Factors related to GPS satellites

　　Starting from its national interests, the U.S. government artificially reduces the accuracy of ordinary users using GPS for navigation and positioning by reducing the accuracy of broadcast ephemeris (technology) and adding high-frequency jitter to the GPS reference signal (technology).

　　satellite ephemeris error

　　When GPS positioning is performed, the satellite orbit parameters required to calculate the GPS satellite position at a certain time are provided by various types of ephemeris [7], but no matter which type of ephemeris is used, the calculated satellite position will be The difference from its true position is called ephemeris error.

　　Satellite clock difference

　　The satellite clock error is the error between the clock face time of the atomic clock installed on the GPS satellite and the GPS standard time.

　　Satellite signal transmitting antenna phase center deviation

　　The satellite signal transmitting antenna phase center deviation is the difference between the nominal phase center of the signal transmitting antenna on the GPS satellite and its true phase center.

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