Zhang Qingjun is an expert engaged in the field of space remote sensing and now works at the Institute of Remote Sensing Satellite (IRSS), CAST, China. He was the Chief Engineer and project manager of CBERS, Haiyang-2, Gaofen-3 satellites, etc., and has won several national science and technology awards. Liu Jie is a researcher at Beijing Institute of Spacecraft System Engineering (ISSE), a researcher at China Academy of Space Technology and was the Director System Designer of Haiyang-2 Satellite and Gaofen-3 satellite. He has been engaged in the fields of spacecraft system design and satellite remote sensing technology research since 2004.