Tracking Software Platform Supports More Than 10000 Devices is a very powerful software platform.The predecessor of the GPS system is a Meridian satellite positioning system (Transit) developed by the US military. It was developed in 1958 and officially put into use in 64. The system works with a star network composed of 5 to 6 satellites, and it bypasses the earth 13 times a day at most, and cannot provide altitude information, and the positioning accuracy is not satisfactory. However, the Meridian system enabled the R&D department to gain preliminary experience in satellite positioning and verified the feasibility of positioning by the satellite system, laying the groundwork for the development of the GPS system. Because satellite positioning has shown great advantages in navigation and the Meridian system has huge shortcomings in submarine and ship navigation. The U.S. Army, Air Force and Civil Service all feel that there is an urgent need for a new satellite navigation system.
To this end, the U.S. Naval Research Laboratory (NRL) proposed a plan called Tinmation to form a global positioning network with 12 to 18 satellites at a height of 10,000 km, and launched an experimental satellite in 67, 69, and 74. The atomic clock timing system was initially tested on these satellites, which is the basis for the precise positioning of the GPS system. The U.S. Air Force has proposed a plan of 621-B with 4 to 5 satellites in each constellation to form 3 to 4 constellations. All of these satellites use a synchronous orbit and the rest use a tilted orbit with a period of 24 hours. The plan uses pseudo-random code (PRN) as the basis to spread satellite ranging signals. Its powerful function can detect it even when the signal density is less than 1% of the environmental noise. The successful use of pseudo-random codes is an important basis for the success of GPS systems. The Navy’s plan is mainly used to provide low-dynamic two-dimensional positioning for ships, and the Air Force’s plan can provide high-dynamic services, but the system is too complex. Since the development of two systems at the same time will cause huge costs and the two programs here are designed to provide global positioning, the US Department of Defense combined the two into one in 1973, and the satellite navigation and positioning joint led by the Department of Defense Under the leadership of the Planning Bureau (JPO), it also established an office in the Air Force and Space Department in Los Angeles. The organization has many members, including representatives from the U.S. Army, Navy, Marine Corps, Department of Transportation, Defense Mapping Agency, NATO, and Australia.
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