23:46
HardNetSoft Blog
The GPS system is managed by the U.S. Department of Defense and connects between 24 and 32 satellites that form as a "constellation" in medium Earth orbit. This corresponds to a distance of at least 20 000 km above the earth's surface, a lower altitude than the satellites (television, telephone, internet) and meteorological satellites in geostationary orbit, approximately 35 000 km.
The more GPS satellites global positioning system, the higher the accuracy of the data received is great.If a satellite fails or sends wrong signals, these signals are canceled through the records of another satellite in the constellation.
The GPS devices have been designed in the 1960s at the height of the Cold War. They were then intended for military applications and intelligence. But in 1983, after the USSR had shot down a civilian airliner Korean who had taken the wrong road and had entered Russian territory, Ronald Reagan, then U.S. president, said the development of a civilian version of GPS, available at all. Currently, access to GPS is free. It requires no subscription or fees. However, it must have a GPS receiver to use the system.
This system is currently used in dozens of applications, including aviation and shipping, road transport, cartographic drafting, research on earthquakes, climate studies and outdoor activity known as name geocaching.
A GPS receiver type is equipped with an antenna that detects the frequencies transmitted by the satellites. This antenna picks up signals and transmits them to the reception processor is then responsible for displaying the position and time very accurately.
