共查询到18条相似文献，搜索用时 46 毫秒
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魏松杰;王佳贺;刘沛龙;程浩 《电子学报》2020,(10):1923-1927
针对LEO卫星网络在多跳转发数据包时流量分布不均问题,提出了一种基于不完全信息的最优收益路由联盟博弈算法.各节点协同联盟邻居节点,共同确定数据报文当前最优转发路径,从而分配和平衡节点间流量负载.仿真结果表明,与最短路径卫星路由DSP或智能路由TLR相比,本文算法的平均数据传输延迟降低了18.5%,节点流量负载均衡度提高了65.6%. 相似文献
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本文针对LEO极轨道卫星网络,提出一种基于IP的分布式路由算法。首先,从理论上分析了卫星问的最短路径问题,在此基础上设计了路由算法,最后通过仿真说明算法在低的计算、存储开销下,实现了快速、有效、准确的路由。 相似文献
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LEO卫星网络中一种安全的按需路由协议 总被引：1，自引：0，他引：1
低地球轨道(LEO)卫星网络的路由是当前卫星通信领域的研究热点,其安全问题也日益受到研究人员的重视。本文通过分析LEO卫星网络按需路由协议面临的安全威胁,使用基于身份的签密方案,提出了一种适合卫星网络拓扑特性的安全的按需路由协议。针对协议的密码算法处理时间开销较大的特点,设计了自适应的概率性延迟验证机制,能够降低协议的平均路由建立时间。安全性分析和仿真实验结果表明,该协议能够抵抗多种外部攻击行为,以有限的路由建立时间和路由开销为代价,保证了稳定的包传输率。 相似文献
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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
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In low earth orbit(LEO) satellite networks,in view of the unbalanced link resource,it's difficult to meet differentiated quality of service(QoS) requirements and easily lead to reduce the efficiency of the whole network.A routing algorithm based on multi-objective decision making was proposed which defined LEO satellite network transmission service as the delay sensitive,sensitive bandwidth and reliability sensitive three categories.It used the eigenvector method to calculate service weights,and used the consistency ratio to determine whether it can be accepted.Based on the multi-objective decision making theory,it combined with the actual state of satellite network nodes and links and the specific requirements of the business,calculating the path that meets the QoS requirements of the service,so as to realize the LEO satellite network multi objective dynamic routing optimization.Established simulation platform based on the iridium network system simulated network delay,the uncertain characteristics like the residual bandwidth and packet error rate,route planning for the randomly generated three classes of business.The simulation results show that,the algorithm not only satisfies the QoS constrain while balancing the traffic load of the satellite link effectively,but also improves the performance on the throughput. 相似文献
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Xuan Xie Linyu Huang Chengwen Tang Qian Ning 《International Journal of Satellite Communications and Networking》2023,41(5):427-440
The low-earth orbit (LEO) satellite network, composed of a large number of satellite nodes, is a hot research topic at present. Due to the characteristics of the large-scale LEO satellite network, such as many satellite nodes, short orbit period, large dynamic change of topology, and unstable link-state, its communication quality of service (QoS) requirements are difficult to meet. Aiming at this problem, various factors that may affect data transmission are first analyzed. The network link selection problem is modeled as a multi-constraint optimization decision problem, a routing mathematical model based on linear programming (LP) is designed, and its solution is solved. Aiming at the problem of limited onboard computing resources, a multi-object optimization Dijkstra algorithm (MOODA) is designed. The MOODA finds the optimal path according to the comprehensive performance of the link. It solves the problems of poor comprehensive QoS performance and the low degree of load balancing of the paths found by the Dijkstra algorithm. The simulation results show that the paths found by the two algorithms have good QoS, robustness, and load balancing performance. 相似文献
