GPS, a high-precision radio-navigation and positioning system based on aerial satellites, was first developed by the United States in the 1970s, for 20 billion US dollars, and by March 1994, the coverage of the GPS system was as high as 98 percent, providing services to the world.
The United States Global Positioning System consists of 27 satellites orbiting the Earth,24 of them in orbit and three in reserve, which are evenly distributed in six orbits. Each satellite is about 10,000 kilometers from the ground and can transmit radio signals of a certain frequency continuously. As long as there is a portable signal receiver, in any position in the world, will receive a specific signal from the satellite. The receiver's position can be confirmed by the analysis of signals from four or more satellites.
Besides navigation, gps has a variety of uses. Scientists monitor earthquakes by it, car drivers find its way by it, the military's direction by it, even missile launches and carrier ships need gps. Without a gps missile, there is no power or lethality. Carrier ships are lost in the sea.
Since GPS is so powerful, if the United States suddenly shut down GPS, can we live a normal life? The answer is yes, because in addition to the United States, there are two other countries in the world that have the same powerful global positioning system as GPS, one of which is Russia and the other is our China.
Russia has its own positioning system, which was first developed in the Soviet Union. In 1993, Russia began to develop its own global satellite navigation system in its own territory, and in 2009 it expanded its services to a total of 30 satellites in GLONASS,24 of which were in orbit, six were in orbit, and the range of errors in positioning and navigation was only 23 m, leading the world in terms of accuracy.
China independently developed the Beidou satellite navigation system with the United States GPS, Russia Gronas, the European Union Galileo system known as the world's four major satellite navigation systems. The Beidou positioning system consists of 39 stationary and non-static satellites, with Beidou 1 accuracy within 10 meters, and Beidou 2 can be accurate to meters, accuracy beyond GPS, and is expected to achieve global coverage soon.
China's Beidou system plans to provide free positioning, speed measurement and timing services to global users, to achieve global coverage, not only China, the world will benefit. In time, even if the United States turned off the GPS, the world will not be affected!