List of abbreviations: G

G/T Ratio of gain to noise temperature
GBS Geographical Band Segmentation
GEMS Global Environment Monitoring Systems
GEO Geostationary Orbit (satellite)
GES Ground Earth Station
GFSK Gaussian Frequency-Shift Keying
GLONASS GLobal NAvigation Satellite System (Russia)
GMDSS Global Maritime Distress and Safety System
GMPCS Global Mobile Personal Communication by Satellite
GMSK Gaussian-filtered Minimum-Shift Keying
GNSS Global Navigation Satellite System
GOES Geostationary Operational Environmental Satellite
GPS Global Positioning System (USA)
GRGS Groupe de Recherches de Géodesie Spatiale (F)
GSM Global System for Mobile Communications
GSM-900 Groupe Spécial Mobiles (European GSM)
GSM-R Global System for Mobile Communications on Railways
GSO Geostationary Satellite Orbit
GVLS Global Verification and Location System