Jianjun Zhu received an M.Eng. degree in engineering surveying and a Ph.D. in geodesy and surveying engineering from the Central South University of Technology (now Central South University), Changsha, China, in 1985 and 1998, respectively. From 1998 to 1999, he was a Research Assistant with the Department of Land Surveying and Geo-informatics, The Hong Kong Polytechnic University, Hong Kong. From July 2000 to July 2001, he was a Post-Doctoral Fellow with the Center for Research on Geomatics, Laval University, Quebec, Canada. He is currently a Full Professor with the School of Geosciences and Info-physics, Central South University. His research interests include the theory of errors and surveying adjustment and its applications on interferometric synthetic aperture radar (InSAR) and global positioning systems (GPSs).