卫星动平台下动态门控调度的设计与实现

当运动节点构成的大规模动态平台执行分布式协作任务时，如何保证关键数据通信的实时性和确定性,这是一项新的挑战。文章以时间敏感网络（time sensitive networking，TSN）技术为背景，结合卫星构成的分布式动态通信平台上的链路特性，基于TSN中的门控调度技术，提出了一种适用于卫星链路场景下的动态调度算法。通过改进TAS（time aware shaper）调度算法，减少卫星动平台因通信距离动态变化以及空间摄动等因素造成的传输时延，从而增加动平台上卫星通信系统的确定性。同时根据动态卫星链路周期性运动特征，提出周期性门控调度机制，保证所有周期内相同时间点的门控调度一致。最后通过现场可编程门阵列（FPGA）设计的验证测试结果表明，提出的TAS改进方案可以适用于卫星网络的确定性调度，充分发挥时间敏感网络的优势。

Design and implementation of deterministic gating scheduling for satellite dynamic platform

Providing realtime and definitive transactions of critical data is a new challenge for a large scale dynamic platform composing of moving nodes to perform the distributive coordination tasks. In this paper, the gated scheduling technology in time sensitive networks (TSN) was studied and adapted, and a dynamic scheduling algorithm suitable for the satellite link was proposed, based on the TSN technology and combined with the characteristics of links on dynamic platforms formed by networked satellites.The time aware shaper (TAS) scheduling algorithm was improved to reduce the transmission delay caused by dynamic changes of communication distance and spatial perturbation, so as to increase the certainty of the satellite communication system on the moving platform.At the same time, according to the periodic variation characteristics of the dynamic satellite links, a periodic gated scheduling mechanism was proposed to ensure the consistent gated scheduling at the same time points in all cycles.Finally, through the field programmable gate array (FPGA) circuit design verification, the results showed that the improved TAS scheme proposed in this paper could be applied to the deterministic scheduling of satellite networks and give full play to the advantages of time-sensitive networks.