| Aviation, Astronomy, Defense and Space Technology |
| AEGIS |
Advanced Electronic Guidance and Instrumentation System |
| APC |
Armored Personnel Carrier |
| ASDE |
Airport Surface Detection Equipment (radar) |
| ASR |
Airport Surveillance Radar |
| ATCRBS |
Air Traffic Control Radar Beacon System |
| ATIS |
Automated Terminal Information System |
| AWOS |
Automated Weather Observation System |
| DARPA |
Defense Advanced Research Projects Agency |
| DCP |
Data Collection Platform (bouy, free-floating balloons, remote weather stations etc.) |
| DECM |
Defensive Electronic Counter Measures |
| DME |
Distance Measuring Equipment (GPS) |
| DoD |
Department of Defense (USA) |
| DSCS |
Defense Satellite Communications System |
| DSN |
Deep Space Network |
| ELB |
Emergency Locator Beacon |
| ELT |
Emergency Locator Transmitter |
| EPIRB |
Emergency Position-Indicating Radio Beacon |
| FLIR |
Forward-Looking Infra-Red |
| FRB |
Fast Radio Burst |
| GEO |
Geostationary Earth Orbit (communication satellites at orbit distance of about 35,651 KM above equator) |
| GIG |
Global Information Grid (a DoD network) |
| GMDSS |
Global Maritime Distress and Safety System (IMO) |
| GOES |
Geostationary Operational Environment Satellite |
| GPS |
Global Positioning System/Satellite |
| HRPT |
High Resolution Picture Transmission (satellite aerial photography) |
| IFOG |
Interferometric Fiber Optic Gyroscope |
| IMO |
International Maritime Organization |
| INMARSAT |
International Maritime Satellite Organization |
| INS |
Inertial Navigation Systems |
| INS |
Inertial Navigation Systems |
| JWICS |
Joint Worldwide Intelligence Communications System (DoD) |
| LANTRIN |
Low Altitude Navigation and Targeting Infrared for Night |
| LEO |
Low Earth Orbit (communication satellites at orbit distance of about 400 to 2,000 KM above earth) |
| LORAN |
Long Range Navigation |
| MEO |
Medium Earth Orbit (communication satellites at orbit distance of about 8,000 to 16,000 KM above earth) |
| NASA |
National Aeronautics and Space Administration (USA) |
| NEAR |
Near Earth Asteroid Rendezvous |
| NEO |
Near Earth Object |
| NEXRAD |
Next-Generation Doppler Radar |
| NIPRNet |
Non-Classified Internet Protocol Router Network (DoD; secret SIPRNet) |
| NPOESS |
National Polar Orbiting Environment Satellite System |
| OCXO |
Oven-Controlled Crystal Oscillator |
| OT&E |
Operational Test & Evaluation (DoD process) |
| PLB |
Personal Locator Beacon |
| POES |
Polar-Orbiting Meteorological Satellite |
| RACON |
Radar Beacon |
| IFOG |
Resonator Fiber Optic Gyroscope |
| RHAW |
Radar Homing and Warning |
| RLG |
Ring Laser Gyroscope |
| SAR |
Search and rescue |
| SAR |
Synthetic Aperture Radar |
| SARSAT |
Search and Rescue Satellite |
| SDO |
Solar Dynamics Observatory |
| SETI |
Search for ExtraTerrestrial Intelligence |
| SIPRNet |
Secret Internet Protocol Router Network (DoD; Non-classified NIPRNet) |
| SGLS |
Satellite Ground Link Subsystem |
| SSR |
Secondary Surveillance Radar |
| STACSAR |
Small Tactical Synthetic Aperture Radar |
| TACAN |
Tactical Air Navigation |
| TDRSS |
Tracking and Data Relay Satellite System |
| TESAR |
Tactical Endurance Radar |
| TFR |
Terrain-Following Radar |
| TT&C |
Tracking, Telemetry, and Command |
| UAT |
Universal Access Transceiver |
| UAV |
Unmanned Aerial Vehicle (drone) |
| WAAS |
Wide Area Augmentation System (GPS) |
| WGS |
Wideband Gapfiller Satellite |
| ADS-B |
Automatic Dependent Surveillance-Broadcast system |