1. National Time Service Center Chinese Academy of Sciences Xi' an Shaanxi People's Republic of China
2. University of Chinese Academy of Sciences Beijing People's Republic of China
3. Chengdu Spaceon Technology Co., Ltd. Chengdu Sichuan People's Republic of China
4. China Academy of Space Technology (Xi'an) Xi'an Shaanxi People's Republic of China
5. Hubei Key Laboratory of Gravitation and Quantum Physics PGMF and School of Physics Huazhong University of Science and Technology Wuhan Hubei People's Republic of China
6. PRISMA Cluster of Excellence Johannes Gutenberg Universität Mainz Federal Republic of Germany