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  2. 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_System
    GPS, or the Global Positioning System, was invented by the U.S. Department of Defense (D.O.D) and Ivan Getting, and cost taxpayers $12 billion. Eighteen satellites—six in each of three orbital planes spaced 120 degrees apart—and their ground stations formed the original GPS.
    www.thoughtco.com/history-of-the-global-positionin…
    History of the Global Positioning System (GPS) The origins of GPS dates back to the Cold War when the Soviet Union launched the Sputnik I satellite, heralding the beginning of the space race. What started off as a method of studying the Earth from space quickly grew into a universal technology utilized by nearly every country in the world.
    www.geotab.com/blog/gps-satellites/
    NASA 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…
     
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    Global Positioning System - Wikipedia

    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. After Korean Air Lines Flight 007 was shot down when it mistakenly entered Soviet airspace, President … See more

    The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radio navigation system owned by the United States government and operated by the See more

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    The GPS satellites carry very stable atomic clocks that are synchronized with one another and with the reference atomic clocks at the ground control stations; any drift of the clocks … See more

    While originally a military project, GPS is considered a dual-use technology, meaning it has significant civilian applications as well. See more

    Problem statement
    The receiver uses messages received from satellites to determine the satellite positions and time sent. The x, y, and z components of satellite position and the time sent (s) are designated as [xi, yi, zi, si] where the … See more

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    The GPS project was launched in the United States in 1973 to overcome the limitations of previous navigation systems, combining ideas from several predecessors, … See more

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    The current GPS consists of three major segments. These are the space segment, a control segment, and a user segment. The See more

    The navigational signals transmitted by GPS satellites encode a variety of information including satellite positions, the state of the internal clocks, and the health of the network. … See more

     
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  4. List of GPS satellites - Wikipedia

  5. Brief History of GPS | The Aerospace Corporation

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        The U.S. Space Force 's Global Positioning System was the first global satellite navigation system and the first to be provided as a free global service. A satellite navigation or satnav system is a system that uses satellites to provide …

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        History and Development. The Global Positioning System, formally known as the Navstar Global Positioning System, was initiated as a joint civil/military technical program in 1973.

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        May 18, 2018 — From 1957 to today, discover the history of GPS over the years. When Russia launched their satellite Sputnik in 1957, the U.S. may have been disappointed, but the launch gave way to a major American invention: GPS.

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