| ACT | Atacama Cosmology Telescope |
| AI | Agenda Item |
| ALMA | Atacama Large Millimeter/submillimeter Array |
| ALOS | Advanced Land Observing Satellite |
| AMR | Advanced Microwave Radiometer |
| AMR-C | Advanced Microwave Radiometer—Climate Quality |
| AMS | Aeronautical Mobile Service |
| AMSR2 | Advanced Microwave Scanning Radiometer 2 |
| AMSR3 | Advanced Microwave Scanning Radiometer 3 |
| AMSU-A | Advanced Microwave Sounding Unit A |
| APEX | Atacama Pathfinder Experiment |
| APR | Airborne Precipitation Radar |
| ARO | Arizona Radio Observatory |
| ATCA | Australia Telescope Compact Array |
| ATMS | Advanced Technology Microwave Sounder (JPSS) |
| BICEP-Keck | The BICEP and Keck arrays of small CMB telescopes |
| CEPT | European Post and Telecommunications Conference |
| CFOSAT | Chinese-French Oceanography Satellite |
| CFR | Code of Federal Regulations (U.S.) |
| CH | methyladyne |
| CH3OH | methanol |
| CIMR | Copernicus Imaging Microwave Radiometer (ESA) |
| CIR | Coronal Interaction Region |
| CITEL | Inter-American Telecommunications Commission |
| CLASS | Cosmology Large Angular Scale Surveyor |
| ClO | chlorine monoxide |
| CMA | China Meteorological Administration |
| CMB | cosmic microwave background |
| CME | coronal mass ejection |
| CNPC | Control and Non-Payload Communications |
| CNSA | China National Space Administration |
| CO | carbon monoxide |
| COMPIRA | Coastal and Ocean Measurement Mission with Precise and Innovative Radar Altimeter (JAXA) |
| CONAE | Comisión Nacional de Actividades Espaciales (Argentinian space agency) |
| CS | carbon monosulfide |
| dBW | decibel watt [power in dBW = 10 log10 (Power/1W)] |
| DLITE | Deployable Low Frequency Ionosphere and Transient Experiment |
| DMSP | Defense Meteorological Satellite Program |
| DoD | Department of Defense |
| DPR | Dual frequency Precipitation Radar |
| DSM | Dynamic Spectrum Management |
| EESS | Earth Exploration-Satellite Service |
| e.i.r.p. | equivalent isotropically radiated power |
| EOP | Earth Orientation Parameters |
| epfd | equivalent power flux density |
| ESA | European Space Agency |
| ESAA | Earth Stations Aboard Aircraft |
| ESIM | Earth station in motion |
| EUMETSAT | European Meteorological Satellite agency |
| EVN | European VLBI Network |
| FAA | Federal Aviation Administration |
| FAST | Five-hundred-meter Aperture Spherical Radio Telescope |
| FEDOME | Fédération des Données Météorologiques de l’Espace (France) |
| FEMA | Federal Emergency Management Agency |
| FFT | fast Fourier transform |
| FS | Fixed Service |
| FSS | Fixed-Satellite Service |
| GBT | Green Bank Telescope |
| GCOM-W | Global Change Observation Mission—Water |
| GLT | Greenland Telescope |
| GMDSS | Global Maritime Distress Safety Systems |
| GMI | GPM Microwave Imager |
| GNSS | Global Navigation Satellite Service |
| GOSAT-GW | Greenhouse Gas Observing Satellite—Gasses and Water Cycle |
| GPM | Global Precipitation Measurement (NASA) |
| GPS | Global Positioning System |
| GSO | geostationary orbit |
| HartRAO | Hartebeesthoek Radio Astronomy Observatory |
| HCN | hydrogen cyanide |
| HCO+ | formylium |
| HF | high frequency [3-30 MHz] |
| HIBS | high-altitude platform stations as IMT Base Stations |
| HIRAX | Hydrogen Intensity and Real-time Analysis Experiment |
| ICI | Ice Cloud Imager (ESA) |
| IEEE | Institute of Electrical and Electronics Engineers |
| IFOV | instantaneous field of view |
| IMO | International Maritime Organization |
| IMT | International Mobile Telecommunications |
| IRAM | Institute for Radio Astronomy in the Millimeter Range |
| ISRO | Indian Space Research Organization |
| ITU | International Telecommunication Union |
| JASON | Joint Altimetry Satellite Oceanography Network |
| JAXA | Japan Aerospace Exploration Agency |
| JCMT | James Clark Maxwell Telescope |
| JPSS | Joint Polar Satellite System |
| KP | Kitt Peak |
| KVN | Korean VLBI Network |
| LEO | low Earth orbit |
| LMS | land mobile service |
