Earth Curvature and GPS Surveying Essay

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GPS is a system capable of providing position information anywhere on earth, a constellation of orbiting satellites, various orbits around the earth, NAVSTAR GPS, and it is also a user receivers acquired signal and determines its position.
GPS (Global Positioning System) is a triangulation-based technology which was developed by DOD that cost them $10 billion.


GPS is used mostly on land, sea and airborne navigation, also in surveying, geophysical exploration, mapping and geodesy, vehicle location system, farming and transportation systems. Also for telecommunication infrastructure applications include network timing and enhanced 999 for mobile users. It is also important to global delivery of precise and common time to fixe and mobile users.
In the user segment we find GPS user equipment that are portable and fixed and are used by military and civilian for navigation, surveying and GIS. In the control segment are also two uses. One is ground facilities which are responsible for: 1) satellite tracking, 2) telemetry, 3) orbit and ephemeris computations, 4) up-linking of the computed data, 5) supervising the daily management of the space segment, 6) five ground control stations (Monitor Stations), 7) one Master Control Station. The second use is the Master Control Station that: 1) receive tracking data from the monitor stations, 2) calculates satellites ephemeris, 3) adjust satellite clocks, 4) maneuvers satellites if needed, 4) encrypts signals and 5) maintain GPS reference system (WGS84). ...
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