Phoenixis Media

GPS (Global Positioning System) is a navigation facilities that are very popular nowadays among different layers of society. This system is created for detecting the position and speed of the objects at any area on Earth. It may be done almost in all weather conditions and in all the areas on Earth including polar area and in space to 100 kilometers above Earth. The developer of GPS is the United States Department of Defense that has accomplished this system.

The situation is defined by the principle of measuring the distance from the spot with the fixed coordinates to an object. The distance is counted by the delay time of radio signal spreading from the sending satellite to the reception of it by a GPS antenna. It means that to detect 3-dimensional coordinates GPS receiver must identify the distance to three satellites and the time of the GPS system. And to detect GPS receiver's coordinates and altitude it has to apply minimum 4 satellites' signals. Orbital force supervision is implemented from the principal control station that is situated in Schriever base, Colorado.

A lot of usual persons as well as the police, sailors and rescuers apply GPS systems for various needs, mostly for navigation, location and speed detection. You can get GPS devices in various shops. Today it is often built in cell phones, personal computers and onboarders. With a GPS receiver a consumer may detect his geographical coordinates at the definite period of time. The exactness of the definition of the signal location is from 3 to 5 meters and it is really improved with the correction radio signal from Earth and the calculating error is 1 millimeter.

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