1. School of Geography, Geomatics and Planning, Jiangsu Normal University, Xuzhou, China
2. National Geodetic Observatory, Wuhan, Innovation Academy for Precision Measurement Science and Technology, and the State Key Laboratory of Geodesy and Earth’s Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, China
3. School of Aerospace Science and Technology, Xidian University, Xi’an, China