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Aviation, Astronomy, Defense and Space Technology
 AEGIS  Advanced Electronic Guidance and Instrumentation System
 APC  Armored Personnel Carrier
 AoA  Angle of Attack
 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


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