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  2. Airport surveillance radar - Wikipedia

    en.wikipedia.org/wiki/Airport_surveillance_radar

    Various modes exist from Mode 1 to 5 for military use, to Mode A, B, C and D, and Mode S for civilian use. Only Mode C transponders report altitude. Busy airports usually require all aircraft entering their airspace to have a mode C transponder which can report altitude, due to their strict requirements for aircraft altitude spacing; this is ...

  3. Air traffic control radar beacon system - Wikipedia

    en.wikipedia.org/wiki/Air_traffic_control_radar...

    Mode 3/A is used to identify each aircraft in the radar's coverage area. Mode C is used to request/report an aircraft's altitude. Two other modes, mode 4 and mode S, are not considered part of the ATCRBS system, but they use the same transmit and receive hardware. Mode 4 is used by military aircraft for the Identification Friend or Foe (IFF ...

  4. List of transponder codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Transponder_Codes

    Non-discrete mode A code reserved use in mode S radar/ADS-B environment where the aircraft identification will be used to correlate the flight plan instead of the mode A code. [1] US: Used exclusively by ADS-B aircraft to inhibit mode 3A transmission. [3] US: Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2.

  5. Traffic collision avoidance system - Wikipedia

    en.wikipedia.org/wiki/Traffic_collision...

    In 1981, the FAA decided to implement the Traffic Alert and Collision Avoidance System (TCAS), which was developed based on industry and agency efforts in the field of beacon-based collision avoidance systems and air-to-air discrete address communication techniques that used Mode S airborne transponder message formats.

  6. Near-field communication - Wikipedia

    en.wikipedia.org/wiki/Near-field_communication

    The initiator device provides a carrier field and the target device, acting as a transponder, communicates by modulating the incident field. In this mode, the target device may draw its operating power from the initiator-provided magnetic field. Active Both initiator and target device communicate by alternately generating their own fields.

  7. Boeing E-3 Sentry - Wikipedia

    en.wikipedia.org/wiki/Boeing_E-3_Sentry

    When deployed, the E-3 monitors an assigned area of the battlefield and provides information for commanders of air operations to gain and maintain control of the battle; while as an air defense asset, E-3s can detect, identify, and track airborne enemy forces far from the boundaries of the U.S. or NATO countries and can direct interceptor ...

  8. Transponder (satellite communications) - Wikipedia

    en.wikipedia.org/wiki/Transponder_(satellite...

    It simply means how many transponders would be used if the same total bandwidths used only 36 MHz transponders. [ 3 ] [ 4 ] [ 5 ] So, for example, the ARSAT-1 has 24 IEEE K u band transponders: 12 with a bandwidth of 36 MHz, 8 with 54 MHz, and 4 with 72 MHz, which totals to 1152 MHz, or 32 TPE (i.e., 1152 MHz divided by 36 MHz).

  9. Meteor (missile) - Wikipedia

    en.wikipedia.org/wiki/Meteor_(missile)

    The Meteor is a European active radar guided beyond-visual-range air-to-air missile (BVRAAM) developed and manufactured by MBDA.It offers a multi-shot capability (multiple launches against multiple targets), and has the ability to engage highly maneuverable targets such as jet aircraft, and small targets such as UAVs and cruise missiles in a heavy electronic countermeasures (ECM) environment ...