The International GPS Service for Geodynamics (IGS) is an International Service under the Federation of Astronomical and Geophysical Data Analysis Services (FAGS). IGS has developed a worldwide system to put high quality GPS (Global Positioning System) data online within one day and data products within two weeks delay. The system consists of about 125 satellite tracking stations, three Data Centers and seven Analysis Centers. The GPS data sets are used to generate GPS satellite ephemerides, Earth rotation parameters, IGS tracking station coordinates and velocities, GPS satellite and IGS tracking station clock information.
For further information link to the IGS home page http://igscb.jpl.nasa.gov/ or contact:
Dr. Ruth E. Neilan
Director IGS Central Bureau
Jet Propulsion Laboratory/Caltech
MS 238-540
4800 Oak Grove Drive
PASADENA CA 91190
U.S.A.
FAX: +1-818-393-6686
e-mail: igscb@igscb.jpl.nasa.gov