| Acronym | Meaning |
 | NPOESS | National Polar-orbiting Operational Environmental Satellite System |
 | LAWS | Laser Atmospheric Wind Sounder (EOS) |
 | JPL | Jet Propulsion Laboratory |
 | HIRDLS | HIgh-Resolution Dynamics Limb Sounder (EOS) |
 | AMSU | Advanced Microwave Sounder Unit (EOS) |
 | EM | ElectroMagnetic |
 | ITS | Interferometer Thermal Sounder (HIS) |
 | S-HIS | Scanning High Resolution Interferometer Sounder |
 | ABI | Advanced Baseline Imager |
 | FTS | Fourier Transform Spectrometer (HIS |