不同精密星历对震时高频GNSS解算结果精度分析

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

进行震时高频全球卫星导航系统(GNSS)数据解算时,不同的精密星历对GNSS解算结果会有不同的影响.本文针对IGS数据中心提供的最终精密星历(IGF)和快速精密星历(IGR)在震时高频GNSS数据解算结果中的精度进行分析,从理论上探讨不同星历对震时高频GNSS数据精度的影响,选取2010年Baja地震的高频GNSS数据采用GAMIT/TARACK单历元动态定位方法进行解算分析,结果表明,两种星历对震时高频GNSS数据结果相差不大,在E、N方向上差值最大不超过2.2 cm,在U方向上差值最大不超过4 cm,且两种星历E、N、U方向均方根偏差小于2,解算震时高频GNSS数据时不同精密星历对解算结果精度影响差别在厘米级,当进行震时高频GNSS数据处理工作时,可使用不同精密星历进行替代解算.

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.