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It is one of the global navigation satellite systems (GNSS) that provide geolocation and time information to a GPS receiver anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites. [4]
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The GPS constellation is nominally designed and operated, consists of six orbital planes, with a minimum of four satellites per plane. GPS satellites are launched from Cape Canaveral Air Force Station, Fla., into nearly circular 11,000-mile altitude orbits. While circling the earth, the systems transmit signals on two different L-band frequencies.
Nov 13, 2012 · You need four satellites to determine the 3D position, in the same way that you need at least three points to determine a third point on a plane, given only distances. Once you have the position, you only need one satellite to determine the time. – naught101. Dec 9, 2012 at 5:29.
Satellite Navigation is based on a global network of satellites that transmit radio signals from medium earth orbit. Users of Satellite Navigation are most familiar with the 31 Global Positioning System (GPS) satellites developed and operated by the United States.
Jun 28, 2022 · The satellites in the GPS constellation are arranged into six equally-spaced orbital planes surrounding the Earth. Each plane contains four "slots" occupied by baseline satellites. This 24-slot arrangement ensures users can view at least four satellites from virtually any point on the planet.
Sep 25, 2023 · Today the GPS satellite constellation (the space segment) consists of over 30 operational satellites, each equipped with redundant atomic clocks and tracked by a ground control network (the control segment).
There are currently 31 operational satellites in the 24-slot constellation (6 orbits x 4 slots) These satellites orbit in 1 of 6 orbital planes. These planes have an altitude of ~ 20,200 km. Each satellite orbits the Earth twice a day. In 2011, the Air Force completed the “Expandable 24,” a constellation expansion.
