admin | 4:02 pm | June 20, 2008 | Progress & Technology
NAVSTAR GPS is a really popular navigation system that is applied by a large number of people nowadays. This arrangement gives a possibility to identify the position and speed of the objects at any place on Earth, including polar territories, almost in all weather conditions, and in space to one hundred kilometers above Earth. The United States Department of Defense has worked out and accomplished Global Positioning System.
The main principle of functioning is identifying of the position by the method of measuring the distance to an object from the spot with fixed coordinates. The distance is defined by the counting the delay time of radio signal sending from the satellite-transmitter to a GPS antenna which is a receiver. 3-dimensional coordinates may be detected when GPS receiver will know the distance to 3 satellites and the time of the NAVSTAR GPS system. And to define a receiver's coordinates and altitude it has to use minimum 4 transmitters' signals. The control over the transmitters from Earth is implemented in the control station that is located in Schriever base, Colorado.
Nowadays GPS receivers are frequently used for civil purposes, mostly for position and velocity detection. If you need handheld GPS systems you may buy it almost anywhere today. It is also built in the most personal computers, mobile telephones and onboarders. With a GPS receiver a consumer may detect his geographical coordinates at the present period of time. The accuracy of the situation definition is from three to five meters and when the signal is improved from Earth it becomes higher and may be to one millimeter.
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