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Identification, friend or foe ( IFF) is a combat identification system designed for command and control. It uses a transponder that listens for an interrogation signal and then sends a response that identifies the broadcaster. IFF systems usually use radar frequencies, but other electromagnetic frequencies, radio or infrared, may be used. [ 1]
The aviation transponder interrogation modes are the standard formats of pulsed sequences from an interrogating Secondary Surveillance Radar (SSR) or similar Automatic Dependent Surveillance-Broadcast (ADS-B) system. The reply format is usually referred to as a "code" from a transponder, which is used to determine detailed information from a ...
3.4 lb (1.5 kg) The Integrated Visual Augmentation System ( IVAS) is an augmented reality headset being developed by Microsoft for the United States Army. It is intended to improve situational awareness by overlaying sensor imagery and other information on the soldier's field of view. Originally developed for infantry, it is also being adapted ...
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VHF Data Link. The VHF Data Link or VHF Digital Link ( VDL) is a means of sending information between aircraft and ground stations (and in the case of VDL Mode 4, other aircraft). Aeronautical VHF data links use the band 117.975–137 MHz assigned by the International Telecommunication Union to Aeronautical mobile (R) service.
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Brian Atwater, a U.S. Geological Survey scientist emeritus, shows off tsunami-deposited mud. COPALIS BEACH, WASH. — When Japan issued its first-ever “megaquake” warning last week, Harold ...
Kevin Pillar hit a two-run double in the eighth as Los Angeles rallied against Oakland's bullpen, and the Angels beat the Athletics 8-5 on Sunday in likely their final game ever at the Coliseum.