Modeling and effects analysis of GNSS precise point positioning ambiguity resolution based on the decoupled clock method

doi:10.11947/j.AGCS.2022.20210554

Abstract

Abstract: Precise point positioning with ambiguity resolution can significantly improve the positioning accuracy.However,as an important ambiguity resolution model,there are few literatures focused on the study of the decoupled clock model.Firstly,this paper introduces the product estimation strategy for ambiguity resolution based on the decoupled clock model,analyzes the differences of clock offsets between the conventional ionosphere-free model and the decoupled clock model,derives the satellite clock estimation model with satellite code bias extraction,and deeply investigates the advantages of the decoupled clock model in the convergence speed of satellite clock estimation.Different from other models,the wide-lane ambiguity bias of the decoupled clock model is time-varying in one day and estimated epoch by epoch.Based on this,the intra-day time-varying characteristics of wide-lane ambiguity bias are studied.Finally,the accuracy of the decoupled clocks is evaluated,and the precise point positioning ambiguity resolution experiment is carried out by using the decoupled clock products.The results show that,compared with the satellite clock estimation model with satellite code bias extraction,the decoupled clock model has faster convergence speed,and the clock product is more stable.The wide-lane ambiguity bias is relatively stable in one day,and the decoupled clock product has high accuracy.Compared with the conventional ionosphere-free model,the precise point positioning ambiguity resolution based on the decoupled clock product can significantly improve the positioning accuracy.

Key words: precise point positioning, decoupled clock model, wide-lane ambiguity bias, ambiguity resolution

CLC Number:

P228

YUAN Yunbin, LIU Shuai, TAN Bingfeng. Modeling and effects analysis of GNSS precise point positioning ambiguity resolution based on the decoupled clock method[J]. Acta Geodaetica et Cartographica Sinica, 2022, 51(8): 1669-1679.

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