| LMT | Large Millimeter Telescope |
| LOFAR | Low Frequency Array |
| LoFASM | Low Frequency All Sky Monitor |
| LWA | Long Wavelength Array |
| MENA | Middle East and North Africa |
| MERLIN | Multi-Element Radio Linked Interferometer Network |
| MicroMAS | Microsized Microwave Atmospheric Satellite |
| MLS | Microwave Limb Sounder |
| MSS | Mobile-Satellite Service |
| MTVZA-GY | “Module for Temperature and Humidity Sounding of the Atmosphere – G.Ya.Guskov” (Russian) |
| MWA | Murchison Widefield Array |
| MWI | Microwave Imager |
| MWR | Microwave Radiometer |
| MWRI | Microwave Radiation Imager |
| NANTEN2 | Second Nanten (南天, Southern Sky) telescope |
| NASA | National Aeronautics and Space Administration |
| NenuFAR | New Extension in Nançay Upgrading LOFAR |
| NEO | near Earth objects |
| NEXRAD | Next Generation Weather Radar |
| ngVLA | Next Generation Very Large Array |
| NISAR | NASA ISRO SAR |
| NOAA | National Oceanic and Atmospheric Administration |
| NOEMA | Northern Extended Millimeter Array |
| NPOESS | National Polar Orbiting Environmental Satellite |
| NPP | NPOESS Preparatory Program |
| NRAO | National Radio Astronomy Observatory |
| NSF | National Science Foundation |
| NSOAS | National Satellite Ocean Application Service (China) |
| OOBE | out-of-band emission |
| ORFEES | Observation Radiospéctrale pour FEDOME et les Etudes des Eruptions Solaires |
| OSCAT | OceanSat Scatterometer |
| PALSAR | Phased Array Type L-Band SAR |
| POLARBEAR | Name of a CMB experiment, formerly an acronym |
| QTT | Qitai Radio Telescope |
| RA.769 | Recommendation ITU-R RA.769 contains threshold levels considered harmful to RAS |
| RAS | Radio Astronomy Service |
| RF | radio frequency |
| RFI | radio frequency interference |
| RNSS | Radionavigation-Satellite Service |
| RR | Radio Regulation |
| RR 5.149 | Footnote RR 5.149 lists frequency bands for which Administrations are urged to take all practicable steps to protect radio astronomy |
| RR 5.340 | Footnote RR 5.340 lists frequency bands for which all emissions are prohibited |
| RRL | Radio Recombination Line |
| RS.2017 | Recommendation ITU-R RS.2017 contains threshold levels considered harmful to EESS |
| SAOCOM | Satélite Argentino de Observación Con Microondas |
| SAR | Synthetic Aperture Radar |
| SHF | super high frequency [3–30 GHz] |
| SIRAL | SAR Interferometric Radar Altimeter |
| SKA | Square Kilometre Array |
| SMA | Submillimeter Array |
| SMAP | Soil Moisture Active Passive |
| SMOS | Soil Moisture and Ocean Salinity |
| SMR | Submillimeter Radiometer |
| SMT | Sub-Millimeter Telescope (ARO) |
| spfd | spectral power flux density |
| SPT | South Pole Telescope |
| SRAL | Synthetic Aperture Radar Altimeter |
| SRS | Space Research Service |
| SSM/I | Special Sensor Microwave Imager |
| SSMIS | Special Sensor Microwave Imager/Sounder |
| SWE | snow water equivalent |
| SWIM | Surface Waves Investigation and Monitoring |
| SWOT | Surface Water and Ocean Topography |
| TGRS | Transactions on Geoscience and Remote Sensing |
| TMI | TRMM Microwave Imager |
| TRAO | Taeduk Radio Astronomy Observatory |
| TRMM | Tropical Rain Fall Measurement Mission |
| TROPICS | Time-Resolved Observations of Precipitation Structure and Storm Intensity with a Constellation of Smallsats |
| TWICE | Tropospheric Water Vapor and Cloud Ice |
| UAS | unmanned aircraft system |
| UHF | ultra high frequency [300–3000 MHz] |
| USAID | U.S. Agency for International Development |
| USDA | U.S. Department of Agriculture |
| USGS | U.S. Geological Survey |
| VERA | VLBI Exploration of Radio Astrometry |
| VHF | very high frequency [30-300 MHz] |
| VLA | Very Large Array |
| VLBA | Very Long Baseline Array |
| VLBI | Very Long Baseline Interferometry |
| VLF | very low frequency [3-30 kHz] |
| WISM | Wideband Instrument for Snow Measurements |
| WRC | World Radiocommunication Conference |
| WSF | Weather Satellite Follow-on |
| WSR | Weather Surveillance Radar |