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AN/SPQ-11
US Navy PESA space and missile tracking radar From Wikipedia, the free encyclopedia
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The AN/SPQ-11 Cobra Judy was a passive electronically scanned array (PESA) radar found on the USNS Observation Island (T-AGM-23) missile range instrumentation ship.
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It was used for space tracking, ballistic missiles tracking and other instrumentation. Cobra Judy was the US Air Force code name for the afloat phased-array radar designed with the primary mission of monitoring Soviet missile tests operating in conjunction with land based phased-array radar Cobra Dane and Cobra Ball aircraft.[1] Cobra Judy was replaced by the Cobra Judy Replacement (CJR) project in April 2014.[2]
In accordance with the Joint Electronics Type Designation System (JETDS), the "AN/SPQ-11" designation represents the 11th design of an Army-Navy electronic device for surface ship special radar system.[3][4] The JETDS system also now is used to name all Department of Defense electronic systems.
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Replacement
The original Cobra Judy platform, USNS Observation Island, was taken out of service and stricken from the Naval Vessel Register 31 March 2014.[5] The same day, the Cobra Judy Replacement program whose radars are called Cobra King, reached initial operating capability (IOC) aboard USNS Howard O. Lorenzen (T-AGM-25). USNS Howard O. Lorenzen, together with her Cobra King radar system, were declared operational in August 2014.[6] According to Naval Sea Systems Command (NAVSEA), the US Air Force also assumed operational and sustainment responsibilities for the ship.[7] The inertial navigation system for the antenna stabilization and alignment had been provided by iMAR Navigation GmbH. Raytheon manufactures and maintains the CJR's X and S-band radars.[8]
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