1. Associate Professor, College of Astronautics, Nanjing Univ. of Aeronautics and Astronautics, Nanjing 210016, P.R. China (corresponding author).
2. Research Assistant, Nottingham Geospatial Institute, Univ. of Nottingham, Nottingham Geospatial Bldg., Nottingham NG7 2TU, U.K.
3. Professor, Aviation Key Laboratory of Science and Technology on Inertial, Flight Automatic Control Research Institute, Xi’an 710065, P.R. China.
4. Associate Research Fellow, Aviation Key Laboratory of Science and Technology on Inertial, Flight Automatic Control Research Institute, Xi’an 710065, P.R. China.