IGS RTS产品数据中断修复方法研究

Research on Repairing Method for the Data Interruptions of IGS RTS Products

针对IGS RTS(real time service)实时数据流产品难以避免的数据中断现象,开展了RTS数据中断修复方法研究,提出"插值修复"方法。在对RTS数据中断的区间分布进行统计分析的基础上,选取15min为可修复的最大数据中断区间;采用常用的拉格朗日插值方法进行RTS轨道数据中断修复,对不同阶数的插值修复效果进行比较;提出新的基于RTS改正的精密卫星钟差计算方法,采用拉格朗日插值、三次样条插值、线性插值和线性拟合等方法进行RTS钟差数据中断修复和结果对比;最后利用IGS跟踪站观测数据和修复后的RTS产品,进行静态模拟动态的准实时PPP实验,对"插值修复"方法的效果和PPP定位精度进行验证。

This paper first analyzed the data interruptions of RTS （real time service） products, and second carries on research into methods of repairing of these disruptions. According to statistics on the interval distribution of these data interruptions, the maximal repairable interval of 15 min is selected. Then, the data interruptions less than 15 min are repaired with different interpolation methods. The satellite orbit data interruptions are repaired using the common Lagrange interpolation with different orders. In order to explore the optimal solution, the satellite clock data interruptions are repaired with the Lagrange interpolation, cubic spline interpolation, linear interpolation and linear fitting, respectively. Finally, an experiment of simulative near real-time PPP on the IGS station is conducted using the repaired RTS orbit and clock products to verify the proposed method.