Xiaohang Shi, Yulong Fan, Lin Sun, Xirong Liu, College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, China, China; Xueting Mi, Chunxiu Liu, Xiurui Li, Qingdao Star-rising Technologies Co.,Ltd, China; Zexiu Chang, Satellite Application Center,Shandong Provincial Institute of Land Surveying and Mapping, China