标题：The Tropospheric Product Combination of iGMAS Analysis Centers and the Analysis of Their Precision
作者：Yang, Yuguo; Xu, Tianhe; Sun, Zhangzhen
作者机构：[Yang, Yuguo] Changan Univ, Sch Geol Engn & Geomat, Xian 710054, Peoples R China.; [Xu, Tianhe] State Key Lab Geoinformat Engn, Xian 710054, Peoples 更多
会议名称：7th China Satellite Navigation Conference (CSNC)
会议日期：MAY 18-20, 2016
来源：CHINA SATELLITE NAVIGATION CONFERENCE (CSNC) 2016 PROCEEDINGS, VOL III
关键词：iGMAS; Tropospheric product combination; Robust estimation; Weighted; average; iGMAS station
摘要：Several analysis centers (AC) and a product integration and service center (ISC) have been built by the international GNSS continuous Monitoring and Assessment System (iGMAS) currently. ISC analyzes the quality of product provided by ACs of iGMAS, and then reprocesses to generate a combined product. The tropospheric solution is the key product of ISC and important data for satellite navigation and precise point positioning (PPP). First of all, this paper introduces the method and theory of tropospheric product combination by means of weighted average based on robust estimation. Then, the precision of combined tropospheric product of ISC and the AC's product with respect to the JPL final tropospheric delay is compared and analyzed. Furthermore, the tests of using iGMAS data are implemented to verify the accuracy and reliability of combined tropospheric solution. The results show that the RMS of the combined tropospheric solutions of IGS stations are better than those of most analysis centers, and meet the accuracy requirement of iGMAS. Finally, the precision of ACs' tropospheric products of iGMAS stations with respect to the ISC final products is compared and analyzed.