The operation principle is based on a method of spherical positioning, that the time employed consists in measuring from marks them radio to cover the distance satellite-receiver. Knowing the time employed from it marks them in order to reach the receiver and the exact position at least 3 satellites for having a position 2D (bidimensional), and 4 for having a position 3D (three-dimensional), is possible to determine the position in the space of the same receiver. Such procedure, called trilaterazione, uses alone distance information and is similar to the triangolation, from which however the angles differ for the fact to make less than regarding information.
The precision can ulteriorly be increased thanks to the use of systems like WAAS (American) orthe EGNOS (European), perfectly compatible between of they. They consist one or two in geostazionari satellites that they send of marks them of correction. The modality Differential-GPS (DGPS) uses a connection radio in order to receive given to DGPS from one earth station and to obtain an error on the position of a pair of meters. Modality DGPS-IP takes advantage of, rather than radio waves, the Internet net for the shipment of correction information.
Receivers GPS ("external"), interfacciabili by means of door USB or logons without threads like the Bluetooth exist in commerce, that they concur to realize navigators GPS on several devices you: portable palmari, PC, computers, and, if it equips you of sufficient memory, also cellular telephones. For navigation they exist software I affixed to you, owners or open source that they use one cartography, anch' it publishes or owner.
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