List of Acronyms and Abbreviations
| AEW | Airborne Early Warning |
| am | Attometer (10-18 meter) |
| AMTI | Airborne Moving-Target Indication |
| ARSR | Air Route Surveillance Radar |
| ASDE | Airport Surface Detection Equipment |
| ASR | Airport Surveillance Radar |
| ATC | Air Traffic Control |
| BBA-97 | Balanced Budget Act of 1997 |
| BSS | Broadcast Satellite Service |
| CLOUDSAT | Cloud Satellite |
| cm | Centimeter (10-2 meter) |
| CW | Continuous Wave |
| DEMS | Digital Electronic Message Service |
| DOD | Department of Defense |
| DOE | Department of Energy |
| DOI | Department of the Interior |
| DOJ | Department of Justice |
| EESS | Earth Exploration-Satellite Service |
| EHF | Extra High Frequency |
| FAA | Federal Aviation Administration |
| FAS | Frequency Assignment Subcommittee |
| FCC | Federal Communications Commission |
| fm | Femtometer (10-15 meter) |
| FM | Frequency Modulation |
| FM-CW | Frequency-Modulated Continuous-wave |
| GHz | Gigahertz (109 Hertz) |
| HF | High Frequency |
| HF OTH | High Frequency Over-the-Horizon |
| ICAO | International Civil Aviation Organization |
| IFF | Identification, Friend or Foe |
| IMO | International Maritime Organization |
| IRAC | Interdepartment Radio Advisory Committee |
| ISAR | Inverse synthetic aperture radar |
| ITU | International Telecommunication Union |
| kHz | Kilohertz (103 Hertz) |
| MHz | Megahertz (106 Hertz) |
| mm | Millimeter (10-3 meter) |
| MTI | Moving-Target Indication |
| NAS | National Airspace System |
| NASA | National Aeronautics and Space Administration |
| NATO | North Atlantic Treaty Organization |
| NEXRAD | Next Generation Weather Radar |
| nm | Nanometer (10-9 meter) |
| NMD | National Missile Defense |
| NOAA | National Oceanic and Atmospheric Administration |
| NORAD | North American Air Defense |
| NSF | National Science Foundation |
| NTIA | National Telecommunications and Information Administration |
| OBRA-93 | Omnibus Budget Reconciliation Act of 1993 |
| OMB | Office of Management and Budget |
| PAR | Precision Approach Radars |
| pm | Picometer (10-12 meter) |
| PRR | Pulse Repetition Rate |
| PW | Pulse Width |
| RAF | Royal Air Force |
| RDT&E | Research, Development, Test, and Evaluation |
| RPV | Remotely Piloted Vehicle |
| SAR | Synthetic Aperture Radar |
| SBR | Spaceborne Radar |
| SHF | Super High Frequency |
| SLAR | Side-looking Airborne Radar |
| SPASUR | Space Surveillance |
| SPS | Spectrum Planning Subcommittee |
| SR | Space Research |
| SRTM | Shuttle Radar Topography Mission |
| TDWR | Terminal Doppler Weather Radar |
| THAAD | Theater High Altitude Area Defense System |
| THZ | Terahertz (1012 Hertz) |
| TOPEX | Ocean Topography Experiment |
| TRMM | Tropical Rain Measuring Mission |
| TWS | Track-While-Scan |
| UHF | Ultra High Frequency |
| USDA | U.S. Department of Agriculture |
| VHF | Very High Frequency |
| VTS | Vessel Traffic System |
| WARC | World Administrative Radio Conference |
| WRC | World Radiocommunication Conference (formerly WARC) |
| µm | Micrometer (10-6 meter) |
| 2-D | 2-Dimensional |
| 3-D | 3-Dimensional |