EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Twenty-Five Years of the International GNSS Service

Allison Craddock1, Gary Johnston2, Felix Perosanz3, Rolf Dach4, Charles Meertens5, Michael Moore2, and Mayra Oyola1
Allison Craddock et al.
  • 1Jet Propulsion Laboratory, California Institute of Technology, MS 238-600, Pasadena, United States of America
  • 2Geoscience Australia, Canberra, Australia
  • 3Centre National D’Ètudes Spatiales, Toulouse, France
  • 4Astronomical Institute of the University of Bern, Bern, Switzerland
  • 5UNAVCO, Boulder, Colorado, United States of America

For over twenty-five years, the International Global Navigation Satellite System (GNSS) Service (IGS) has carried out its mission to advocate for and provide freely and openly available high-precision GNSS data and products.

The IGS is an essential component of the IAG’s Global Geodetic Observing System (GGOS), where it facilitates cost-effective geometrical linkages with and among other precise geodetic observing techniques, including: Satellite Laser Ranging (SLR), Very Long Baseline Interferometry (VLBI), and Doppler Orbitography and Radio Positioning Integrated by Satellite (DORIS). These linkages are fundamental to generating and accessing the International Terrestrial Reference Frame (ITRF).  As it enters its second quarter-century, the IGS is evolving into a truly multi-GNSS service, and at its heart is a strong culture of sharing expertise, infrastructure, and other resources for the purpose of encouraging global best practices for developing and delivering GNSS data and products all over the world.

This poster will present an update on current IGS products and operations, as well as highlights on recent organizational developments and community activities. The impacts and benefits of global cooperation and openly available data will be emphasized, and information about the IGS stations and network, contributions to the International Terrestrial Reference Frame solutions, and product applications will be presented. A summary of IGS products, with emphasis on analysis, coordination, applications, and their availability will be described. Information about efforts to form new groups supporting product generation within IGS open data and product policies will be included. Information about the themes and topics of discussion for the upcoming 2020 IGS Workshop in Boulder, Colorado, USA will also be provided.

How to cite: Craddock, A., Johnston, G., Perosanz, F., Dach, R., Meertens, C., Moore, M., and Oyola, M.: Twenty-Five Years of the International GNSS Service, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-6153,, 2020


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