page_title: AN/SPQ-11
hierarchical_section_title: AN/SPQ-11
caption_attribution_description: English: A starboard quarter view of the missile range instrumentation ship USNS Observation Island (T-AGM-23) underway during exercise Cobra Judy, an exercise to test the ship's seaworthiness. Observation Island, which has been undergoing modifications, is now equipped with a phased-array radar turret on its stern.
context_page_description: The AN/SPQ-11 Cobra Judy was a PESA radar found on the USNS Observation Island missile range instrumentation ship.
  It was used for space tracking, ballistic missiles tracking and other instrumentation. Cobra Judy was the sea component of the COBRA program for monitoring missile launches and outer space. Cobra Judy was replaced by the Cobra Judy Replacement in April 2014.
context_section_description: The AN/SPQ-11 Cobra Judy was a PESA radar found on the USNS Observation Island (T-AGM-23) missile range instrumentation ship.
  It was used for space tracking, ballistic missiles tracking and other instrumentation. Cobra Judy was the sea component of the COBRA program for monitoring missile launches and outer space. Cobra Judy was replaced by the Cobra Judy Replacement (CJR) in April 2014.
caption: Aft view of the USNS Observation Island showing the location of the Cobra Judy array.
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