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GPS satellite positioning

source:truck tracking webfleet solutions release time:2023-02-15 Hits:     Popular:realtime gps tracker online

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  Satellite positioning is to locate by receiving latitude coordinate signals provided by the satellite. The satellite positioning systems are mainly: the United States Global Positioning Department (GPS), Glonass (Glonass), European Galileo system, and China Beidou satellite navigation The system, wherein the GPS system is the most widely used satellite positioning technology at this stage.

  GPS global satellite positioning system consists of three parts: space parts, ground control parts, and user equipment parts.

  The space part is composed of 24 working satellites. They are evenly distributed on the 6 orbit planes (4 per track surface). The geometric image that can maintain good positioning and solve precision;

  The control part is mainly composed of monitoring stations, main control stations, backup main stations, and information injection stations. It is mainly responsible for the management and control of the GPS satellite formation;

  The user device part is mainly the GPS receiver. The main function is to receive the signal of the GPS satellite emission, obtain positioning information and observation capacity, and to achieve positioning by data processing.

  The positioning principle of GPS is to determine the location of the GPS receiver through the four known positions.

  To achieve this purpose, the position of the satellite can be found in the satellite star calendar according to the time recorded by the Star Hall. The distance from the user to the satellite is transmitted to the time of the user through the record satellite signal, and then multiply it at the speed of light (due to the interference of the ionization layer of the atmosphere, this distance is not the true distance between the user and the satellite, but it is, but it, but it is, but it is not the real distance between the user and the satellite, but it is, but it is not the real distance between the user and the satellite. Pseudorange).

  When the GPS satellite works normally, the pseudo -random code (referred to as a pseudo -code) composed of 1 and 0 binary code elements will be continuously launched. Navigation electricity includes information such as satellite stars, working conditions, clock correction, ionization delay correction, and atmospheric refraction correction and other information. However, because the clock used by the user's receiving aircraft is not always synchronized with the satellite star shot clock, in addition to the user’s three -dimensional coordinates X, Y, and Z, the time difference between a variable T is the time difference between the satellite and the receiver as the unknown. Then use 4 equations to solve these 4 unknown counts. So if you want to know the location of the receiver, at least you must receive signals of 4 satellites.


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