AN/FPQ-16

The AN/FPQ-16, also known as the Perimeter Acquisition Radar Attack Characterization System (PARCS), is a UHF band (420-450 MHz) phased-array early warning radar manufactured by General Electric in the United States. Located at Cavalier Space Command Base in North Dakota (48°43’30.0" N 97°54’00.0" W), it tracks over 20,000 objects daily, ranging from satellites to space debris, with an instrumented range of 3,700 km and a range resolution of 50 m. Activated in 1975 as part of the US Army’s Safeguard anti-ballistic missile system, it now functions as a key component of the missile attack warning system after modernization. The radar, along with its computer, communications equipment, and operations rooms, is housed in a reinforced multi-story concrete building; its single-faced phased array, comprising 6,888 radiating elements fed by 128 traveling wave tubes, is angled at 35 degrees and pointed northward over Hudson Bay, utilizing a linear frequency modulated waveform with a pulse compression ratio of 1:100.

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