GPS-Global Positioning System

Global Positioning System, commonly known as the Global Positioning System, only fully functional system for satellite navigation. GPS satellite network, more than 24 radio stations and GPS receivers so they can locate (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 formula known as NAVSTAR GPS (Long Range Navigation GPS signals), satellite, by the 50th Space Wing, Schriever Air Force Base Management. In spite of system maintenance per year to 400 million, including 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 around the globe and map production as an important tool to assess needs. GPS provides a very accurate reporting period, the media and some scientific research, including research on earthquake.
By the end of 2005, added the new generation GPS satellite constellation in the first row, contains several new features, including a signal improved accuracy and reliability of GPS L2C civilian population. In the coming years, the new generation of satellites to 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 it is enough to give an estimate of latitude, longitude, altitude and GPS receiver on Earth, after a few meters across. The first GPS satellite was launched in 1978: e
In six different orbits approximately 12,500 miles altitude orbit around the Earth System 24 satellites in 12 hours. Do nothing but continue to distribute satellite atomic clocks of their current time based on current location. Real-time monitoring of satellites and the network connection to synchronize data. System used in the L - 1.2 to 1.6 GHz frequency band fourth
When mounted in vehicles or by hand, and the global positioning system satellite receivers calculate the distance to compare the signal was sent, this time, the time of delivery. By understanding the exact location of the satellite receiver using triangulation, as parents century navigational equipment to determine its position.