Abstract：Beidou-3 experimental satellites are equipped with Ka band inter-satellite link(ISL) equipment, which provides satellite-ground orbit determination and time synchronization observation means of ISL mode. The mathematical model of synchronous observation of time-division satellite-ground two-way ISL mode is derived. Taking the satellite-ground data of ISL as a sample, the feasibility of time synchronization in ISL system is analyzed and compared with L band observations. The results show that the fitting parameters of clock offset in ISL system are consistent with those of L band. The fitting accuracies within 7 days, 3 days, 1 day and 1 hour are respectively 1 ns, 0.85 ns, 0.2 ns and 0.2 ns, which, especially for 1 day fitting, are better than those of L band. At the same time, the clock offset prediction accuracy of the next day is analyzed by using seven-day measurements of the satellite ground clock offset. The prediction error of ISL satellite clock offset is within 2 ns. Finally, the satellite-ground and inter-satellites combined observation is carried out. The error in 2 days observation is 0.52 ns. The feasibility of ISL observation is verified.
WEN Xufeng,HAO Jinming,HU Xiaogong et al. Feasibility Analysis of Time Synchronization of Beidou Satellite Using Inter-Satellite Observation Data[J]. jgg, 2018, 38(12): 1274-1279.
