| Acronym | Meaning |
 | OEAS | Orbital Emergency Arresting System |
| G | IWG Ground Interface Working Group |
| SLOS | Star Line Of Sight |
| IMPLS | Impulse |
| SS&A | Space Systems And Applications |
| FDI | Fault Detection And Identification |
| CI | Course (deviation Display) Invalid |
| OGE | OperatingGroundEquipment |
| CDS | Central Data System |
| PI | PaYload Interrogator |
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