Abstract
Coordinated Universal Time (UTC) is regarded as reference time scale for the worldwide time coordination. In order to steer master clock in timekeeping laboratory, it is necessary to make a prediction of UTC-UTC(Lab) time offset for 15~45 days. The prediction is based on two considerations, data size and prediction model. Compared with quadratic polynomial model and grey model, calculating results show a combination model based on 9 months data size is fitter to secular predicting in terms of both stability and accuracy.
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