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Precise Orbit and Clock Products for Multi-GNSS System from MGEX and iGMAS

JI Guofeng;YANG Zhiqiang;JIA Xiaolin;College of Geology Engineering and Geomatics,Chang'an University;State Key Laboratory of Geo-Information Engineering;Xi'an Research Institute of Surveying and Mapping;  
Precise orbit and clock products for GPS,GLONASS,Galileo and Beidou from IGS MGEX and iGMAS are evaluated in this paper.Comparison among individual analysis centers(ACs),SLR validations,clock polynomial fitting and Allan deviation are utilized to analyze the characteristics of precise orbit and clock products from each ACs.The results show that:the orbit accuracy of GPS and GLONASS is about 1.0~1.3cm and 2.0~3.6cm,respectively;the GPS and GLONASS orbit products from iGMAS are better than other ACs'.For the Galileo system,the orbit agreement is about 10~17cm in general;use of ECOM2 or a prior model can improve orbit quality.For the BDS system,the orbit agreement is about 21~40cm for IGSOs,11~18cm for MEOs,and the radial accuracy is better than 10 cm and 5cm respectively.However,GEO orbits have the worst agreements,having a few meters differences and radial errors of about 25 cm.Clock agreement is 0.2~0.4ns for Galileo,0.35~0.46 ns for BDS GEOs,0.25~0.33 ns for BDS IGSOs,and0.11~0.21 ns for BDS MEOs.The BDS IGSOs and MEOs' clock products from CODE are markedly influenced by the yaw-attitude mode.
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