作者机构:[1]School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan 430079, China
相关基金:Supported by the National Natural Science Foundation of China (No. 40604001),the National High Technology Research and Development Program of China (No. 2007AA12Z312).Acknowledgement The authors thank Prof. Tao Benzao and Prof. Wang Xingzhou for several helpful suggestions during the preparation of this manuscript.