A Time Transfer Algorithm of Precise Point Positioning with Additional Atomic Clock Physical Model

doi:10.11947/j.AGCS.2016.20160217

Abstract

Abstract: In the traditional time transfer algorithms of precise point positioning, the receiver clock offset is estimated epoch by epoch as independent white noise and the short-term correlation between the epoch of the atomic clock offset is ignored. In order to solve this problem, a time transfer algorithm of precise point positioning with additional atomic clock physical model is proposed. The receiver clock parameters are expanded in the traditional model of precise point positioning by using Kalman filter to model the clock errors of high stability atomic clock, and the method of determining the covariance matrices of process noise and the initial state vector of the Kalman filter is presented. Experimental results show that the proposed algorithm can effectively avoid the convergence process of the traditional precise point positioning algorithm, and the result of the algorithm is more consistent with the physical properties of the atomic clock, this algorithm can significantly improve the accuracy and stability of the time transfer results, the accuracy of time transfer results of single station can be increased on average by 58%, and the accuracy of time synchronization between stations can be improved on average by 51%.

Key words: atomic clock, physical model, precise point positioning, time transfer

CLC Number:

P228

YU Heli, HAO Jinming, LIU Weiping, TIAN Yingguo, DENG Ke. A Time Transfer Algorithm of Precise Point Positioning with Additional Atomic Clock Physical Model[J]. Acta Geodaetica et Cartographica Sinica, 2016, 45(11): 1285-1292.

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