The NAVSTAR global positioning system is a satellite-based positioning system implemented and operated by the US Department of Defense (DOD). NAVSTAR stands for Navigation System using Time and Ranging, and it was designed to provide continuous, all-weather navigation and positioning capabilities throughout the world. Work on the system began in 1973 as a result of the merger of the US Navy’s Timaton Program and the US Air Force’s 621B Project. These two programs had been established in the mid-1960s to develop a passive navigation system using measured ranges.
KeywordsReference Station Mobile Station Carrier Phase Measurement Clock Bias Navigation Message
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