page_title: Naval Ocean Surveillance System
hierarchical_section_title: Naval Ocean Surveillance System
caption_attribution_description: English: A trio of NOSS satellites passes the Moon. Taken on 13th May 2008 from Dunsink Observatory, Dublin.
context_page_description: The Naval Ocean Surveillance System is a series of signals intelligence satellites that have conducted electronic signals intelligence for the U.S. Navy since the early 1970s. The first series of satellites were codenamed "White Cloud" or "PARCAE", while second and third-generation satellites have used the codenames "Ranger" and "Intruder".
  The system is operated by the U.S. Navy and its main purpose was tactical geolocation of Soviet Navy assets during the Cold War. The NOSS satellites operate in clusters in low Earth orbit to detect radar and other electronic transmissions from ships at sea and locate them using the Time Difference Of Arrival technique.
context_section_description: The Naval Ocean Surveillance System (NOSS) is a series of signals intelligence satellites that have conducted electronic signals intelligence for the U.S. Navy since the early 1970s. The first series of satellites were codenamed "White Cloud" or "PARCAE", while second and third-generation satellites have used the codenames "Ranger" and "Intruder".
  The system is operated by the U.S. Navy and its main purpose was tactical geolocation of Soviet Navy assets during the Cold War. The NOSS satellites operate in clusters in low Earth orbit to detect radar and other electronic transmissions from ships at sea and locate them using the Time Difference Of Arrival technique.
caption: A NOSS satellite Trio passes the Moon.
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