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International time transfer experiment based on GPS-and BDS-precise point positioning(PPP)technique is carried out using final(ISC)and rapid(ISR)precise satellite clock products provided by iGMAS(international GNSS continuous Monitoring and Assessment System).As a comparison,the same processing is conducted by using COD products provided by the Center for Orbit Determination in Europe(CODE).Experimental data come from observation of seven stations from Multi-GNSS-Experiment(MGEX)and two stations including PT11(PTB)and BRUX(ROB)from time keeping laboratory in 70 days from 5 August to 15 October 2017.