【摘要】：隨著科學(xué)技術(shù)的不斷發(fā)展,人們對(duì)太陽系的探索不再局限于月球及火星這些離地球較近的星體,人們開始對(duì)太陽系的其它星體進(jìn)行探測(cè)活動(dòng)。深空探測(cè)離不開深空通信的支持。在深空通信中,某些情況下直接鏈路無法可靠地傳輸信息,需要進(jìn)行中繼通信,構(gòu)建中繼通信網(wǎng)絡(luò)已經(jīng)成為了深空通信系統(tǒng)中不可或缺的一部分。星際互聯(lián)網(wǎng)就是由一些穩(wěn)定的、高效的、高容量的中繼衛(wèi)星節(jié)點(diǎn)構(gòu)成的深空網(wǎng)絡(luò)。它包括長距離基本單元之間的數(shù)據(jù)鏈路(直接鏈路或多跳鏈路),對(duì)空間探測(cè)器、宇宙空間站、太空飛船以及行星軌道器等提供導(dǎo)航定位信息、遙測(cè)遙控信息,對(duì)科學(xué)數(shù)據(jù)進(jìn)行存儲(chǔ)轉(zhuǎn)發(fā)。星際互聯(lián)網(wǎng)的鏈路具有不連續(xù)性、非對(duì)稱性、長延時(shí)等特點(diǎn)造成了研究深空網(wǎng)絡(luò)的復(fù)雜性。針對(duì)于此,本文首先系統(tǒng)地闡述了深空通信的發(fā)展及星際互聯(lián)網(wǎng)的結(jié)構(gòu),并論證了選擇拉格朗日點(diǎn)作為星際互聯(lián)網(wǎng)節(jié)點(diǎn)的可行性以及確定衛(wèi)星通信鏈路的選擇標(biāo)準(zhǔn)。星際互聯(lián)網(wǎng)是一種典型的延遲容忍網(wǎng)絡(luò)(Delay Tolerant Networking,DTN)。本文介紹了星際互聯(lián)網(wǎng)下的連接圖路由算法(Contact Graph Routing,CGR)在深空通信中尋找信息傳輸路徑的可行性和局限性,對(duì)應(yīng)用于靜態(tài)網(wǎng)絡(luò)的Dijkstra算法進(jìn)行改進(jìn),并提出了最短時(shí)間路徑算法和最小能量路徑算法。最后,利用衛(wèi)星仿真軟件(Satellite Tool Kit,STK)構(gòu)建星際互聯(lián)網(wǎng)場景,并對(duì)以拉格朗日點(diǎn)為中繼節(jié)點(diǎn)的星際互聯(lián)網(wǎng)進(jìn)行可見時(shí)間和鏈路距離的仿真。根據(jù)仿真數(shù)據(jù),分別對(duì)連接圖路由算法,最短時(shí)間路徑算法和最小能量路徑算法進(jìn)行了仿真分析及對(duì)比,證明了算法優(yōu)化的有效性。
[Abstract]:With the development of science and technology, the exploration of the solar system is no longer confined to the moon and Mars, which are close to the earth. Deep space exploration can not be separated from the support of deep space communication. In deep space communication, direct link can not transmit information reliably under some circumstances, so it is necessary to carry out relay communication. The construction of relay communication network has become an indispensable part of deep space communication system. Interstellar Internet is a deep space network composed of some stable, efficient, high capacity relay satellite nodes. It includes data links (direct or multi-hop links) between long distance basic units, navigation and positioning information for space probes, space stations, spacecraft and planetary orbiters, telemetry and remote control information. Store and forward scientific data. The discontinuity, asymmetry and long delay of interstellar Internet link make the research of deep space network more complicated. In this paper, firstly, the development of deep space communication and the structure of interstellar Internet are systematically described, and the feasibility of choosing Lagrangian point as interstellar Internet node and the selection standard of satellite communication link are demonstrated. Interstellar Internet is a typical delay tolerant network called (Delay Tolerant networking. This paper introduces the feasibility and limitation of (Contact Graph routing algorithm in deep space communication, and improves the Dijkstra algorithm used in static network. The shortest time path algorithm and the minimum energy path algorithm are proposed. Finally, the interstellar Internet scene is constructed by using the satellite simulation software (Satellite Tool Kit STK, and the visible time and link distance of the interstellar Internet with Lagrange as relay node are simulated. According to the simulation data, the link graph routing algorithm, the shortest time path algorithm and the minimum energy path algorithm are simulated and compared respectively, which proves the effectiveness of the algorithm optimization.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN927

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