page_title: Airport surveillance radar
section_title: ASR-11 or Digital Airport Surveillance Radar (DASR)
hierarchical_section_title: Airport surveillance radar / Types / ASR-11 or Digital Airport Surveillance Radar (DASR)
caption_attribution_description: German ASR 910, a derivate of AN/TPN-24, Reference-Radartower in Neubrandenburg (Western-Pommerania/Germany)
context_page_description: An airport surveillance radar 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. At large airports it typically controls traffic within a radius of 60 miles of the airport below an elevation of 25,000 feet. The sophisticated systems at large airports consist of two different radar systems, the primary and secondary surveillance radar. The primary radar typically consists of a large rotating parabolic antenna dish that sweeps a vertical fan-shaped beam of microwaves around the airspace surrounding the airport. It detects the position and range of aircraft by microwaves reflected back to the antenna from the aircraft's surface. In the US the primary radar operates at a frequency of 2.7 - 2.9 GHz in the S band with a peak radiated power of 25 kW and an average power of 2.1 kW.
context_section_description: The Digital Airport Surveillance Radar (DASR) is the new generation of fully digital radar that is being developed to replace the current analog systems. The US Air Force Electronics Systems Center, the US Federal Aviation Administration, US Army and the US Navy procured DASR systems to upgrade existing radar facilities for US Department of Defense (DoD) and civilian airfields. The DASR system detects aircraft position and weather conditions in the vicinity of civilian and military airfields. The civilian nomenclature for this radar is ASR-11. The ASR-11 will replace most ASR-7 and some ASR-8.  The military nomenclature for the radar is AN/GPN-30. The older radars, some up to 20 years old, are being replaced to improve reliability, provide additional weather data, reduce maintenance cost, improve performance, and provide digital data to new digital automation systems for presentation on air traffic control displays. The Iraqi Air Force has received the DASR system.
caption: ASR 910, a German derivate of AN/TPN-24, Radartower in Neubrandenburg (Western-Pomerania/ Germany)
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