1. DFH Satellite Co., Ltd., Beijing 100094, China
2. School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
3. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China
4. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100101, China
5. Nanjing University, Nanjing 210023, China
6. Beijing Institute of Spacecraft Environment Engineering, Beijing 100094, China