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DME distance measuring equipment
DPE data processing element
EGONOS European Geostationary Navigation Overlay Service
FAA U.S. Federal Aviation Administration
FSL free space loss
GAGAN GPS and geo-augmented navigation system
GBAS ground-based augmentation system
GEO geostationary Earth orbit
GGS GPS Geodetic System
GIVE grid ionospheric vertical error
GLONASS GLObal NAvigation Satellite System (Russia)
GM Gravitational Mass
GNSS Global Navigation Satellite Systems
GPS Global Positioning System
GRS Geodetic Reference System
HAL horizontal alert limit
HDOP horizontal dilution of precision
HMI hazardously misleading information
HPL horizontal protection level
ICAO International Civil Aviation Organization
ICD interface control document
ICG International Committee of GNSS
IFB inter-frequency bias
IFR instrument flight rules
iGMAS international GNSS Monitoring and Assessment System
IGS International GNSS Service
ILS instrument landing systems
IME inter-measurement element
IMU inertial measurement unit
INS inertial navigation systems
IPP ionospheric pierce point
IRNSS Indian Regional Navigation Satellite System
IRU inertial reference units
ITRF International Terrestrial Reference Frame
ITRS International Terrestrial Reference System
ITU International Telecommunication Union

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