Differential Inter-System Biases Estimation and Initial Assessment of Instantaneous Tightly Combined RTK with BDS-3, GPS, and Galileo

Mingkui Wu 1, Wanke Liu 2,3,*, Wang Wang 2 and Xiaohong Zhang 2,3 1 School of Geography and Information Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China; wumk@cug.edu.cn 2 School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China; wangw158@whu.edu.cn (W.W.); xhzhang@sgg.whu.edu.cn (X.Z.) 3 Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China * Correspondence: wkliu@sgg.whu.edu.cn

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