1 The Space Optical Technology Research Department, Xi′an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi′an, Shaanxi 710119, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 The Photoelectric Measurement and Control Technology Research Department, Xi′an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi′an, Shaanxi 710119, China