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Low earth orbit(LEO) satellite network provides global coverage and supports a wide range of services. However, due to the rapid changes and energy-limitation of satellites, how to meet the demand of the quality of service(QoS) from ground traffic and prolong the lifetime of LEO satellite network is the research emphasis of the investigator. Hence, a routing algorithm which takes into account the multi-QoS requirements and satellite energy consumption(QER) of LEO satellite network is proposed. Firstly, the satellite intimacy degree(SID) and the path health degree(PHD) are introduced to obtain the path evaluation function according to the energy consumption and queue state of the satellite. Then, the distributed routing QER is established through the path evaluation function and the idea of genetic algorithm(GA), which enables each satellite to adjust traffic and realizes the network load balancing. Simulation results show that QER performs well in terms of end-to-end delay, delay jitter, and system throughput. 相似文献
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在分析LEO卫星星座移动通信系统空间段网络功能和特点的基础上,进行了星座网络路由和交换技术体制的分析和论证,提出了以支持话音业务为主的LEO卫星移动通信系统星座网络路由和交换技术方案。星座网络采用定长信元格式交换体制,采用动态拓扑离散化的拓扑快照静态路由策略。这种静态路由离线计算方式和定长信元交换相结合,提高了网络交换的效率和转发速率。 相似文献
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针对传统微波测控通信系统通信速率与测量精度难以同时进一步提升的问题,提出了一种光载波下基于调相体制的高精度测距、测距与通信一体化方法,利用QPSK数字相干激光通信速率高的特点,设计综合信息帧格式,结合双向单程测距与非相干测速,在单个光载波下通过激光通信中的再生时钟得到比特相位级高精度测距信号,实现激光高速通信与高精度测量的一体化,提高信道的集成度。研制了包含两套光学天线及终端的原理样机,验证了星间双向非相干激光链路统一测控与星地双向非相干激光链路统一测控模式,结果表明,在1 550 nm波长无线光信道条件下,测距随机差（1σ）≤1 cm（0.78 cm @6 kHz多普勒动态）,测速随机差（1σ）≤1 cm/s（0.221 cm/s @ 6 kHz多普勒动态）,误码率≤1×10-9狜10 Gb/s单通道传输速率的性能指标,可为激光统一测控系统及激光星间链路设备等提供技术支撑。 相似文献
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Maurizio A. Bonuccelli Francesca Martelli Susanna Pelagatti 《Mobile Networks and Applications》2004,9(4):289-295
Clusters of mobile (LEO) satellites, flying at a non-geostationary orbit, have been recently proposed, designed and made operational for achieving a global coverage of roaming users. An example of these is Teledesic. The satellites of these clusters are equipped with a radio frequency switch and connected via intersatellite links to form a specific topology. Uncoordinated packet transmission in these systems may result in collisions. Collided packets must be retransmitted, with an obvious degradation in performance, in terms of both bandwidth usage and delay. This performance degradation can be overcome by a proper scheduling of the packets. In this paper, we consider optimal (namely minimum length) packet scheduling in LEO satellite clusters. We present a preprocessing algorithm which, together with the optimal, polynomial time, packet scheduling algorithm for isolated satellites, produces an optimal schedule in tree-connected clusters. The overall algorithm inherit the time complexity of the optimal one for isolated systems, and is O(N
4) for a cluster serving N roaming users. 相似文献
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首先分别分析了GEO层、MEO层、LEO层卫星的优缺点，接着简述了LEO＆MEO双层卫星网络的特点及对路由算法的要求，然后对已有的卫星网络路由算法进行简要分析，最后提出了一套适合LEO＆MEO双层卫星网络的动态路由技术。在拓扑快照DT-DVTR路由算法和MLSR的基础上，设计了动态路由算法，该路由算法采用了主动路由和按需路由相结合的方式，使得路由查找时间短、效率高。 相似文献
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LEO satellite networks can provide seamless real-time data communication for all kinds of users,which developed rapidly in recent years.At the mean time,the massive payload data down-link system of space data sources,such as remote sensing satellites,still make use of traditional storage and forward mode.The real-time performance of space mission data will be improved effectively,if such satellites are connected to LEO satellite networks equipped with inter satellite links.However,it is necessary to design a specialized satellite network load balancing routing algorithm.Satellite parallel edge-disjoint multipath routing protocol (SPEMR) was designed for remote sensing satellite real-time down-link applications.OPNET simulation results indicate that the performance degradation index(DI) of the multipath scheme implemented by SPEMR is 0.32,which is only 32% of the TLR and 21% of the traditional DSP scheme.It is demonstrated that SPEMR has the better capability of transmitting massive data in real time. 相似文献