中低轨卫星跨层激光链路二次同步切换方法

发布时间：2018-08-10 22:39

【摘要】：中低轨卫星之间跨层激光链路的无缝切换直接决定了双层卫星光网络的稳定性.异步切换方法会导致网络拓扑频繁重构,而集中同步切换将造成两层间连接中断,网络运行状态失控.为此,本文提出了中低轨卫星星座激光链路的二次同步切换方法,在保证中低轨道卫星连通的基础上,可降低网络拓扑重构频率.研究了整数周期比的中轨道和低轨道卫星空间位置特性,建立了中低轨卫星星座构形二阶非球摄动模型,确定了中低轨道之间轨道周期比为3的双层卫星星座构形.按连接和切换顺序将该星座构形中跨层激光链路分为两组,以相对周期的1/4为基准,每次令其中一组同步切换,通过交替完成切换.研究结果表明,二次同步切换方法使得网络拓扑重构频率降低到链路切换频率的1/7,比集中切换方法在网络平均时延方面降低了30ms.
[Abstract]:The stability of the double-layer satellite optical network is directly determined by the seamless switching of the cross-layer laser link between the middle and low orbit satellites. Asynchronous handoff method will lead to frequent reconfiguration of network topology, while centralized synchronous handoff will result in the interruption of the connection between the two layers and the runaway state of the network. In this paper, a secondary synchronous switching method for the laser link of the Leo satellite constellation is proposed, which can reduce the frequency of network topology reconstruction on the basis of ensuring the connection of the low and middle orbit satellites. In this paper, the spatial position characteristics of medium-orbit and low-orbit satellites with integer period ratio are studied. The second-order non-spherical perturbation model of the constellation configuration is established, and the configuration of the two-layer satellite constellation with the orbit period ratio of 3 between the middle and low orbits is determined. The cross-layer laser links in the constellation configuration are divided into two groups according to the order of connection and handover. One group of laser links is switched synchronously each time according to 1 / 4 of the relative period, and the switch is completed alternately. The results show that the secondary synchronous handoff method reduces the network topology reconstruction frequency to 1 / 7 of the link handoff frequency, and reduces the average network delay by 30 mscompared with the centralized handoff method.
【作者单位】：空军工程大学信息与导航学院;空军西安飞行学院;
【基金】：国家自然科学基金(No.6231012) 陕西省自然科学基础研究计划(No.2015JM6360)
【分类号】：TN929.1

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