IGS

International GNSS Service

Data Reprocessing Campaign

a first full reanalysis of all IGS GPS data collected since 1994

IGS
OBJECTIVE
The Analysis Centers (ACs) of the International GNSS Service are in the process of reanalyzing the full history of GPS data collected by the IGS global network since 1994 in a fully consistent way using the latest models and methodology. This is the first such full reprocessing by the IGS, but it is expected to be repeated in the future as further analysis changes are made.
SUMMARY
OF
PRODUCTS
The expected Analysis Center and combined IGS products include:
    daily GPS orbits & satellite clocks
    • 15-minute intervals (SP3c format)
    • satellite clocks in IGS timescale (loosely aligned to GPS time)
    daily satellite & tracking station clocks
    • 5-minute intervals (clock RINEX format)
    • in IGS timescale (loosely aligned to GPS time)
    daily Earth rotation parameters (ERPs)
    • from SINEX & classic orbit combinations (IGS erp format)
    • x & y coordinates of pole
    • rate-of-change of x & y pole coordinates
    • excess length-of-day (LOD)
    weekly terrestrial coordinate frames with ERPs
    • with full variance-covariance matrix (SINEX format)
    possible other products ?
    • ionosphere maps, tropospheric zenith path delays, etc
    • not part of this first campaign
ANALYSIS
CENTERS
The participating Analysis Centers contributing complete solutions to this effort are:
    CODE — Center for Orbit Determination in Europe, Switzerland
    EMR — Natural Resources Canada, Canada
    ESA — European Space Operations Centre (ESOC), ESA, Germany
    GFZ — GeoForschungsZentrum/Potsdam, Germany
    JPL — Jet Propulsion Laboratory, USA
    MIT — Massachusetts Institute of Technology, USA
    NGS — National Geodetic Survey, NOAA, USA
    PDR — GeoForschungsZentrum/Potsdam & Technical University of Dresden, Germany
    SIO — Scripps Institution of Oceanography, USA

In addition, some centers provide weekly SINEX solutions to help densify the terrestrial reference frame, particularly for GPS stations located near tide gauges (associated with the TIGA Pilot Project); work is underway to perhaps include associated satellite orbits and clocks:

    GTZ — GFZ TIGA, Germany
    ULR — University of La Rochelle, France

Summaries of the analysis strategies and procedures for each AC are posted at the IGS Central Bureau. Submitted AC test solution files are posted at this GFZ site.

The product combination centers are: