What are the reasons for the error of the GPS vehicle positioning system?

　　GPS positioning is a complex system. When used, it will be affected by various factors. It is mainly divided into four types:

　　1. SA

　　The US government takes national interests as the starting point. By restricting the accuracy of GPS positioning, GPS reference signals and high -frequency jitter, it artificially reduces the accuracy of ordinary users to GPS navigation and positioning.

　　Second, satellite star error

　　In the GPS positioning, the GPS navigation parameters of the satellite position at a certain time need to pass through various types of star tables, but no matter what kind of star calendar method is used, the calculated satellite position will be different from its actual location. Called the star error.

　　Third, satellite bell

　　The satellite bell difference includes the bell, frequency offset, and frequency drift to the random error of the clock. In the GPS measurement, whether it is a code -phase observation or a carrier phase observation, the satellite clock is required to be strictly synchronized with the receiving clock. Although all GPS satellites have high -precision atomic clocks (铷 bells and 铯), they still exist from the ideal GPS.

　　Fourth, the position of the center of the antenna phase

　　The position deviation of the center of the antenna phase refers to the difference between the nominal phase center and the actual phase center of the GPS signal transmitting antenna.

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