What is the development of GPS?
The use of GPS positioning satellites, in a global real-time positioning, navigation system, known as the global satellite positioning system, referred to as GPS. GPS is an all-around, all-weather, full-time, high-precision satellite navigation system developed and developed by the US Department of Defense. It provides global users with low-cost, high-precision navigation information such as three-dimensional position, velocity, and precise timing. The application of satellite communication technology in the field of navigation has greatly improved the level of informatization in the earth society and effectively promoted the development of the digital economy. GPS can provide vehicle positioning, anti-theft, anti-robbery, driving route monitoring and call command. To achieve all of the above functions must have three elements: GPS terminal, transmission network and monitoring platform.
The original GPS program was born under the leadership of the United States Joint Planning Agency, which placed 24 satellites on three orbits that were 120 degrees apart. There are 8 satellites in each orbit, and 6 to 9 satellites can be observed at any point on the earth. In this way, the accuracy of the coarse code can reach 100m, and the precision of the fine code can be 10m. Due to the budget compression, the GPS plan had to reduce the number of satellite launches, instead of distributing 18 satellites on six tracks that were 60 degrees to each other. However, this solution did not guarantee satellite reliability. In 1988, the last modification was made: 21 work stars and 3 spare stars work on 6 tracks that are 60 degrees apart. This is how GPS satellites work.
The GPS navigation system is a radio navigation and positioning system that provides information such as three-dimensional position, three-dimensional velocity, and the like to all over the world based on 24 positioning satellites around the world. It consists of three parts, one is the ground control part, consisting of a master control station, a ground antenna, a monitoring station, and a communication aid system. The second is the space part, which consists of 24 satellites and is distributed over 6 orbital planes. The third is the user device part, which consists of a GPS receiver and a satellite antenna. Civilian positioning accuracy can be up to 10 meters.