Kezhao Li was born in Jing Yuan County, Gansu province, China, on October 9th, 1977. He received his Ph.D. in astronautics from Northwestern Polytechnical University in 2007. Dr. Liâ€™s main research areas include satellite navigation, survey and vision relative navigation. He is an associate professor of Henan Polytechnic University, China, and now is studying postdoctoral research in College of Geology Engineering and Geomatics, Changâ€™an University, China. He has been extensively published more than twenty papers in professional core periodical and international conferences.