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An/spy-1 RadarThe AN/SPY-1 is a US naval radar system manufactured by Lockheed Martin. A 4 MW phased array system it is a key component of the Aegis combat system. The system was first installed in 1973 and entered active service in 1983 as the SPY-1A on the USS Ticonderoga (CG-47). The 1A was installed up to CG-58, with the 1B upgrade first installed on the USS Princeton (CG-59) in 1986. The upgraded 1B(V) was retro-fitted to existing craft from CG-59 up to the last, CG-73. The SPY-1D was first installed on the USS Arleigh Burke (DDG-51) in 1991, it is a variant of the 1B to fit the Arleigh Burke class. The 1D(V), the Littoral Warfare Radar, was an upgrade introduced in 1998 for high clutter near-coast operations, an area were the earlier 'blue water' systems were especially weak. The SPY-1F is an even smaller version of the 1B to fit frigates. It is not used by the US Navy but has been exported. . Due to weaknesses against low altitude threats the Aegis radar is being augmented with the AN/SPQ-9B. Aegis vessels also use the AN/SPS-49 air search radar, the AN/SPS-55 surface search radar, and the AN/SPQ-9A and AN/SPG-62 fire control radars.
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