GPS/Galileo实时天顶对流层延迟估计研究

采用14个MGEX测站观测数据，利用实时PPP估计方法计算得到Galileo、GPS和GPS/Galileo组合ZTD估值。14个测站的Galileo和GPS ZTD估值的相关系数绝大多数大于0.9，且Galileo-GPS ZTD差值的RMS为8～16 mm，RMS的平均值为12.3 mm，证明Galileo和GPS解的符合性良好，Galileo实时估计的ZTD精度满足要求。同时，IGS最终ZTD产品被用来评价各解算结果的精度，结果显示，GPS/Galileo联合解算时，相对于GPS单系统精度提高了5%~35%，相对于Galileo 单系统精度提高了25%~51%。

Research on GPS/Galileo Real-Time Zenith Troposphere Delay Estimation

This paper calculates ZTD for Galileo, GPS and GPS/Galileo, with PPP ZTD estimation method using observation data from 14 MGEX stations. The RMSs of Galileo-GPS ZTD differences range from 8 mm to 16 mm. The average of RMSs of total stations is 12.3 mm, which proves that Galileo-ZTD agrees well with GPS-ZTD and that the accuracy of Galileo real-time ZTD is satisfactory. Meanwhile, IGS final ZTD products are adopted to assess the performance of each solution. The result shows that the accuracy is improved by 5%－35% when compared to GPS single solutions, and 25%－51% to Galileo single solutions.