發(fā)布時間：2018-07-22 10:19

【摘要】：隨著星上處理和星際鏈路技術(shù)的出現(xiàn),衛(wèi)星網(wǎng)絡(luò)已經(jīng)發(fā)展成為覆蓋全球的新型互聯(lián)網(wǎng),并在通信領(lǐng)域中的地位不斷提高。衛(wèi)星網(wǎng)絡(luò)具有覆蓋范圍廣、布置迅速、組網(wǎng)靈活、抗毀性強且不受地理環(huán)境限制等顯著特點,能夠?qū)Φ孛婢W(wǎng)絡(luò)進行有效的補充和完善,無論在軍事領(lǐng)域還是民用領(lǐng)域均發(fā)揮著重要的作用。為順應(yīng)用戶群體不斷壯大和對多媒體業(yè)務(wù)需求的不斷增長,如何構(gòu)建高效、可靠的衛(wèi)星網(wǎng)絡(luò)具有極其重要的經(jīng)濟應(yīng)用價值。為此,本文將網(wǎng)絡(luò)容量作為衛(wèi)星網(wǎng)絡(luò)設(shè)計和規(guī)劃的性能指標(biāo),為提高衛(wèi)星網(wǎng)絡(luò)資源效率、提升網(wǎng)絡(luò)業(yè)務(wù)保障能力提供更為直觀的參考。通過對多層衛(wèi)星網(wǎng)絡(luò)特點的充分分析,本文設(shè)計了一種針對于多層衛(wèi)星網(wǎng)絡(luò)的基于星際鏈路選擇的網(wǎng)絡(luò)容量分析方法。首先,建立了相應(yīng)的網(wǎng)絡(luò)模型、節(jié)點模型、信道模型、傳輸模型和干擾模型,清楚地刻畫信道帶寬、發(fā)送功率、噪聲干擾對星際鏈路性能的影響；其次,從地理因素、時間因素、設(shè)備因素、服務(wù)類型及QoS (Quality of Service)需求四方面對衛(wèi)星網(wǎng)絡(luò)的業(yè)務(wù)進行刻畫,動態(tài)模擬了衛(wèi)星網(wǎng)絡(luò)所承載業(yè)務(wù)的流向；然后,利用本文所提出星際路由策略,綜合考慮QoS滿意度、服務(wù)定價滿意度、生存周期適合度和負(fù)載適合度進行多屬性決策,模擬了衛(wèi)星節(jié)點對星際鏈路的動態(tài)切換,建立衛(wèi)星網(wǎng)絡(luò)運行狀態(tài)下的拓?fù)浣Y(jié)構(gòu)；最后,為克服衛(wèi)星網(wǎng)絡(luò)動態(tài)變化特點,采用時隙劃分的方式進行分析,基于改進的分布式遺傳算法搜索衛(wèi)星資源分配的最佳方案,尋求衛(wèi)星網(wǎng)絡(luò)容量的上限和下限。本文利用STK (Satellite Tool Kit)軟件進行衛(wèi)星運動軌跡和星間可見性分析,在VC++平臺仿真實現(xiàn)了本文所提出的網(wǎng)絡(luò)容量分析方法。然后與基準(zhǔn)算法進行性能對比,并測試分析了路由策略、突發(fā)干擾和星座結(jié)構(gòu)對衛(wèi)星網(wǎng)絡(luò)容量的影響。仿真結(jié)果表明,本文所設(shè)計的針對多層衛(wèi)星網(wǎng)絡(luò)的網(wǎng)絡(luò)容量分析方法是可行且有效的,與基準(zhǔn)算法相比擁有更好的收斂性能和搜索精度,且對網(wǎng)絡(luò)容量影響因素的測試分析結(jié)果能夠為衛(wèi)星網(wǎng)絡(luò)設(shè)計和規(guī)劃提供參考。
[Abstract]:With the appearance of onboard processing and interstellar link technology, satellite network has developed into a new type of Internet covering the whole world, and its status in the field of communication has been increasing. Satellite network has the characteristics of wide coverage, rapid layout, flexible networking, strong invulnerability and not restricted by geographical environment, which can effectively supplement and perfect the ground network. Both in the military and civilian fields are playing an important role. In order to adapt to the continuous growth of user groups and the increasing demand for multimedia services, how to build an efficient and reliable satellite network has an extremely important economic application value. Therefore, this paper regards network capacity as the performance index of satellite network design and planning, which provides a more intuitive reference for improving the efficiency of satellite network resources and enhancing the network service support ability. By fully analyzing the characteristics of multilayer satellite networks, a network capacity analysis method based on interstellar link selection for multilayer satellite networks is designed in this paper. Firstly, the corresponding network model, node model, channel model, transmission model and interference model are established, which clearly describe the influence of channel bandwidth, transmission power and noise interference on the performance of interstellar link. Time factor, equipment factor, service type and QoS (quality of Service) requirement are used to describe the service of satellite network, and the flow direction of the service carried by satellite network is simulated dynamically. Considering QoS satisfaction, service pricing satisfaction, life cycle fitness and load suitability, multi-attribute decision is made, and the dynamic switching of satellite nodes to interstellar links is simulated, and the topology of satellite network is established. In order to overcome the dynamic characteristics of satellite network, time slot division is used to analyze the optimal scheme of satellite resource allocation based on improved distributed genetic algorithm, and the upper and lower limits of satellite network capacity are sought. In this paper, STK (Satellite tool Kit) software is used to analyze the orbit of satellite motion and the visibility between satellites, and the network capacity analysis method proposed in this paper is realized by simulation on VC platform. Then compared with the benchmark algorithm, the effects of routing strategy, burst interference and constellation structure on the capacity of satellite network are tested and analyzed. The simulation results show that the proposed network capacity analysis method for multilayer satellite networks is feasible and effective, and has better convergence performance and search accuracy than the benchmark algorithm. The test results of the influence factors of network capacity can provide reference for satellite network design and planning.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN927.2

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本文編號：2137090