Based on different constraints,double-frequency measurement data from 11GPS stations in the vicinity of China and 230 global GPS stations were used to calculate vertical ionosphere electron content(VTEC),the DCB of GPS satellites,and corresponding receivers based on the spherical harmonic function model.The results show that the VTEC and the combination DCB of GPS satellite and receiver were not affected by constraints.The DCB precision of the combination obtained is less than 2ns comparing with CODE,and th...
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