Jian Yan, Xiaofei Mi, Aerospace Information Research Institute, Chinese Academy of Sciences, China; Zhigao Ma, Henan Polytechnic University, China; Hongbo Zhu, North China Institute of Aerospace Engineering, China; Zhenzhao Jiang, Yuke Meng, Henan Polytechnic University, China; Peizhuo Liu, Beihang University, China; Jian Yang, Xingfa Gu, Aerospace Information Research Institute, Chinese Academy of Sciences, China