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Tightly Combined BeiDou B2 and Galileo E5b Signals for Precise Relative Positioning

Published online by Cambridge University Press:  21 June 2017

Mingkui Wu ,
Xiaohong Zhang ,
Wanke Liu ,
Shaojie Ni  and
Shun Yu
Mingkui Wu
Affiliation:
(School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan, 430079, P.R. China)
Xiaohong Zhang
Affiliation:
(School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan, 430079, P.R. China) (Collaborative Innovation Centre for Geospatial Technology, 129 Luoyu Road, Wuhan, 430079, P.R. China) (Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan, 430079, P.R. China)
Wanke Liu*
Affiliation:
(School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan, 430079, P.R. China) (Collaborative Innovation Centre for Geospatial Technology, 129 Luoyu Road, Wuhan, 430079, P.R. China) (Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan, 430079, P.R. China)
Shaojie Ni
Affiliation:
(Satellite Navigation Engineering Research Center, National University of Defense Technology, 190 Deya Road, Changsha, 410073, P.R. China)
Shun Yu
Affiliation:
(School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan, 430079, P.R. China)
*
(E-mail: wkliu@sgg.whu.edu.cn)
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Abstract

In precise relative positioning applications, an effective approach to improve the interoperability of GNSS systems is the tightly combining or inter-system double-differencing of observations from the common frequencies that are shared by different constellations. As the BeiDou satellites are currently transmitting a B2 signal at 1207.14 MHz that is identical to the Galileo E5b signal, the inter-system double-differenced observations can also be created between observations from both systems at that particular frequency. In this paper, we will focus on the instantaneous ambiguity resolution performance analysis of tightly combining BeiDou B2 and Galileo E5b observations. The size and stability of phase and code Differential Inter-System Biases (DISBs) between BeiDou B2 and Galileo E5b signals are first investigated, in which the new BeiDou and Galileo satellites launched recently will also be included. Then, first results of the Tightly Combined Model (TCM) with a priori corrected DISBs (TCM_C) are evaluated in comparison to the Loosely Combined Model (LCM) and tightly combined model with unknown DISBs (TCM_F) in an instantaneous approach. It is demonstrated that the instantaneous integer ambiguity resolution performance can be improved using the TCM_C with respect to LCM and TCM_F.

Keywords

BeiDou (BDS)GalileoTightly combinedDifferential Inter-System Bias (DISB)Relative positioning
Type
Research Article
Information
The Journal of Navigation , Volume 70 , Issue 6 , November 2017 , pp. 1253 - 1266
Copyright
Copyright © The Royal Institute of Navigation 2017 

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