| Term | Definition |
|---|---|
| SIMB | Service d'Installation et de Maintenance des Balises |
| SINEX | Software-Independent Exchange format |
| SIRS | Service d'Installation et de Rénovation des Stations |
| SLR | Satellite Laser Ranging |
| SOD | Service d'Orbitographie DORIS (CNES), France |
| SPOT | Satellite d'Observation de la Terre |
| SSALTO | altimetric and orbitography mission center |
| STCD | STation Coordinates Time Differences USGS = U.S. Geological Survey |
| SWT | Science Working Team |
