The Long Range Discrimination Radar (LRDR) in Alaska is part of the United States's Ground-Based Midcourse Defense anti-ballistic missile system.
[1] LRDR is a gallium nitride (GaN)-based, solid-state active electronically scanned array (AESA) early-warning radar[1] that allows for continuous coverage, even when it is undergoing maintenance.
The multi-purpose GaN device used on the prototype version of the LRDR is from the Japanese electronics company Fujitsu, according to Lockheed Martin.
[5] In late February 2021, the Missile Defense Agency said that the radar installation was underway, with Initial Operational Capability to be achieved in 2021.
[10] Lockheed Martin promoted this version of radar as the AN/SPY-1 refurbishment program to the US Navy to extend the lifespan of the Ticonderoga-class cruiser and Arleigh Burke-class destroyer to beyond the 2040s.