| Acronym | Meaning |
 | RRB | Risk Reduction Branch |
| EDRS | European Data Relay Satellite |
| PPS | Pulses Per Second |
| IRD | Instrument Requirement Document |
| LRIR | Limb Radiance Inversion (or Infrared) Radiometer |
| AMP | Asynchronous Multiprocessing |
| GCA | Geophysics Corporation Of America |
| C++ | An Object-oriented Programming Language Based On C |
| MSISR | Millstone Hill Incoherent Scatter Radar |
| SI | Systeme International |
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