Example of GPS system subject to GPS blocker jamming
The predecessor of the GPS system is the Meridian satellite positioning system developed by the US military. It was developed in 1958 and officially put into use in 1964. The system works with a network of 5 to 6 satellites and circumnavigates the Earth up to 13 times a day, but it cannot give altitude information and is not satisfactory in terms of positioning accuracy. However, the Meridian system enabled the R&D department to gain initial experience in satellite positioning, and verified the feasibility of positioning by the satellite system, laying the foundation for the development of the GPS system.
Because the satellite positioning shows the great superiority in navigation and the meridian system has a huge GPS in the navigation of submarines and ships, the U.S. Navy, Air Force, and civilian departments all feel the urgent need for a new satellite navigation system,but subject to GPS jammers blocker jamming. To this end, the U.S. Naval Research Laboratory proposed a global positioning network program called Tinmation, consisting of 12 to 18 satellites and an altitude of 10,000 kilometers, and launched a test satellite in 1967, 1969 and 1974. The atomic clock timing system, which is the basis for precise positioning of the GPS system, was initially tested on these satellites.
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