空间站支持多任务动态时隙分配研究

为高效、灵活利用有限的空间信道资源, 提高空间站运营模式的动态性, 采用具有QoS (Quality-of-Service)保证的空间站支持多任务动态时隙分配十分重要. 根据空间站多任务特点, 提出一种基于IP的空间站通信网络架构. 根据探测任务的不同QoS等级, 重点研究了多任务动态时隙分配方法, 提出了一种基于预留的具有QoS保证的按需时隙分配方法. 基于NS2和STK进行仿真, 并得出如下结论: 空间站经中继卫星到地面的数据传输时延在0.23～0.35s; 空间站到地面的端到端传输时延受激活的有效载荷或航天器数目影响, 激活的有效载荷或航天器数越少, 端到端的时延越小. 

Research on Dynamic Slots Allocation Supporting Multi-missions for Space Station

To utilize the limited channel resources of space with efficiency and flexibility, and to improve the dynamics of space station operation, it is important to dynamically allocate slot with Quality-of-Service (QoS) for supporting multi-missions of space station. According to characteristic of space station, a networking architecture for space station is presented. The slot allocation methods based on QoS are emphasized, and a demand slot allocation with QoS guarantee based on reservation is proposed. Using NS2 and STK, the results of simulation show that the propagation delay between space station and ground varies from 0.232s to 0.35s, and that the less active payload or spacecraft number is, the less End To End (ETE) delay is.