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 |
