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2. Airport surveillance radar - Wikipedia

   en.wikipedia.org/wiki/Airport_surveillance_radar

   An airport surveillance radar (ASR) is a radar system used at airports to detect and display the presence and position of aircraft in the terminal area, the airspace around airports. It is the main air traffic control system for the airspace around airports.

3. Airport surveillance and broadcast systems - Wikipedia

   en.wikipedia.org/wiki/Airport_surveillance_and...

   The Airport Movement Area Safety System (AMASS) visually and aurally prompts tower controllers to respond to situations which potentially compromise safety. AMASS is an add-on enhancement to the host Airport Surface Detection Equipment Model 3 (ASDE-3) radar that provides automated aural alerts to potential runway incursions and other hazards.

4. ASR-11 - Wikipedia

   en.wikipedia.org/wiki/ASR-11

   ASR-11 is a Digital Airport Surveillance Radar (DASR,) an advanced radar system utilized by the United States as the next generation of terminal air traffic control. [1] The ASR-11 is an upgraded, advanced version of the previous ASR-9 radar.

5. ASR-9 - Wikipedia

   en.wikipedia.org/wiki/ASR-9

   ASR-9 is an airport surveillance radar system admitted into the National Airspace System (NAS), to be utilized by the Federal Aviation Administration to monitor civilian and commercial air traffic within the United States. Developed by Westinghouse, ASR-9 was the first radar system to display air traffic, and weather conditions simultaneously.

6. Air Route Surveillance Radar - Wikipedia

   en.wikipedia.org/wiki/Air_Route_Surveillance_Radar

   The Air Route Surveillance Radar is a long-range radar system. It is used by the United States Air Force and the Federal Aviation Administration to control airspace within and around the borders of the United States. The ARSR-4 is the FAA's most recent (late 1980s, early 1990s) addition to the "Long Range" series of radars.

7. Secondary surveillance radar - Wikipedia

   en.wikipedia.org/wiki/Secondary_surveillance_radar

   Secondary surveillance radar antenna (flat rectangle, top) mounted on an ASR-9 primary airport surveillance radar antenna (curved rectangle, bottom).. The need to be able to identify aircraft more easily and reliably led to another wartime radar development, the Identification Friend or Foe (IFF) system, which had been created as a means of positively identifying friendly aircraft from unknowns.