1. College of Surveying & Geo-Informatics, Tongji University, Shanghai, China
2. School of Electronics and Information Engineering, Harbin Industry University, Harbin, China
3. Graduate School of Engineering Science, Osaka University, Osaka, Japan
4. Department of GNSS, Institute of Space Technology, Islamabad, Pakistan
5. Center for Northeast Asian Studies, Tohoku University, Sendai, Japan
6. Department of Surveying and Geo-informatics, Tongji University, Shanghai, China