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Estimation and evaluation of the triple-frequency GPS satellite inter-frequency clock bias

A new estimation method is presented to detect and remove the potential outliers in the triple-frequency GPS inter-frequency clock bias (IFCB) estimating. The estimated results of the robust estimation (RE) can successfully mitigate the influence of outliers on IFCB estimation, IFCB modelling and IFCB application. The difference between the constant parts of IFCB estimated with observations and the differential code bias (DCB) (P1–P2) and DCB (P1–P5) products is computed and this difference shows that the DCB products cannot completely replace the constant parts of IFCB. The characteristic of the IFCB modeling is discussed based on the 5- year results. The estimated IFCB is evaluated and its impact on the precise point positioning (PPP) is analysed. The PPP results show that the influence of the IFCB on the static positioning is different with that of kinematic mode.