The COBRA DANE radar is a single faced ground-based,

The COBRA DANE radar is a single faced ground-based, L-band phased-array radar
located at Eareckson Air Station, Shemya, Alaska. The primary mission of COBRA DANE is to collect radar metric and signature data on foreign ballistic missile events. Additional missions include collecting space surveillance data on new foreign launches and satellites in low-earth orbit. The radar has a 95-foot diameter phased array and the capability to track and record data on as many as 120 objects simultaneously.