1. School of Geodesy and Geomatics Wuhan University Wuhan China
2. MOE Key Laboratory of Geospace Environment and Geodesy Wuhan University Wuhan China
3. GNSS Research Center Wuhan University Wuhan China
4. Division of Geodetic Science School of Earth Sciences The Ohio State University Columbus OH USA
5. Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan China
6. Department of Geomatics National Cheng Kung University Tainan Taiwan