1. Associate Professor, School of Astronautics, Beihang Univ., Beijng 100191, P.R. China.
2. Ph.D. Student, School of Astronautics, Beihang Univ., Beijng 100191, P.R. China (corresponding author).
3. Ph.D. Student, School of Astronautics, Beihang Univ., Beijng 100191, P.R. China.
4. Engineer, Beijing Institute of Control Engineering, Beijng 100094, P.R. China.
5. Senior Engineer, Beijing Institute of Control Engineering, Beijng 100094, P.R. China.