Abstract:In the widearea real time precise point positioning, the ultra short term prediction of satellite clock error is needed for real time solving. The effects of the different satellite type clock error prediction were analized, including linear model, quadratic polynomial model, grey model and quadratic polynomial model based on epoch difference. The results of analysis show that prediction accuracy by the four methods satisfy the needs of precise point positioning in the ultra short term prediction of satellite clock error. In ultra short term prediction with small specimen, prediction accuracy of clock error is irrelevant to satellite. It mainly depends on the small scale change of clock error in different period and the length of prediction time.