1. School of Geodesy and Geomatics Wuhan University Wuhan China
2. Hubei LuoJia Laboratory Wuhan China
3. GNSS Research Center Wuhan University Wuhan China
4. State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy & Geophysics Chinese Academy of Sciences Wuhan China
5. Division of Geodetic Science School of Earth Sciences Ohio State University Columbus OH USA