Observation Weight Function Design for Fusing BDS/GPS Data to Estimate the Real-time Clock with Regard to the Orbit Errors

doi:10.11947/j.AGCS.2016.F024

Acta Geodaetica et Cartographica Sinica ›› 2016, Vol. 45 ›› Issue (S2): 39-45.doi: 10.11947/j.AGCS.2016.F024

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Observation Weight Function Design for Fusing BDS/GPS Data to Estimate the Real-time Clock with Regard to the Orbit Errors

GU Shouzhou^1,2, SHI Chuang¹, DANG Yamin^2,3, MI jinzhong², XUE Shuqiang^2,4, ZHANG Longping^3,2

1. GNSS Research Center, Wuhan University, Wuhan 430079, China;
2. Chinese Academy of Surveying and Mapping, Beijing 100830, China;
3. College of Geomatics, Shandong University of Science and Technology, Qingdao 266590, China;
4. College of Geology Engineering and Geomantics, Chang'an University, Xi'an 710054, China

Received:2016-11-25 Revised:2016-12-20 Online:2017-05-20 Published:2017-05-20
Supported by:
Key Project of China National Programs for Research and Development (Nos.2016YFB0501801;2016YFB0502105;2016YFB0501405);iGMAS(No.GFZX0301040308-06);The National Natural Science Foundation of China (Nos. 41474011;41104018;41404034);Special Research Grant for Surveying and Mapping Non-profit Public Service(No.B1503);The National High-tech Research and Development Program of China (863 Program) (No.2015AA124001);The Fundamental Research Funds for CASM(No.7771604)

Abstract

Abstract:

The real-time clock product is one of the basis products for wide-area positioning service of high precision. Considering the difference between BDS orbit precision and GPS precision, we design a new observation weight function, in order to optimize the stochastic model of real time BDS/GPS clock estimation. The BDS/GPS observations of 78 MGEX global stations and 2 iGMAS stations were collected to generate the real time clock, and then the calculation results were compared with the final iGMAS precise clock product in two strategies (the old stochastic model and the new stochastic model).It shows that the method based the proposed stochastic model can improve the precision of satellite clock about 9% for GPS and 10%for BDS.

Key words: precision clock estimation, weight function design, undifferenced, BDS/GPS, GNSS data fusion

CLC Number:

P227

GU Shouzhou, SHI Chuang, DANG Yamin, MI jinzhong, XUE Shuqiang, ZHANG Longping. Observation Weight Function Design for Fusing BDS/GPS Data to Estimate the Real-time Clock with Regard to the Orbit Errors[J]. Acta Geodaetica et Cartographica Sinica, 2016, 45(S2): 39-45.

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Observation Weight Function Design for Fusing BDS/GPS Data to Estimate the Real-time Clock with Regard to the Orbit Errors

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