IGS Analysis Center Coordinator (ACC) run by Geoscience Australia and MIT



General Information About the IGS Products


This site gives information about the products of the International GNSS Service (IGS), especially their quality. This introductory page provides general background information. Most of the other pages here contain figures and tables summarizing the results from the IGS product combinations. Those pages are mainly of interest to the IGS Analysis Centers and other GNSS specialists.

The tables and figures for the Final products are updated weekly. Other pages are updated shortly after the corresponding combinations. The figures show the results of the past 60 weeks except for the "Final (ALL)" plots which show the results of the IGS orbit combinations since their beginning in late 1993.

The IGS Analysis Center Coordinator (ACC) has overall responsibility for generating the main official IGS combined products. Currently, there are three IGS product lines for GNSS satellite orbits and clocks, namely the IGS Final, the IGS Rapid, and the IGS Ultra-rapid products. During the periods 2008-2011 and 2012-2015, the IGS ACC functions are performed by NOAA's National Geodetic Survey (NGS) in Silver Spring, Maryland, USA. During previous periods, the ACC functions were performed by the GeoForschnungsZentrum (GFZ Department 1) in Potsdam, Germany (2003-2008), Center for Orbit Determination in Europe (CODE) in Bern, Switzerland and Vienna, Austria (1999-2003), and Natural Resources Canada (NRC) in Ottawa, Canada (1994-1998).

Certain IGS product combination tasks are shared. For the Final products, those components involving the terrestrial reference frame, including the Earth rotation parameters, are produced by a combination of SINEX file submissions, work done at Natural Resources Canada in Ottawa, Ontario, Canada, through January 2010 and done since that time at Institut Géographique National in Paris, France. The internally realized timescales of the IGS, formed by a weighted ensemble of the frequency standards available in the IGS clock products, are maintained by the Naval Research Laboratory, Space Applications Branch, in Washington, DC, USA. Such high-stability timescales are supported for the IGS Rapid and Final products.

The available IGS products are:

Where to get more information about the IGS?

For more information about the International GNSS Service please visit the IGS Central Bureau, which is located at the Jet Propulsion Laboratory in Pasadena, California, USA.

Where and when to get IGS products?

For product archive locations at the IGS Global Data Centers please refer to the information in the link below.

How to use IGS products?

The links below address some frequently asked questions regarding the generation and use of IGS products.