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SG radar
American surface-search radar From Wikipedia, the free encyclopedia
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The SG radar was a US Navy surface-search radar for large warships developed during the Second World War. The first operational set was installed aboard the heavy cruiser USS Augusta in April 1942.[1] It was the first Navy radar to use S-band (microwave) frequencies [2] and the first surface-search radar to be equipped with a plan position indicator (PPI), the ancestor of virtually all modern radar displays.
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The radar was developed by Raytheon under the guidance of the MIT Radiation Laboratory and Naval Research Laboratory using the cutting-edge multicavity magnetron technology developed in Britain and brought to the US by the Tizard Mission.[2] The prototype was tested at sea aboard the destroyer USS Semmes in May 1941.[3] It saw extensive use during World War 2, particularly in the Pacific Theater, with about 1000 units produced during the war, and remained in service for about 2 decades.[2] Designed for installation on destroyers and larger ships to search for low-flying warplanes and surface ships, it achieved greatly improved surface coverage and detection of aircraft compared with previous lower frequency radars.[2] It also proved a superior navigation aid, making possible the detection of buoys and shoreline at night or bad weather.
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