GNSS Final AC Orbit Solution Product

doi: 10.5067/GNSS/GNSS_IGSACORB_001

Data Center Citation

Noll, Carey E., The Crustal Dynamics Data Information System: A resource to support scientific analysis using space geodesy, Advances in Space Research, Volume 45, Issue 12, 15 June 2010, Pages 1421-1440, ISSN 0273-1177,

Data Citation

International GNSS Service, GNSS Final AC Orbit Solution Product, Greenbelt, MD, USA:NASA Crustal Dynamics Data Information System (CDDIS), Accessed [[enter user data access date]] at doi:10.5067/gnss/gnss_igsacorb_001.

Other standard citation formats may be used for this data set and can be found at the DOI Citation Formatter website.

More information about CDDIS data citations and acknowledgments is available.


  • Name: GNSS Final AC Orbit Solution Product from the Crustal Dynamics Data Information System (CDDIS)
  • Format: SP3, UNIX compressed ASCII
  • Spatial Coverage: 90.0 to -90.0, 180.0 to -180.0
  • Temporal Coverage: 1992-01-01 to present
  • Temporal Resolution: Daily
  • File Size: 100 Kbytes/day
  • Platforms: GPS, GLONASS


The IGS final orbit products can be used to determine precise coordinates of the observing stations, gravity field parameters, and Earth orientation parameters. The IGS final products are the basis for the IGS reference frame and are intended for those applications demanding high consistency and quality./p>

This derived product set consists of Global Navigation Satellite System Final Orbit Product (daily files, generated weekly) from the NASA Crustal Dynamics Data Information System (CDDIS). GNSS satellites provide autonomous geo-spatial positioning with global coverage. GNSS data sets from ground receivers at the CDDIS consist primarily of the data from the U.S. Global Positioning System (GPS) and the Russian GLObal NAvigation Satellite System (GLONASS). Since 2011, the CDDIS GNSS archive includes data from other GNSS (Europe’s Galileo, China’s Beidou, Japan’s Quasi-Zenith Satellite System/QZSS, the Indian Regional Navigation Satellite System/IRNSS, and worldwide Satellite Based Augmentation Systems/SBASs), which are similar to the U.S. GPS in terms of the satellite constellation, orbits, and signal structure. Analysis Centers (ACs) of the International GNSS Service (IGS) retrieve GNSS data on regular schedules to produce precise orbits identifying the position and velocity of the GNSS satellites. The IGS Analysis Center Coordinator (ACC) uses these individual AC solutions to generate the official IGS final combined orbit products. The IGS AC orbit products consist of daily orbit files, generated on a weekly basis with a delay of approximately 10 days (from the last day of the week). All orbit solution files utilize the extended standard product-3 (SP3c) format and span 24 hours from 00:00 to 23:45 UTC.

Data Access

The GNSS Final AC Orbit Solution Products (GPS and GPS+GLONASS solutions) are online:

Append the following directory and file names to the starting directory:


as described in the table below.

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codCODE (3 day long arc solution)
cofCODE (1 day solution)
emxNRCan (GLONASS only)
iacMCC (GLONASS only)
iglIGS final solution combination (GLONASS only)
igrIGS rapid solution combination
igsIGS final solution combination
iguIGS ultra-rapid solution combination
igvIGS ultra-rapid solution combination (GLONASS only)
mccMCC (GLONASS only from SLR data)
nclUniversity of Newcastle
Code Meaning
AAAanalysis center name/type of solution
Dday of week (0-6, 7 indicates weekly)
.Z UNIX compressed file