The Long Range Discrimination Radar (LRDR) that is planned for operational service in Alaska in 2020 is part of the United States's Ground-Based Midcourse Defense anti-ballistic missile system. The main contractor is Lockheed Martin, under a US$784 million contract from the Missile Defense Agency in October 2015.
LDLR is a Gallium Nitride (GaN)-based, solid-state Active Electronically Scanned Array (AESA) radar.
Construction in Alaska for the LDLR is scheduled to begin in 2019, tentatively at Clear Air Force Station in central Alaska.
References
Long Range Discrimination Radar Wikipedia(Text) CC BY-SA