| Acronym | Meaning |
 | RESTEC | Remote Sensing Technology Center |
| ESA | European Space Agency |
| TOPEX | Ocean Topography Experiment |
| AF | Air Force |
| SSME | Space Shuttle Main Engine |
| HJD | Helicentric Julian Date |
| FRR | Flight-Readiness Review |
| DOR | Differenced One-way Range |
| SID | Sudden Ionospheric Disturbance |
| NTR | Nuclear Thermal Rocket(ry) |
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