1. Ph.D. Student, College of Aerospace Science and Engineering, National Univ. of Defense Technology, Changsha 410072, China.
2. Professor, College of Aerospace Science and Engineering, National Univ. of Defense Technology, Changsha 410072, China (corresponding author).
3. Associate Professor, Unmanned Systems Research Center, National Innovation Institute of Defense Technology, Beijing 100071, China.
4. Associate Professor, College of Aerospace Science and Engineering, National Univ. of Defense Technology, Changsha 410072, China.