ACRONYMS
ACRE
Advanced Clock and Range Experiment
ARISTOTELES
Gravity Gradient Satellite of the European Space Agency
AS
Antispoofing (of GPS satellite signal)
BE-C
NASA “Beason-C” Satellite Mission
BIPM
Bureau International des Poids et Mesures
CDDIS
Crustal Dynamics Data Information System (NASA Crustal Dynamics Project)
CDP
Crustal Dynamics Project, NASA
CF
Center of figure
CIGNET
Cooperative International GPS Network
CM
Center of mass
DORIS
Doppler Orbitography and Radiopositioning Integrated by Satellite
DSN
Deep Space Network
ESA
European Space Agency
EDM
Electronic Distance Measurement
EOS
Earth Observing Satellite
ERDE
Extended Research and Development Experiment
ERS-1
Earth Resources Satellite of the European Space Agency
FAGS
Federation of Astronomical and Geophysical Data Analysis Services
FLINN
Fiducial Laboratories for an International Natural science Network
GEO-1K
Geodetic Earth Orbiting (low-altitude satellite at 1.5 km)
GEOS
Geodynamics Experimental Ocean Satellite
GEOSAT
Geodetic Earth Orbiting Satellite
GEOSCOPE
French Global Long-Period Seismometers Network
GIG'91
First GPS IERS and Geodynamics Experiment
GIS
Geographic Information System
GLONASS
USSR Global Navigation Satellite System
GLRS
Geoscience Laser Ranging System
GOOS
Global Ocean Observing System
GOTEX
GPS Orbit Tracking Experiment
GP-B
Gravity Probe-B
GPS
Global Positioning System
GSE
The Group of Scientific Experts
GSN
Global Seismic Network
IABGN
International Absolute Gravity Base Station Network
IAG
International Association of Geodesy
IAGA
International Association of Geomagnetism and Aeronomy
IAHS
International Association of Hydrological Sciences
IAMAP
International Association of Meteorology and Atmospheric Physics
IAPSO
International Association for the Physical Sciences of the Ocean
IASPEI
International Association of Seismology and Physics of the Earth's Interior
IAVCEI
International Association of Volcanology and Chemistry of the Earth 's Interior
IDA
International Deployment of Accelerometers Network
IERS
International Earth Rotation Service
IGS
International GPS Geodynamics Service
INTERMAGNET
INTERnational real-time geoMAGnetic observatory NETwork
IPMS
International Polar Motion Service
IRIS
Incorporated Research Institutions for Seismology
ISOP
International Seismological Observing Period
IUGG
International Union of Geodesy and Geophysics
LAGEOS
Laser Geodynamics Satellite
LLR
Lunar Laser Ranging
MERIT
(An international program to) Monitor the Earth's Rotation and Intercompare the Techniques of observation
NEOS
National Earth Orientation Service
PGGA
Permanent GPS Geodetic Array
PLATO
Permanent Large Array of Terrestrial Observatories
PPS
Precise Positioning System
PRARE
Precise Range and Range-rate Experiment (German)
PRAREE
PRARE Extended Version
QUASAR
USSR Very Long Baseline Interferometric Network of radio telescopes
RSL
Relative Sea Level
SA
Selective Availability (of GPS satellite signal)
SEASAT
Sea Satellite
SLR
Satellite Laser Ranging
SPOT
Satellite pour l'Observation de la Terre
SPS
Standard Positioning System
TOPEX/
USA/French system to measure sea surface topography
POSEIDON
for determination of global ocean circulation and to improve the Earth's gravity model
TRANET
TRAnsit NETwork
TRF
Terrestrial Reference Frame
UT1
A version of Universal Time based upon time observations at a number of observatories
UTC
Coordinated Universal Time, based on an atomic standard of time
VLBI
Very Long Baseline Interferometry
