air route surveillance radar
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air route surveillance radar (ARSR)
A radar facility remotely connected to an air route traffic control center and used primarily to detect and display aircraft positions while en route between terminal areas. The radar is used to provide radar air traffic control services when aircraft are within the range of the facility. In some instances, ARSR may enable an ARTCC (air route traffic control center) to provide terminal radar services similar to but usually more limited than those provided by a radar approach control. An airport surveillance radar does not normally provide aircraft elevation data. Normal ranges of these radars are about 200 to 300 NM.