Global Positioning System

GPS (Global Positioning System) is a satellite navigation system developed by the United States Department of Defense (U.S. DoD = United States Department of Defense). GPS allows us to know our geographical position (latitude, longitude, and altitude above sea level). So wherever we are on this earth, we can know our position exactly.

GPS consists of three segments: space segment, control / control, and users

* Space Segment: consists of 24 satellites that operate in 6 orbit at an altitude of 20,200 km and inclination of 55 degrees with a period of 12 hours (satellite will return to the same point in 12 hours). The satellite orbits around so at least there are 6 satellites that can be monitored at any point on earth. Satellites transmit position and time to users worldwide.

* Segment Control / Controller: there is the main control center located in Colorodo Springs, and 5 others and 3 monitoring station antennas spread across the planet. Satellite monitoring station to monitor all GOS and gather information. Monitoring station then sends the information to the main control center and then perform the calculation and checking of the satellite orbit. The information can then be corrected and made pemuktahiran and sent to the GPS satellites.

* User Segment: The GPS receiver takes the user side (hereinafter we call the GPS devices), which usually consists of the receiver, processor, and antenna, enabling us wherever we are on this earth (land, sea, and air) can receive signals from GPS satellites and then calculate the position, velocity and time.

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