United NationsOffice for Outer Space Affairs

Reference Systems

The International Committee on Global Navigation Satellite Systems (ICG) noted a proposal to establish links with national and regional authorities and relevant international organizations, particularly in developing countries. A working group will be established to develop a strategy for support of regional reference systems.

• African Geodetic Reference Frame (AFREF): http://geoinfo.uneca.org/afref/
• Asia and Pacific Regional Geodetic Project (APRGP): http://www.sbsm.gov.cn/pcgiap/98wg/98wg1/aprgp_analysis/aprgp_analysis.htm
• European Position Determination System (EUPOS): http://www.eupos.org
• IAG Reference Frame Sub-Commission for Europe (EUREF) http://www.euref.eu or http://www.euref-iag.net
• Geocentric Reference System for the Americas (SIRGAS): www.sirgas.org

UN-GGIM: Subcommittee on Geodesy - Global Survey on Geodetic Reference Frame Competency

• Website (External Link): https://bit.ly/3fyNBRT

Policy Briefs

• ICG WG D "Reference Frames, Timing and Applications" Policy Brief: Natural Hazards Monitoring using Global Navigation Satellite Systems

Templates on Geodetic and Timing References

Global Navigation Satellite Systems Timescale Descriptions

• Global Positioning System (GPS): GPS Time
• GLObal NAvigation Satellite System (GLONASS): GLONASS Time
• GALILEO (satellite navigation): Galileo System Time (GST) - as of January 2016
• BeiDou Navigation Satellite System (BDS): BeiDou System Time - as of November 2016

Regional Navigation Satellite System/Satellite-based Augmentation System Timescale Descriptions

• Quazi Zenith Satellite System (QZSS): QZSS Time - as of November 2016
• European Geostationary Navigation Overlay (EGNOS): SBAS Timescale Description
• Navigation with Indian Constellation (NavIC) or Indian Regional Navigation Satellite System (IRNSS): RNSS Timescale Description

IGS Timescale Description

• International GNSS Service (IGS): IGS Time V1.0

Global Navigation Satellite Systems Reference Frames Descriptions

• National Geospatial-Intelligence Agency: World Geodetic System 1984 (WGS84)
• Global Geocentric Coordinate System of the Russian Federation: Earth Parameters (PZ-90) - " Parametry Zemli 1990" (updated as of 2018)
• National Bureau of Surveying and Geo-information : China Terrestrial Reference Frame 2000 (CTRF2000)
• European Space Agency (ESA): Galileo Terrestrial Reference Frame (GTRF)
• Reference System Description of QZSS: Japan satellite navigation Geodetic System (JGS)
• International Earth Rotation and Reference Systems Service (IERS): International Terrestrial Reference System (ITRS)
• International Earth Rotation and Reference Systems Service (IERS) : International Terrestrial Reference Frame (ITRF)