LRDR

The Long Range Discrimination Radar (LRDR) is an S-band, multi-mission, multi-face early warning radar manufactured by Lockheed Martin in the United States. Located at Clear Space Force Station, Alaska, it provides search, track, and discrimination capabilities for homeland defense against missile threats in the Pacific theater, integrated into the missile defense system via the Command and Control, Battle Management and Communications (C²BMC) element. The LRDR also supports space domain awareness by monitoring Earth-orbiting satellites, detecting, tracking, and identifying active or inactive satellites, spent rocket bodies, and fragmentation debris, with an instrumented range of 7,000 to 12,000 km. Each of its active phased array antenna surfaces measures 15.24 meters (60 feet) high and 15.24 meters (60 feet) wide, housing ten stacked antenna modules, each approximately 12 meters (40 feet) high and 5 meters (16 feet) wide. These modules contain slots for almost 288 subarray suites (SAS) of dual-polarization transmit/receive (T/R) modules, manufactured using Gallium Nitride (GaN) technology, with the number of fitted SAS depending on the module's position. Construction began in September 2017, achieving operational readiness by 2022. The Homeland Defense Radar – Hawaii (HDR-H) is a scaled-down, single-face variant of the LRDR.

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