The composition of GPS[汽车维修知识]

GPS consists of three parts: space segment, control segment and user segment.
The space segment consists of 24 satellites distributed on 6 orbital planes. The orbit height of the satellite is 20200km, the inclination angle is 55 degrees, and the period is 12 hours. The orbital distribution of the satellites ensures that at least 6 satellites can be seen at any time around the world, and the satellites continuously provide users with position and time information.
The control section is composed of a main control station, 5 monitoring stations, and three injection stations. The main control station is located in Colorado. The monitoring station tracks all GPS satellites in the field of view, collects satellite ranging information, and sends the collected information to the main station. The master station calculates the precise orbit of the satellite and generates navigation information for each satellite, which is transmitted to the satellite through the injection station.
The user segment is composed of a receiver, a processor, and an antenna. Calculate the user's location speed and time by receiving satellite broadcast information.
The concept of GPS is based on satellite ranging, and users calculate their position by measuring their distance to the satellite. When the position of the satellite is known, each GPS satellite sends a position and time signal, and the user receiver measures the time delay for the signal to reach the receiver, which is equivalent to measuring the distance from the user to the satellite. By measuring four satellites at the same time, the position, speed and time can be solved.
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