临近空间自适应组网关键技术的研究

发布时间：2018-06-14 21:56

本文选题：临近空间自组网 + 路由协议　；参考：《电子科技大学》2014年硕士论文

【摘要】：临近空间平台下临近空间飞行器具备比飞机更广的覆盖域,临近空间在军事方面的应用成为了各国研究的热点。临近空间自组网能够高效、快速的组网,因此,具备了很高的研究价值。本文主要研究临近空间网络体系结构中接入网的路由协议,以及主干网、接入网、机间网络中的接入协议。基于链路稳定性的路由协议的研究。针对临近空间节点个数繁多以及节点移动的特点,为降低路由开销、提高路由性能,因此,在路由协议设计时需考虑洪泛范围以及链路稳定性。本文通过对洪泛范围设计,在保证有效路径个数的基础上,减少网络中控制开销。并在此基础上,对临近空间飞行器移动模型进行分析,根据临近空间飞行器作战任务不同,将其分为不同的移动群组,群组间选择参考点群组移动模型(RPGM),群组内选择随机路点移动模型(RWM)。由节点的移动模型可知,节点的运动具有规律性,因此通过学习节点过去一段时间内运动状态,得到节点间运动状态序列,根据该运动序列的马尔科夫性得到链路稳定性状态值。在兼顾跳数的条件下,选择连乘积准则计算路径稳定性值。基于统计业务优先级的接入协议的研究。针对临近空间节点种类以及业务种类繁多的特点,为降低信道碰撞次数、提高重要信息的接入性能,因此,在接入协议设计时需考虑信道碰撞状况以及不同业务、节点的接入性能。接入协议通过侦听过去一段时间内信道碰撞次数,将其与预先设定的门限值进行对比,只有当小于门限值时,才允许发送分组。同时,本文将临近空间业务进行分类,并对其按时延敏感度进行优先级划分,并且将临近空间节点按重要性进行划分。在此基础上,为保证高优先级的业务和高级节点的接入性能,设计基于优先级退避算法,使得高优先级业务或高级用户竞争窗口值小于其他业务或用户,从而获得较小的退避时延。最后,利用OPNET仿真软件对路由协议和接入协议进行仿真,仿真结果表明,路由协议在不同节点个数以及不同移动速度条件下,具有较高分组递送率以及较低的平均断裂次数。接入协议在不同负载的条件下,高优先级业务和高级用户的平均端到端时延和分组递送率低于其他业务或用户,并且与传统CSMA协议相比,不同用户或业务的网络性能均优于不划分优先级情况下。
[Abstract]:The near space vehicle has a wider coverage area than the aircraft under the near space platform, and the military application of the near space has become a hot topic in various countries. Adjoining space ad hoc network is efficient and fast, so it has high research value. In this paper, the routing protocols of access network in the architecture of adjacent space network, as well as the access protocols in the backbone network, access network and inter-computer network are studied. Research on routing Protocol based on Link Stability. In order to reduce routing overhead and improve routing performance, flood coverage and link stability should be considered in the design of routing protocols in view of the large number of nodes in adjacent space and the mobility of nodes. In this paper, the flood scope is designed to reduce the control overhead on the basis of ensuring the number of effective paths. On this basis, the moving model of the near space vehicle is analyzed. According to the different combat tasks of the near space vehicle, it is divided into different mobile groups. The group moving model of selecting reference points among groups is RPGMN, and the random path moving model of group selection is RWMN. According to the moving model of nodes, the movement of nodes is regular, so by learning the motion state of nodes over a period of time, the sequence of motion states between nodes is obtained. According to the Markov property of the motion sequence, the link stability state value is obtained. Under the condition of taking into account the number of hops, the continuous product criterion is chosen to calculate the path stability value. Research on access Protocol based on Statistical Service priority. In order to reduce the number of channel collisions and improve the access performance of important information, in order to reduce the number of channel collisions and improve the access performance of important information, in order to reduce the number of channel collisions and improve the access performance of important information, the channel collision status and different services should be considered in the design of access protocols. Node access performance. By listening for the number of channel collisions over a period of time, the access protocol compares it with the pre-set threshold, and only allows the transmission of packets when the threshold is less than the threshold. At the same time, the adjacent space business is classified, and its time-delay sensitivity is prioritized, and the adjacent space node is divided according to its importance. On this basis, in order to ensure the access performance of high-priority services and high-level nodes, a priority-based Backoff algorithm is designed, which makes the competing window value of high-priority services or advanced users smaller than that of other services or users. Thus, a smaller Backoff delay is obtained. Finally, the routing protocol and access protocol are simulated with OPNET simulation software. The simulation results show that the routing protocol has higher group delivery rate and lower average breaking times under different node numbers and different moving speeds. Under different load conditions, the average end-to-end delay and packet delivery rate of high-priority services and advanced users are lower than those of other services or users, and compared with traditional CSMA protocols. The network performance of different users or services is better than that without priority.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：V243.1;TN915.04

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