The School of Cyber Science and Technology Beihang University Beijing 100191 China;
National Time Service Center China Academy of Science Xi’an 710600 China;
Beijing Aerospace Guanghua Electronics Technologies Co. Ltd. Beijing 100091 China;
Shenzhen Research Institute of Big Data Shenzhen 518000 China;
University of Surrey GU27XH U.K.Peng Cheng Laboratory Shenzhen 518000 China;
emergency communication; micro UAV; UAV flight formation; conformal antenna;