Clock synchronization experiment via SYMPHONIE satellite

Clock synchronization experiment between ground stations in Beijing and Shanghai and also between Nanjing and Shanghai were carried out in March, 1979, by the National Institute of Metrology of China. Based on the results of this experiment, two Cs-atomic clocks, one located in Raisting (Federal Republic of Germany) and the other in Nanjing (China) were compared from June 18 to 27, 1979, via SYMPHONIE satellite using two-way relay noncoherent time-transfer technique. The experimental results showed that an accuracy of 80 ns was achieved for the clock synchronization with a random fluctuation of about 10 ns. These results were confirmed by the use of a portable clock.