Air Route Surveillance Radar

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The Air Route Surveillance Radar (ARSR-4) is used by Homeland defense and the Federal Aviation Administration to control airspace within and around the borders of the United States.

The ARSR-4 is the FAA's newest (late 80s, early 90s) addition to the "Long Range" series of radars, search radars with a range of at least 200NMI. The Westinghouse system is solid state and has a 250NMI range. A Beacon system, typically an ATCBI-5, but increasingly ATCBI-6M, will be installed along with an ARSR-4. However, the ARSR-4 is capable of determining aircraft altitude independently of its associated Beacon (albeit less accurately).

ARSR-4 systems are installed along the borders and coastal areas of the CONUS.