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COMBINATION MODELS FOR NAVIGATION SATELLITE CLOCK PREDICTION

Affected by environmental and other factors,the navigation satellite atomic clocks must produce error and bias. The research shows that clock errors and bias result from five type noise and there are several models with then the error and bias can be predicted.Each model has its disadvantages and advantages.In order to improve the reliability of the prediction of clock error and bias,it is useful to combine the forecasting result with each single model.This paper discusses the method for combining polynomial and grey model by use of the IGS precision clock series atomic clocks as an example.Finally,a useful idea from the result is adopted that the model combination is used to prediction the navigation satellite clock error and bias.