A GPS Satellite Clock Offset Prediction Method Based on Fitting Clock Offset Rates Data

doi:10.11947/j.AGCS.2016.20150480

Abstract

Abstract: It is proposed that a satellite atomic clock offset prediction method based on fitting and modeling clock offset rates data. This method builds quadratic model or linear model combined with periodic terms to fit the time series of clock offset rates, and computes the model coefficients of trend with the best estimation. The clock offset precisely estimated at the initial prediction epoch is directly adopted to calculate the model coefficient of constant. The clock offsets in the rapid ephemeris (IGR) provided by IGS are used as modeling data sets to perform certain experiments for different types of GPS satellite clocks. The results show that the clock prediction accuracies of the proposed method for 3, 6, 12 and 24 h achieve 0.43, 0.58, 0.90 and 1.47 ns respectively, which outperform the traditional prediction method based on fitting original clock offsets by 69.3%, 61.8%, 50.5% and 37.2%. Compared with the IGU real-time clock products provided by IGS, the prediction accuracies of the new method have improved about 15.7%, 23.7%, 27.4% and 34.4% respectively.

Key words: clock offset rates, clock offset modeling, clock offset prediction, additional periodic terms, quadratic polynomial

CLC Number:

P228

WANG Fuhong, XIA Boyang, GONG Xuewen. A GPS Satellite Clock Offset Prediction Method Based on Fitting Clock Offset Rates Data[J]. Acta Geodaetica et Cartographica Sinica, 2016, 45(12): 1387-1395.

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