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The history of synthetic-aperture radar begins in 1951, with the invention of the technology by mathematician Carl A. Wiley, and its development in the following decade. Initially developed for military use, the technology has since been applied in the field of planetary science.
After the war, radar use was widened to numerous fields, including civil aviation, marine navigation, radar guns for police, meteorology, and medicine. Key developments in the post-war period include the travelling wave tube as a way to produce large quantities of coherent microwaves , the development of signal delay systems that led to phased ...
Although some references to SARs have characterized them as "radar telescopes", their actual optical analogy is the microscope, the detail in their images being smaller than the length of the synthetic aperture. In radar-engineering terms, while the target area is in the "far field" of the illuminating antenna, it is in the "near field" of the ...
The M51 Skysweeper (Gun, M51, Antiaircraft or Gun automatic, 75-mm T83E6, and E7, recoil mechanism, and loader rammer) was an anti-aircraft gun deployed in the early 1950s by both the U.S. Army and U.S. Air Force. It was the first such gun to combine a gun laying radar, analog computer (director) and an autoloader on a single carriage.
Kennesaw, Georgia. Kennesaw has the most well-known gun mandate in the country. In 1982, a law was passed requiring heads of households to own at least one firearm. ... Nucla passed what they call ...
This is a list of properties and districts in Fulton County, Georgia that are listed on the National Register of Historic Places (NRHP). It covers most of the NRHP properties in Atlanta; other Atlanta listings are covered in National Register of Historic Places listings in DeKalb County, Georgia.
To test these radar detectors, I rented a radar gun and went to a deserted community-college campus in Southern California on a weekend. My assistant pointed a K-band radar gun at my test car, a ...
Gufo radar – Italian naval search radar (official designation EC3/ter) employed by the Regia Marina. Operational from 1942 to 1943. H.F. D/F (High Frequency Direction Finding). [8] – provided a radio position fix for the RAF up to 100 miles from the transmitters in Britain. The system was based on voice communications and was used for ...