The GPS system can provide precise positioning services for highly dynamic objects because it carries a high-precision atomic clock. In addition, since 2000, the United States has cancelled the implantation error of the GPS system, so that most places on the earth can obtain the positioning quality with the highest accuracy of about 3 meters from the GPS civil signal, which has become the most widely used satellite positioning technology.

　　Today, we will divide the GPS system into several parts to explain what the GPS system is. I believe that many friends who are particularly concerned about the GPS system will want to know how to make us carry out high-precision positioning in real time through broadcast signal receiving operation. In this paper, we will briefly understand.

　　Although the GPS system is a satellite positioning and navigation system, its components are not only satellites. The GPS global positioning system consists of three parts: first, the satellite constellation we are familiar with, second, the equally important ground control/monitoring network, and finally, our users' own receiving equipment. Some people may say, why should the GPS system be divided into three parts? Why do we need ground control when there are satellites in the sky that can be used for positioning? Let's briefly explain these three parts.

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