The Global Positioning System, usually called GPS,

Global Positioning System, commonly known as the Global Positioning System, only fully functional satellite navigation system. GPS satellite network, more than 24 radio stations and GPS receivers, allowing them to pinpoint the location (the exact time signal of length, width and height at any time), day or night, anywhere in the world.

Department of Defense has developed a formal system called NAVSTAR GPS (Long Range Navigation GPS signals), satellite, by the 50th Space Wing, Schriever Air Force Base Management. Despite the system maintenance cost per year to 400 million, including the replacement of aging satellites, GPS is free as a public good for civilian use.

Global Positioning System has become an important tool in the world, modern navigation on land, sea and air worldwide and card production as an important tool to assess needs. GPS provides extremely accurate reporting period, the media and some scientific research, including research in the earthquake.

As the end of 2005, the new generation GPS satellite constellation added the first series, provides several new features, including a second signal greater accuracy and reliability of GPS L2C civilian population. In the coming years, the new generation of satellites will increase coverage of L2C and add a third and fourth alarm system, citizens, and advanced features.

Increase the spatial system (WAAS) solution, available from August 2000 to increase the accuracy of the GPS signal to two meters (six feet) [a receiver] compatible. Global positioning system accuracy can be increased up to 1 cm (0.5 inches) for a short distance, such as differential GPS (DGPS) technology.

Global Positioning System) satellite navigation system S with the Ministry of Defence. It is designed so that at least four satellites at all times, and that is enough to provide estimates of latitude, longitude, altitude and GPS receiver on Earth, after a few meters anywhere. The first GPS satellite was launched in the 1978th

In six different orbits around the 12,500-mile altitude orbit around the Earth System 24 satellites in 12 hours. Do nothing but continue to distribute the satellite atomic clocks of their current time based on the current location. Real-time monitoring of the satellites and the network connection to synchronize data. System used in the L - 1.2 to 1.6GHz frequency band fourth

When installed in vehicles or by hand, the global positioning system satellite receivers to calculate the distance to compare the signal was sent, this time they have the time of delivery. By understanding the exact location of the satellite receiver using triangulation, as parents century navigational equipment to determine its position.