| Acronym | Meaning |
| GPIB | General Purpose Interface Board |
| GGI | GPS Geoscience Instrument |
| UEDS | Unidata Experimental Data Service |
| LSFC | Langley Space Flight Center |
| ENVISAT | European Environmental Satellite |
| FSK | Frequency Shift Key(ing) |
| POGO | Polar Orbiting Geophysical Observatory |
| NOIC | National Oceanographic Instrumentation Center |
| TDM | Time Division Multiplex |
| EM | Electron Microscope |