Assessment of iGMAS final combination with nearly three-year solutions
作者单位：Beijing Institute of Tracking and Telecommunication Technology Shanghai Astronomical Observatory of Chinese Academy of Sciences School of Geodesy and GeomaticsWuhan University
会议名称：《第九届中国卫星导航学术年会》
会议日期：2018年
学科分类：08[工学] 080401[工学-精密仪器及机械] 081105[工学-导航、制导与控制] 0804[工学-仪器科学与技术] 0825[工学-航空宇航科学与技术] 0811[工学-控制科学与工程]
关 键 词：iGMAS orbit clock bias combination precision
摘 要：The international GNSS continuous Monitoring and Assessment System(i GMAS) is developed as a service platform for multi‐GNSS and the Product Integration and Service Center(ISC) is the products reprocess center which provides global users with different time‐delay *** nearly three‐year products from i GMAS,the present paper focuses on the timeliness and precision of *** results show that there are four analysis centers with products timeliness more than 95% and keep stable,currently,the timeliness of combined solutions are better than 99%.Compared to the IGS products,the precision of final orbit and clock products differs between different satellite system,the GPS shows best among the four systems,the precision of orbit and clock are 1 cm and 0.05 ns,respectively,followed by GLONASS,2 cm and 0.1 ns for satellite orbit and clock,respectively,while the BDS IGSO/MEO and Galileo satellites show identical results,the orbit precision of both systems is about 4 cm,and about 0.2 ns for the satellite clock *** precision of combined final tropospheric delay products is 2 mm,with respect to the products from JPL,while the difference between the combinations of i GMAS and IGS is about 2 TECU.