摘要

TDMA(时分多址)体制的导航星间网络既可以实现导航测距,也具备较高的数据传输速率,具有较为广泛的业务适应能力;然而,TDMA体制的星间网络系统也存在着星上处理复杂与卫星节点处理能力低的矛盾;借鉴SDN(软件定义网络)将网络系统控制层面与数据层面相分离的思想,在TDMA体制的星间网络中引入SDN技术,设计了基于SDN的TDMA体制星间网络架构,将控制功能从卫星节点抽离出来,使其可以专注于星间数据转发,控制管理信息主要由卫星地面站(后续为高轨道卫星)扮演的SDN控制节点制定并分发,从而简化了卫星的业务负担,同时可以借鉴成熟的地面网络技术制定高效的控管策略;对所设计架构的主要的控管流程进行了仿真模拟,仿真结果表明,该架构具有一定的可行性。

Navigation Inter-satellite networks based on TDMA(time division multiple access)have extensive service range,they can both achieve navigation distance measurement and provide high transmission speeds.However,there are contradictions of complex tasks in satellites and satellites have low processing capacity in Inter-satellite networks based on TDMA.The theme of SDN(software defined network)is separate network layer and data layer of network systems.This paper designed an architecture of Inter-satellite network based on TDMA based on SDN by introducing the technologies of SDN to Inter-satellite network.By separating control function from satellites,this architecture makes satellites concentrate on transmitting data to each other.Satellite ground stations(maybe high orbit satellites in future)which are the SDN controller will make control instructions and distribute them to satellites.This architecture can simplify the burden of satellites and make control instructures efficiently by using the technologies of ground network.Meanwhile,this paper made a simulation of main controlling processes of the architecture,and the result of simulation showed that this architecture had certain feasibility.