【摘要】：衛(wèi)星網(wǎng)絡(luò)多址接入?yún)f(xié)議的設(shè)計(jì)關(guān)乎整個(gè)衛(wèi)星通信系統(tǒng)的信道資源利用率和業(yè)務(wù)的QoS,要想既高效占用信道資源又滿(mǎn)足各種業(yè)務(wù)的QoS,必須設(shè)計(jì)合理的衛(wèi)星網(wǎng)絡(luò)多址接入?yún)f(xié)議。另一方面,接入衛(wèi)星網(wǎng)絡(luò)的用戶(hù)身份是未知的,如果任意用戶(hù)都可以接入衛(wèi)星網(wǎng)絡(luò)進(jìn)行通信,那么衛(wèi)星網(wǎng)絡(luò)將會(huì)存在極大的安全隱患,只有通過(guò)衛(wèi)星通信系統(tǒng)認(rèn)證的用戶(hù)才可以接入并獲取服務(wù),所以設(shè)計(jì)合理的衛(wèi)星網(wǎng)絡(luò)接入認(rèn)證方法至關(guān)重要。本文對(duì)現(xiàn)有衛(wèi)星網(wǎng)絡(luò)多址接入?yún)f(xié)議與認(rèn)證方法進(jìn)行歸納總結(jié),分析了目前多址接入?yún)f(xié)議與認(rèn)證方法的優(yōu)缺點(diǎn)以及現(xiàn)有的方法用于衛(wèi)星網(wǎng)絡(luò)中存在的問(wèn)題。本文提出了基于灰色預(yù)測(cè)的混合自由/按需分配多址接入?yún)f(xié)議,在接入方面,加入了灰色預(yù)測(cè)方法,使得用戶(hù)預(yù)約的時(shí)隙數(shù)要多于現(xiàn)有的突發(fā)分組數(shù);在帶寬分配方面,加入了用戶(hù)優(yōu)先級(jí)分配算法,給用戶(hù)需求高的用戶(hù)設(shè)置更高的優(yōu)先級(jí),優(yōu)先分配衛(wèi)星信道資源。通過(guò)OPNET對(duì)該協(xié)議進(jìn)行仿真建模,實(shí)驗(yàn)結(jié)果表明該協(xié)議在吞吐量和端到端時(shí)延方面表現(xiàn)出較好的性能,提高了整個(gè)系統(tǒng)的信道利用率。另一方面,本文提出了基于信關(guān)站的衛(wèi)星網(wǎng)絡(luò)匿名認(rèn)證方法,采用MD5算法生成消息認(rèn)證碼,實(shí)現(xiàn)衛(wèi)星網(wǎng)絡(luò)與用戶(hù)的雙向認(rèn)證,并將大部分的認(rèn)證工作從網(wǎng)絡(luò)控制中心(NCC)轉(zhuǎn)移到衛(wèi)星網(wǎng)絡(luò)中的信關(guān)站上,大大降低了網(wǎng)絡(luò)控制中心(NCC)的計(jì)算量。將該方法與現(xiàn)有的幾種衛(wèi)星網(wǎng)絡(luò)認(rèn)證方法進(jìn)行安全性對(duì)比分析,并通過(guò)網(wǎng)絡(luò)編程仿真,實(shí)驗(yàn)結(jié)果驗(yàn)證了該方案的可行性。
[Abstract]:The design of satellite network multiple access protocol is related to the utilization of channel resources and QoS of the whole satellite communication system. In order to occupy channel resources efficiently and satisfy the QoS of all kinds of services, a reasonable satellite network multiple access protocol must be designed. On the other hand, the identity of the users accessing the satellite network is unknown. If any user can access the satellite network for communication, then the satellite network will have a great security hazard. Only users who are authenticated by satellite communication system can access and obtain services, so it is very important to design a reasonable method of satellite network access authentication. This paper summarizes the existing multiple access protocols and authentication methods for satellite networks, analyzes the advantages and disadvantages of the current multiple access protocols and authentication methods and the existing problems in satellite networks. In this paper, a hybrid free / on-demand multiple access protocol based on grey prediction is proposed. In the access aspect, the gray prediction method is added, which makes the number of slots reserved by the user more than the number of existing burst packets, and in the aspect of bandwidth allocation, The user priority allocation algorithm is added to set a higher priority for users with high user requirements and to assign satellite channel resources first. The simulation model of the protocol is simulated by OPNET. The experimental results show that the protocol performs well in throughput and end-to-end delay, and improves the channel utilization of the whole system. On the other hand, this paper proposes an anonymous authentication method for satellite network based on Xinguan station, which uses MD5 algorithm to generate message authentication code to realize two-way authentication between satellite network and users. Most of the authentication work is transferred from the network control center (NCC) to the communication station in the satellite network, which greatly reduces the computation of the network control center (NCC). The security of this method is compared with several existing satellite network authentication methods, and the feasibility of the scheme is verified by network programming simulation.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN927.2

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本文編號(hào)：2167955