Clock synchronization experiment via Symphonie satellite

Clock synchronization experiments between ground stations in Shanghai and Beijing, and also Nanjing and Shanghai, were carried out. On the basis of these experiments, with two Cs atomic clocks located in Raisting (Federal Republic of Germany) and in Nanjing (China), synchronization experiments were conducted jointly via the Symphonie satellite. The experiments were performed with two-way relay noncoherent time transfer. Simultaneously, time comparison was made with transportable clocks. The experiments between Nanjing and Raisting show that the measured random fluctuation is about 10 nsec and that the accuracy of clock synchronization is better than 80 nsec. Experiments with transportable clocks, which were done simultaneously, confirm these results.