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Global Positioning System: Difference between revisions
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==== Control segment ==== | ==== Control segment ==== | ||
The flight paths of the satellites are tracked by US Air Force monitoring stations in Hawaii, Kwajalein, | The flight paths of the satellites are tracked by US Air Force monitoring stations in Hawaii, Kwajalein, Ascension Island, [[Diego Garcia]], and Colorado Springs, Colorado, along with monitor stations operated by the [[National Geospatial-Intelligence Agency]] (NGA).<ref>US Coast Guard [http://www.navcen.uscg.gov/gps/gps_news_090905.htm General GPS News 9-9-05]</ref> The tracking information is sent to the [[Air Force Space Command]]'s master control station at [[Schriever Air Force Base]], Colorado Springs, Colorado, which is operated by the [[2d Space Operations Squadron]] (2 SOPS) of the United States Air Force (USAF). 2 SOPS contacts each GPS satellite regularly with a navigational update (using the ground antennas at Ascension Island, Diego Garcia, Kwajalein, and Colorado Springs). These updates synchronize the atomic clocks on board the satellites to within one [[1 E-6 s|microsecond]] and adjust the [[ephemeris]] of each satellite's internal orbital model. The updates are created by a [[Kalman Filter]] which uses inputs from the ground monitoring stations, [[space weather]] information, and other various inputs.<ref>[[USNO]]. [http://tycho.usno.navy.mil/gpsinfo.html NAVSTAR Global Positioning System]. Accessed [[May 14]], [[2006]].</ref> | ||
[[Image:GPS Receivers.jpg|thumb|left|GPS receivers come in a variety of formats, from devices integrated into cars, phones, and watches, to dedicated devices such those shown here from manufacturers Trimble, Garmin and Leica (left to right).]] | [[Image:GPS Receivers.jpg|thumb|left|GPS receivers come in a variety of formats, from devices integrated into cars, phones, and watches, to dedicated devices such those shown here from manufacturers Trimble, Garmin and Leica (left to right).]] | ||
