在非球型擾動下的低軌衛星路由網路設計

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姓名

鄭馥緯(Fu-Wei Cheng) 查詢紙本館藏

畢業系所

資訊工程學系

論文名稱

在非球型擾動下的低軌衛星路由網路設計
(LEO satellite network routing algorithm in non-spherical earth)

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至系統瀏覽論文 ( 永不開放)

摘要(中)

衛星通訊最近變得流行，因為它可以為地球上的任何位置提供服務，不受地理限制。儘管具有優勢，低地球軌道衛星網絡仍面臨不可預測的鏈路故障和頻繁的拓撲變化。地球的扁率使得衛星繞赤道和星座邊界運行時高度會發生變化，而由於衛星之間的距離較遠，指向精度是衛星間通訊的關鍵問題。然而，相鄰衛星相對位置的變化會降低指向精度。通過衛星的周期性變化，本文提出了星間鏈路質量估計模型和基於鏈路質量的路由算法。此外，我們還考慮了衛星和地面站切換帶來的延遲問題。為了解決這個問題，我們提出了一種數據包轉發機制來避免數據包丟失。最終的實驗結果還表明，我們的方法犧牲了一點性能，與其他方法相比，它具有更好的數據包傳輸率。

摘要(英)

Satellite communication recently becomes popular as it can provide services to any location on Earth without geographical limitations. Despite its advantages, low Earth orbit satellite networks face unpredictable link failures and frequent topological changes. The oblateness of the Earth makes the altitude changes as they travel around the equator and boundary of constellation, and because of the long distances between satellites, pointing accuracy is a critical issue in inter satellite communication. However, the changing relative position (resulting from oblateness of the earth) of a neighboring satellites significantly reduces pointing accuracy. Through the periodic variations of satellites, in this paper, we proposed a inter-satellite link quality estimation model, and a link-quality-based routing algorithm. In addition, we consider the delay issue caused by satellite and ground station handover. To tacle this issue, we propose a packet forwarding mechanism to avoid packet loss. The final experimental results also indicate that our method sacrifices a little of performance, it performs better packet delivery rate compared to other methods.

關鍵字(中)

★ 低軌衛星
★ 軌道
★ 路由
★ 鏈路失效

關鍵字(英)

★ Low earth orbit satellites
★ Orbits
★ Routing
★ Link failure

論文目次

中文摘要 i
Abstract ii
致謝 iii
Contents iv
List of Figures vi
List of Tables viii
1 Introduction 1
2 Background 4
2.1 Laser Inter-satellite Link 4
2.2 Satellite ground station interconnection methodology 5
3 Related Work 6
3.1 Central Routing 7
3.1.1 Central Routing for link failure 7
3.1.2 Laser Point error 7
3.2 Distribute Routing Algorithm 9
3.3 Hybrid Routing Algorithm for link failure 9
4 System Model 11
4.1 Constellation and Network Topology 11
4.2 Satellite Link Interface 12
5 Methodology 13
5.1 The Non-spherical Earth Perturbation 13
5.2 Optical link pointing accuracy 17
5.3 Adaptive routing algorithm 18
5.4 Routing algorithm 19
5.5 Topology update of satellite network 20
5.6 Satellite-to-ground station communication 21
5.7 Random Fail Path 23
6 Performance Evaluation 24
7 Conclusion 30
Bibliography 31
Appendices 34
.1 Main path 35
.2 Link recovery check mechanism 37

參考文獻

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指導教授

張貴雲(Guey-Yun Chang)

審核日期

2023-8-8

推文