Kashima Space Research Center, National Institute of Information and Communications Technology, 893-1 Hirai, Kashima, Ibaraki, 314 Japan; Advanced Geodesy, Inst. of Geodesy and Geophysics, Vienna University of Technology, Gusshausstrasse 27-29, Vienna, 1040 Austria
Kashima Space Research Center, National Institute of Information and Communications Technology, 893-1 Hirai, Kashima, Ibaraki, 314 Japan
Advanced Geodesy, Inst. of Geodesy and Geophysics, Vienna University of Technology, Gusshausstrasse 27-29, Vienna, 1040 Austria