Space Geodesy Research Group, Korea Astronomy and Space Science Institute, 61-1, Whaam-dong, Yusong-gu, Daejeon, 305-348 Korea, Republic of ; Shanghai Astronomical Observatory, Chinese Academy of Sciences, No 80, Nandan Road, Shanghai, 200030 China
Geodesy department, National Geomatics Center of China, 1 Baishengcun, Zizhuyuan, Beijing, 100044 China ;
Space Geodesy Research Group, Korea Astronomy and Space Science Institute, 61-1, Whaam-dong, Yusong-gu, Daejeon, 305-348 Korea, Republic of ;