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GIPSY-OASIS, or GIPSY, is the GNSS-Inferred Positioning System and Orbit Analysis Simulation Software package. GIPSY is developed by the Jet Propulsion Laboratory (JPL), and maintained by the Near Earth Tracking Applications and Systems groups.


  • Analysis of data from Global Navigation and Satellite Systems (GNSS):
    • Global Positioning System (GPS)
    • Russian GLONASS
    • French DORIS
    • Satellite Laser Ranging (SLR) system
  • Precise centimeter-level GNSS-based positioning and timing:
    • Space platforms, including low-Earth orbiters and GNSS constellations
    • Airplanes
    • Terrestrial (ground) stations, static or moving
    • Time transfer
  • Single high-level user interface supports majority of precise positioning applications
  • Single-receiver ambiguity resolution using JPL's GPS orbit and clock products
  • Documentation accompanying software modules, and online help
  • Training at annual GIPSY user group classes, and online
  • Hundreds of research and educational users in more than 20 countries
  • Builds on more than 25 years of JPL experience with GPS data analysis


  • Terrestrial positioning for geophysical research:
    • Earth deformation, plate tectonics
    • GNSS Networks (e.g. PBO and SCIGN)
    • Ice flow
    • Climate studies through observation of troposphere and ionosphere
    • Reference frame (geocenter and scale) and Earth rotation parameters
  • Airplane positioning
  • Precise orbit determination
    • Low-Earth orbiters: Topex/Poseidon, Jason-1, Jason-2/OSTM, GRACE, Champ, SAC-C, COSMIC, Space Shuttle (e.g. SRTM), Commercial Satellites
    • GNSS constellations including GPS and GLONASS


  • *** new ***
    2018 AGU GipsyX/GIPSY User Group Meeting
    Date: Wed 12 Dec, 2018
    Time: 6:30-8:00 PM
    Location: Rooms 8/9
    Renaissance Washington, DC Downtown Hotel
    999 9th Street NW, Washington, DC 2001-4427
    Agenda: Topics include new features added, Multi-GNSS, and ITRF14 reprocessing.

    2016 AGU GIPSY User Group Meeting
    Room: Golden Gate B
    Location: San Francisco Marriott Marquis, 780 Mission Street, San Francisco, California, 94103 USA
    Date: Wed December 14, 2016
    Time: 6:30-8:30 PM
    Agenda: Items related to GipsyXx beta release

  • GIPSY-OASIS Course (Covilha, Portugal, September 5-7, 2016) Static and Kinematic GPS-based Positioning Using GIPSY/OASIS
  • GIPSY version 6.4
    Release Date: December 2, 2015

    Support for larger reference frames, time-varying gravity, and other minor changes
  • GIPSY User Group Meeting
    Date: December 17, 2014
    Meeting presentation now available to registered GIPSY users at Documentation website.
  • GIPSY version 6.3
    Release Date: March 26, 2014

    Enables single-receiver ambiguity resolved positioning with JPL's orbit and clock products for the GPS constellation. Adopts IERS2010 standards.
  • Operational GPS Orbits and Clocks
    Adopts IERS2010/IGS08 standards. Includes Rapid GPS High-Rate Clock Products with 30-second sampling. Repro 2.1 products released Novemeber 6, 2014
  • Ultra-Rapid GPS Orbits and Clock Products
    < 2-hour latency, 5 cm accuracy, and updated hourly. Available here.
  • Reprocessed GPS Orbits and Clocks
    Reprocessed products with IERS2010/ IGS08 standards available for August 16, 1992 - present.