共查询到19条相似文献,搜索用时 171 毫秒
1.
设计高效弹性的卫星路由算法是未来低轨(Low Earth Orbit, LEO)卫星通信技术的一个重要发展方向。为解决低轨卫星星座网络中星间链路发生故障后存在的传输中断和数据安全问题,提出了一种低轨卫星星座快速响应链路损毁路由算法(Quick-response Link Destruction Routing Algorithm for LEO Satellite Constellation, QRLDRA)。QRLDRA以星座可预测拓扑作为星间路由计算基础,增加星地回传路由设计,快速将星间链路异常回传至地面计算中心处理;引入多优先级动态队列,根据节点链路状态调整星间链路不同数据传输的优先级;综合路由计算、路由上注、链路检测等功能,完成对拓扑变化的及时响应。通过仿真实验与传统算法的比较发现,所提算法有效提高了数据端到端传输的成功率,为用户业务服务质量(Quality of Service, QoS)提供了可靠保障。 相似文献
2.
给出了极轨道星座的设计方案。分析了星际链路的空间几何关系。结合极轨道星座的例子,通过卫星仿真软件STK进行卫星星座仿真,分析得到低轨卫星系统星际链路的仿真结果,并简要提出低轨道卫星组网的路由算法。 相似文献
3.
4.
5.
6.
7.
8.
空间因特网的核心是卫星通信网,而路由算法是卫星通信网的关键技术,是实现通信网中高效可靠信息传输的基础。在分析典型路由策略路由算法的基础上,提出了一种具有简单QoS性能保证的路由算法,该算法在不提高计算复杂度的前提下,得到更好的综合性能指标。仿真结果表明:新算法具有较高的现实可行性,并在两大性能方面均获得了较大的改进,满足了不同数据业务类型A或B对于路由算法QoS性能的不同要求。 相似文献
9.
10.
11.
12.
A new double-layer satellite network model for space networking was established and a routing algorithm based on topology control (TCRA) was proposed considering the advantages of low earth orbit and stationary earth orbit satellite networks.This model used virtual node strategy and satellite grouping idea,which regarded the coverage area of each low earth orbit satellite as a virtual node.The network took into account the influence of the polar area on the division of the satellite footprints,such that the upper management satellites can accurately acquire the topology of the lower satellites.Using the improved virtual node strategy,the time slices were superior to other network models in quantity,length and other aspects.Based on the network topology,stationary earth orbit satellites calculate routing for low earth orbit satellites,while low earth orbit satellites were responsible for forwarding data.The simulation results show that the routing algorithm is superior to other algorithms in average end-to-end delay and packet loss rate. 相似文献
13.
14.
Satellite networks provide global coverage and support a wide range of services, low Earth orbit (LEO) satellites provide short round-trip delays and are becoming increasingly important. One of the challenges in LEO satellite networks is the development of specialized and efficient routing algorithms. In this work, a datagram routing algorithm for LEO satellite networks is introduced. The algorithm generates minimum propagation delay paths. The performance of the algorithm is evaluated through simulations. The robustness issues of the algorithm are also discussed 相似文献
15.
在分析传统卫星网络路由算法的基础上,提出一种基于分时的LEO卫星网络无环路由算法(DTRA)。针对卫星在各时间片之间进行路由表切换时可能出现的路由环问题,算法采用平滑路由表切换策略消除由于切换前后网络状态信息不一致而产生环路的可能性,保证分组在任何时刻都能够沿无环最短时延路径被转发。同时,DTRA也能够通过使用无环备份路径处理可能出现的链路拥塞、节点失败等突发情况。通过复杂性分析可知,算法只需较小的星上存储开销和星上处理开销,而无需星问通信开销。仿真实验结果也表明算法能够提供数据最优传送,具有较好的端到端时延性能。 相似文献
16.
17.
WangKaidong TianBin YiKechu 《电子科学学刊(英文版)》2005,22(1):77-84
A novel distributed packet routing algorithm for Low Earth Orbit (LEO) satellite networks based on spiderweb topology is presented. The algorithm gives the shortest path with very low computational complexity and without on-board routing tables, which is suitable and practical for on-board processing. Simulation results show its practicability and feasibility. 相似文献
18.
1 IntroductionSatellitenetworksconsistofroutingswitchingdevicescarriedbysatellites,Inter SatelliteLinks/Inter Ground SatelliteLinks (ISL/IGL) ,gatewaysontheground ,stationaryandmobileusers.Theyhaveglobalvisibilityandveryflexiblebandwidth on demandcapabilities.Alsotheycan provideaccessservicesforallkindsofstationaryormobiledevicesinvolvedintheground ,seaandskyandcarryvoice,data,videoandbroadbandmultimediaapplicationservices.Becauseofminutepropagationdelays (ap proximately 5ms) ,theLowEar… 相似文献
19.
The rapid advancement of communication and satellite technology drives broadband satellite networks to carry different traffic loads. However, traffic class routing of satellite cannot be provided by the existing 2 layerd satellite networks. In this paper, a 2 layered satellite network composed of low Earth orbit and medium Earth orbit satellite networks is presented, and a novel Self adapting Routing Protocol (SRP) is developed. This scheme aims to adopt self adapting routing algorithm to support different traffic classes. Meanwhile, the path discovery processing is invoked independently for each individual origin/destination pair. Simulation results are provided to evaluate the performance of the new scheme in terms of end to end delay, normalized data throughput, delay jitter and delivery ratio. 相似文献