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- The history of GPS can be summarized as follows:
- 1973: The U.S. Department of Defense started the GPS project.
- 1978: The first prototype spacecraft was launched.
- 1993: The full constellation of 24 satellites became operational.
- Civilian use: Initially limited by broadcasting Selective Availability (SA)1.
- Origins: GPS dates back to the Cold War and the space race2.
- 1973: The Defense Department combined competing satellite navigation systems to create the NAVSTAR Global Positioning System (GPS)3.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.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. Civilian use by the United States military was limited to an average of 100 meter uncertainty in location by broadcasting Selective Availability (SA).en.wikipedia.org/wiki/Global_Positioning_SystemThe 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/In 1973, the Defense Department combined its competing satellite navigation systems. The new joint program under the Air Force was called the NAVSTAR Global Positioning System, or GPS. It introduced synchronized time from space, provided by onboard atomic clocks.timeandnavigation.si.edu/satellite-navigation/gps - See moreSee all on Wikipedia
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 Ronald Reagan … 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
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 moreThe 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
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
Wikipedia text under CC-BY-SA license A Brief History of GPS - Aerospace Corporation
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