Research on multiplexing of Data Transmission Resource based on CAS's Space Science Strategic Priority Programs

摘要

Space Science Mission Operation Center (SMOC) plays the role as the leader of Space Science Mission Operation in China. At present, SMOC undertakes various missions as follows, Dark Matter Particle Explorer (DAMPE) and Quantum Experiments at Space Scale (QUESS) are in the phase of in-orbit operation, while the Hard X-ray Modulation Telescope (HXMT), launched on June 2017, is in commissioning phase. All of them are parts of the CAS's Space Science Strategic Priority Programs. The payload of DAMPE is composed of four sub-detectors. HXMT is Chinese first astronomical satellite. It will perform a broad band (1-250 keV) all-sky survey, in which a large number of massive black holes and other high energy objects will be detected. The payloads onboard HXMT include the High Energy X-ray Telescope, the Medium Energy X-ray Telescope, the Low Energy X-ray Telescope, as well as a Space Environment Monitor. The task of data transmission's planning and scheduling is solved via multiplexing of time period. This kind of strategy is easy and robust which can guarantee the accuracy of data transmission task's planning and execution while the staff of mission operation can easily master related skills. The frequency of the next seven-day data transmission station resource allocation is once a week for DAMPE, while the plan for the next day is determined daily for QUESS. To solve this problem, we noticed that the time of satellite's passing territory is due to periodicity of satellite orbits. According to this, we could construct ground station multiplexing model and the scheduling model. Next, the permutation and combination of the station receiving time window would be calculated using the dynamic programming strategy. And the confliction of the ground station resources in receiving multi-satellites and multi-missions is overall considered and conclude the selective multiplexing schema list of data transmission resource. Then, considering the satellite's data storage capacity and data transmission capacity, the model and the best evaluation technique is used to evaluate the multi-transmission solution on the arrangement of the ground station resources.