【摘要】：因?yàn)樾l(wèi)星通信網(wǎng)絡(luò)有全球直接通信、信息快速傳遞、覆蓋范圍廣和不受地理環(huán)境限制等特點(diǎn),所以在軍事領(lǐng)域和民用工程上都有著廣泛的應(yīng)用。在不同需求場(chǎng)景下研究衛(wèi)星的資源分配,并使網(wǎng)絡(luò)承載能力達(dá)到最大,對(duì)于設(shè)計(jì)出較高性價(jià)的衛(wèi)星通信網(wǎng)絡(luò)有重大的指導(dǎo)意義。本文用網(wǎng)絡(luò)容量衡量整個(gè)網(wǎng)絡(luò)的承載能力,結(jié)合低軌道衛(wèi)星的通信環(huán)境,在設(shè)計(jì)了網(wǎng)絡(luò)容量分析方法的基礎(chǔ)上,研究了不同需求角度下衛(wèi)星帶寬和功率資源的分配方法。首先,建立了低軌道衛(wèi)星節(jié)點(diǎn)模型、星際鏈路模型和傳輸模型。然后,把網(wǎng)絡(luò)容量分為瞬時(shí)網(wǎng)絡(luò)容量和平均網(wǎng)絡(luò)容量,根據(jù)星座系統(tǒng)中星際鏈路的切換時(shí)刻,把網(wǎng)絡(luò)周期劃分成若干個(gè)時(shí)間片,通過在各個(gè)時(shí)間片內(nèi)選取大量采樣點(diǎn)的方法計(jì)算出時(shí)間片內(nèi)的平均網(wǎng)絡(luò)容量,再得出總體的網(wǎng)絡(luò)容量。最后,從不同的需求角度設(shè)計(jì)了不同的資源分配方法,主要包括基于容量最大化的資源分配方法、基于效用函數(shù)的資源分配方法和基于比例公平性的資源分配方法。其中,基于容量最大化的資源分配方法是一種理想化的分配方式,只以容量最大化為目標(biāo),不考慮相鄰衛(wèi)星的實(shí)際需求和公平性；基于效用函數(shù)的資源分配方法是在最大化相鄰衛(wèi)星滿意度的基礎(chǔ)上進(jìn)行資源分配；基于比例公平性的資源分配方法考慮了衛(wèi)星覆蓋區(qū)域內(nèi)地面站的數(shù)目和相應(yīng)星地鏈路存在時(shí)間。這三種資源分配方法都是非線性混合整數(shù)規(guī)劃問題,分別用具有整數(shù)操作的多種群云差分進(jìn)化算法和燕子群算法進(jìn)行優(yōu)化求解。為了驗(yàn)證本文設(shè)計(jì)的各種資源分配方法的可行性和有效性,本文利用衛(wèi)星仿真工具包STK(Satellite Tool Kit)產(chǎn)生銥星系統(tǒng)和全球星系統(tǒng)的衛(wèi)星軌道數(shù)據(jù),在Eclipse平臺(tái)上進(jìn)行仿真實(shí)現(xiàn)和性能對(duì)比。仿真結(jié)果表明,盡管不同資源分配方法下得出的網(wǎng)絡(luò)容量有些區(qū)別,但都體現(xiàn)出了衛(wèi)星網(wǎng)絡(luò)的承載能力會(huì)受到衛(wèi)星的軌跡和實(shí)際業(yè)務(wù)的影響。
[Abstract]:Because the satellite communication network has the characteristics of global direct communication, rapid information transmission, wide coverage and not restricted by geographical environment, so it has been widely used in military field and civil engineering. It is of great significance to study the resource allocation of satellites in different demand scenarios and to maximize the network carrying capacity, which is of great significance for the design of satellite communication networks with higher price. In this paper, the network capacity is used to measure the carrying capacity of the whole network. Combined with the communication environment of low orbit satellite, the method of network capacity analysis is designed, and the allocation method of satellite bandwidth and power resources under different demand angles is studied. Firstly, the low-orbit satellite node model, interstellar link model and transmission model are established. Then, the network capacity is divided into instantaneous network capacity and average network capacity. According to the switching time of interstellar link in constellation system, the network cycle is divided into several time slices. By selecting a large number of sampling points in each time slice, the average network capacity of the time slice is calculated, and the overall network capacity is obtained. Finally, different resource allocation methods are designed from different requirements, including capacity maximization based resource allocation, utility function based resource allocation and proportional equity based resource allocation. Among them, the resource allocation method based on capacity maximization is an idealized allocation method, which only aims at capacity maximization and does not consider the actual demand and fairness of adjacent satellites. The resource allocation method based on utility function is based on maximizing the satisfaction degree of adjacent satellites. The method of resource allocation based on proportional fairness takes into account the number of earth stations in the satellite coverage area and the time of existence of the corresponding satellite-earth link. These three resource allocation methods are all nonlinear mixed integer programming problems, which are solved by multi-group cloud differential evolution algorithm with integer operation and swallow swarm optimization algorithm respectively. In order to verify the feasibility and effectiveness of the various resource allocation methods designed in this paper, the satellite orbit data of Iridium system and all-star system are generated by using Satellite tool Kit (STK), and the simulation results and performance comparison are carried out on Eclipse platform. The simulation results show that although there are some differences in network capacity under different resource allocation methods, the bearing capacity of satellite network is affected by satellite trajectory and actual service.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN927.2

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