發(fā)布時間：2018-03-21 18:43

  本文選題：雙層衛(wèi)星網(wǎng)絡(luò)　切入點(diǎn)：星座設(shè)計(jì)　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：混合衛(wèi)星網(wǎng)絡(luò)是為了彌補(bǔ)單層衛(wèi)星網(wǎng)絡(luò)的缺點(diǎn)而產(chǎn)生的，它綜合了各單層衛(wèi)星網(wǎng)絡(luò)的優(yōu)點(diǎn)，形成優(yōu)勢互補(bǔ)，為用戶提供更好的服務(wù)質(zhì)量�；旌闲l(wèi)星網(wǎng)絡(luò)的形式有很多，其共同點(diǎn)是都包含有多顆衛(wèi)星，多顆衛(wèi)星對地面的覆蓋使得衛(wèi)星接入算法對混合衛(wèi)星網(wǎng)絡(luò)的性能起到關(guān)鍵性的作用。不同的衛(wèi)星接入算法對衛(wèi)星的服務(wù)質(zhì)量的影響各不相同，因此如何設(shè)計(jì)更好的混合衛(wèi)星網(wǎng)絡(luò)和衛(wèi)星接入算法是目前研究的重點(diǎn)。本文根據(jù)對混合衛(wèi)星網(wǎng)絡(luò)特點(diǎn)的分析，設(shè)計(jì)了5GEO+66LEO的雙層衛(wèi)星網(wǎng)絡(luò)并提出了多QoS約束的衛(wèi)星接入算法，具體內(nèi)容如下： 首先，本文對混合衛(wèi)星網(wǎng)絡(luò)的結(jié)構(gòu)和衛(wèi)星接入算法的研究現(xiàn)狀進(jìn)行分析，在此基礎(chǔ)上比較了各種衛(wèi)星網(wǎng)絡(luò)的優(yōu)缺點(diǎn)，總結(jié)了單層衛(wèi)星網(wǎng)絡(luò)的缺點(diǎn)，并探討混合衛(wèi)星網(wǎng)絡(luò)的優(yōu)點(diǎn)。同時對已有的混合衛(wèi)星網(wǎng)絡(luò)進(jìn)行簡單的介紹，對混合衛(wèi)星網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)進(jìn)行分析。接下來，結(jié)合仿真結(jié)果，本文深入地分析和研究了典型衛(wèi)星接入算法的性能。 其次，在分析了GEO、MEO、LEO和HEO衛(wèi)星網(wǎng)絡(luò)各自的特點(diǎn)之后，綜合其性能的好壞和設(shè)計(jì)實(shí)現(xiàn)的難易程度，本文設(shè)計(jì)并提出了5GEO+66LEO的雙層衛(wèi)星網(wǎng)絡(luò)，該雙層衛(wèi)星網(wǎng)絡(luò)中GEO和LEO衛(wèi)星網(wǎng)絡(luò)互相彌補(bǔ)了對方的不足之處，再加上GEO衛(wèi)星技術(shù)成熟，LEO衛(wèi)星實(shí)現(xiàn)容易，使得該雙層衛(wèi)星網(wǎng)絡(luò)具有很高的可實(shí)現(xiàn)性。同時，使用STK搭建了該雙層衛(wèi)星網(wǎng)絡(luò)模型，并對其可見性、覆蓋特性和星間鏈路特性進(jìn)行分析。 最后，本文深入地分析和比較了典型的衛(wèi)星接入算法，并在此基礎(chǔ)上提出了多QoS約束的衛(wèi)星選擇算法。典型的衛(wèi)星接入算法是從衛(wèi)星的角度出發(fā)，通過分析衛(wèi)星對用戶的覆蓋時間、用戶到衛(wèi)星的距離和衛(wèi)星網(wǎng)絡(luò)負(fù)載三個方面性能的好壞，選擇合適的衛(wèi)星進(jìn)行接入。而本文提出的算法主要考慮用戶的要求和衛(wèi)星所提供的服務(wù)之間的差異度，選擇差異度最小的衛(wèi)星進(jìn)行接入。接下來通過仿真分析，驗(yàn)證了該算法的正確性，同時將該算法和典型的衛(wèi)星接入算法進(jìn)行比較，證明了本文算法可以降低呼叫阻塞率、切換失敗概率和強(qiáng)制中斷概率，同時使網(wǎng)絡(luò)平均負(fù)載維持較高的水平，，實(shí)現(xiàn)網(wǎng)絡(luò)接入性能的提高。
[Abstract]:Hybrid satellite network is produced to compensate for the shortcomings of single-layer satellite network. It combines the advantages of each single-layer satellite network, forms a complementary advantage, and provides users with better quality of service. There are many forms of hybrid satellite network. The common point is that there are many satellites, and the ground coverage of multiple satellites makes satellite access algorithms play a key role in the performance of hybrid satellite networks. Different satellite access algorithms have different effects on the quality of service of satellites. Therefore, how to design better hybrid satellite network and satellite access algorithm is the focus of current research. Based on the analysis of the characteristics of hybrid satellite network, the double-layer satellite network of 5GEO 66LEO is designed and a multi-#en0# constrained satellite access algorithm is proposed. The details are as follows:. Firstly, the structure of hybrid satellite network and the research status of satellite access algorithm are analyzed in this paper. On this basis, the advantages and disadvantages of various satellite networks are compared, and the shortcomings of single-layer satellite network are summarized. The advantages of hybrid satellite network are also discussed. At the same time, the existing hybrid satellite network is briefly introduced, and the topology of hybrid satellite network is analyzed. The performance of typical satellite access algorithms is analyzed and studied in this paper. Secondly, after analyzing the characteristics of GEOOOOLEO and HEO satellite networks, and synthesizing their performance and the degree of difficulty in design and implementation, this paper designs and proposes a double-layer satellite network based on 5GEO 66LEO. In this double-layer satellite network, GEO and LEO satellite network make up for each other's shortcomings, and the GEO satellite technology is mature and easy to realize, which makes the double-layer satellite network highly realizable. The two-layer satellite network model is built with STK, and its visibility, coverage and intersatellite link characteristics are analyzed. Finally, this paper deeply analyzes and compares the typical satellite access algorithms, and puts forward a satellite selection algorithm with multiple QoS constraints. By analyzing the coverage time of the satellite to the user, the distance from the user to the satellite and the load of the satellite network, The algorithm proposed in this paper mainly considers the difference between the user's requirements and the service provided by the satellite, and selects the satellite with the least difference to access. The correctness of the algorithm is verified and compared with the typical satellite access algorithm. It is proved that the proposed algorithm can reduce call blocking probability, handoff failure probability and forced interrupt probability. At the same time, the average load of the network is maintained at a high level, and the network access performance is improved.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN927.2

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 毛騰躍;徐正全;朱容波;侯睿;;下一代衛(wèi)星網(wǎng)絡(luò)發(fā)展研究[J];電信科學(xué);2012年06期

2 杜宗n

本文編號：1645085