Accuracy analysis of high-precision GNSS solution results for different precise ephemeris

When performing highfrequency GNSS data calculations during earthquakes, different precise ephemeris will have different effects on the GNSS solution results. This paper analyzes the accuracy of the final precision ephemeris (IGF) and fast precision ephemeris (IGR) provided by the IGS data center in the high-frequency GNSS data calculation results of the earthquake, and theoretically discusses the different ephemeris to the high frequency of the earthquake. The influence of GNSS data accuracy is selected. The high-frequency GNSS data of the Baja earthquake in 2010 is analyzed by GAMIT／TARACK single epoch dynamic positioning method. The results show that the two ephemeris have little difference with the high-frequency GNSS data during the earthquake. The difference between the E and N directions is no more than 2.2 cm, the difference in the U direction is not more than 4 cm, and the root mean square deviation of the E, N, and U directions of the two ephemeris is less than 2. The results show that the difference between the precision of the precise ephemeris and the accuracy of the solution results in the high-frequency GNSS data is in the centimeter level. When the high-frequency GNSS data processing work is performed, different precision ephemeris can be used for the alternative solution.