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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-ofService)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0.23～0.35 s;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.
In order to efficiently and flexibly utilize the limited spatial channel resources and improve the dynamics of the space station operation mode, it is very important to adopt a QoS-guaranteed space station to support multi-tasking dynamic time slot allocation.According to the multitasking characteristics of the space station, IP space station communication network architecture.According to the different QoS levels of the probe task, the multi-tasking dynamic time slot assignment method is mainly studied and a reservation-based on-demand slot assignment method with QoS guarantee is proposed.Finally, based on NS2 and STK Simulation results show that the delay of data transmission from space station to satellite via the relay satellite is 0.23-0.35 s. The end-to-end transmission delay from space station to the ground is affected by the active payload or the number of spacecraft. The activation is effective The smaller the number of loads or spacecraft, the smaller the end-to-end delay.