AN/FPS-108 “Cobra Dane”

The AN/FPS-108 "Cobra Dane" is a large, L-band (1175-1375 MHz) phased-array early warning radar system manufactured by Raytheon E-Systems for the United States Air Force (USAF) Program 633A. Located at Shemya Air Force Base in the Aleutian Islands, it was designed for the detection and tracking of intercontinental ballistic missiles (ICBMs), submarine-launched ballistic missiles (SLBMs), and satellites, replacing the AN/FPS-17 and AN/FPS-80 radars. Its fixed phased array measures 94.5 feet (approximately 30 meters) in diameter, comprising 34,768 elements, with 15,360 active radiating elements, and can scan up to 60 degrees off its center axis. The system has an instrumented range of 46,000 km for space tracking, can track up to 100 objects simultaneously for data collection on missile development flights (providing precise data on up to 20 targets), and can track 200 targets for early warning, providing predicted impact locations to NORAD Headquarters. The radar utilizes linear frequency modulated (LFM) intrapulse modulation with a 200 MHz up-chirp bandwidth, a time-bandwidth product of 200,000, and a range resolution of 115 cm, powered by 12 transmitting groups, each with eight QKW-1723 traveling-wave tubes (175 kW peak, 10.5 kW average per tube).

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