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　　The GPS receiver decodes the received satellite signal or uses other techniques to remove the information modulated on the carrier, and then the carrier can be restored. Strictly speaking, the carrier phase should be referred to as the carrier beat phase, which is the difference between the carrier phase of the received satellite signal affected by Doppler frequency shift and the signal phase generated by the receiver's local oscillation. Generally, by measuring at the epoch time determined by the receiver clock and keeping track of the satellite signal, the phase change value can be recorded. However, the initial phase value of the receiver and satellite oscillator at the beginning of observation is unknown, and the phase integer of the starting epoch is also unknown, that is, the integer ambiguity, which can only be used as a parameter solution in data processing. The accuracy of phase observation values can be as high as millimeters, but the premise is to solve the integer ambiguity. Therefore, phase observation values can only be used when there is a continuous observation value in relative positioning, and to achieve positioning accuracy better than the meter level, phase observation values can only be used.

　　The global satellite positioning system (GPS) has been increasingly widely used in many fields, but what is closest to our daily lives is the GPS system on mobile phones. Through this system, we can check the weather, traffic, and other conditions of our city. However, I suggest that netizens try to use GPS in a WiFi environment as much as possible to avoid consuming a large amount of mobile network traffic.

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