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- GPS has its origins in the Sputnik era when scientists were able to track the satellite with shifts in its radio signal, known as the “Doppler Effect,” which became the foundational idea for modern GPS12. The GPS project was started by the U.S. Department of Defense in 1973, and the first prototype spacecraft was launched in 197834. The full constellation of 24 satellites became operational in 199334. At first, GPS available for civilian use was not very accurate, but it has since improved4.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.GPS has its origins in the Sputnik era when scientists were able to track the satellite with shifts in its radio signal, known as the “Doppler Effect,” which became the foundational idea for modern GPS.www.nasa.gov/directorates/somd/space-communic…GPS has its origins in the Sputnik era when scientists were able to track the satellite with shifts in its radio signal known as the “Doppler Effect.” The United States Navy conducted satellite navigation experiments in the mid 1960’s to track US submarines carrying nuclear missiles.www.nasa.gov/general/global-positioning-system-h…The GPS project was started by the U.S. Department of Defense in 1973. The first prototype spacecraft was launched in 1978 and the full constellation of 24 satellites became operational in 1993.en.wikipedia.org/wiki/Global_Positioning_SystemThe original GPS system began as a project of the U.S. military. The first experimental satellite was launched in 1978. By 1994, a full 24 GPS satellites were orbiting Earth. At first, GPS available for civilian, or nonmilitary, use was not very accurate. It would only locate a GPS receiver within about 300 meters (1,000 feet).www.nationalgeographic.org/encyclopedia/gps/
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