., König, R., Glaser, S., Raut, S., Neumayer, K. H., and Schuh, H. (2022): On the potential of future observation types for the next generation GNSS, 2nd Symposium of IAG Commission 4 “Positioning and Applications”, Potsdam, Germany, 5–8 Sep 2022, iag-comm4-2022-23.
  3. Raut, S., Glaser, S., Mammadaliyev, N., Schreiner, P. A., König, R., Schuh, H. (2022): Assessing the potential of VLBI transmitters on next generation GNSS satellites for geodetic products - Abstracts, IAG International Symposium on Reference Frames for Applications in Geosciences (REFAG 2022) (Thessaloniki, Greece 2022).

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