Students Toward A New Democracy

GPS (Global Positioning System) is a navigation facilities that are really famous nowadays among various groups of society. The purpose of the system is the defining of the velocity and position of the objects. It may define the object at any place on Earth, even in polar territories and in space to one hundred kilometers above Earth in any weather conditions. The United States Department of Defense has developed and accomplished Global Positioning System.

The principle of the location definition is in measuring the distance from the point with the fixed coordinates to an object. The sending satellite spreads radio signal to a GPS antenna and the delay time is calculated to detect the distance between the receiver and transmitter. It signifies that to define 3-dimensional coordinates GPS receiver must identify the distance to 3 transmitters and the time of the GPS system. As a result, the signals from 4 satellites minimum are used for the definition of a receiver's coordinates and altitude. Schriever base, Colorado is the control station that implements the orbital force tracking from Earth.

GPS receivers are often used nowadays by civil people, sailors, rescuers and the police for location and speed definition of different objects. GPS systems are being traded in different shops and they are built in mobile phones, PCs and onboarders. A user may define his geographical location with the assistance of GPS receiver at any period of time that he needs. The greatest precision is from 3 to 5 meters and with the correction signal from Earth it is to 1 millimeter.

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