基於雷射指向精度的 ISL 品質估計繞送法

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姓名

李敬華(Jing-Hua Lee) 查詢紙本館藏

畢業系所

資訊工程學系

論文名稱

基於雷射指向精度的 ISL 品質估計繞送法
(Laser Pointing Accuracy Based ISL Quality Estimation Algorithm)

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摘要(中)

近期衛星網路快速發展，低地球軌道衛星網路營運商開始建立衛星間通訊，以克服 LEO 衛星服務範圍小的問題。最新的衛星間通訊科技：雷射通訊，是衛星間通訊的首選。比起傳統的微波通訊，雷射通訊可以提供更具優勢的傳輸效能。然而雷射通訊需要準確的天線指向精度，才可以維持雷射的傳輸優勢。衛星受太空環境影響，常會發生不可預測的衛星間鏈路故障，這使衛星網路拓撲頻繁的變化。故障的衛星間鏈路與指向精確度低的衛星間鏈路會嚴重降低衛星網路的性能。通過衛星間的對位置，本文分析了衛星間的雷射天線指向精度對
傳輸造成的影響，並提出了基於雷射指向精度的衛星間鏈路品質估計繞送法。最終實驗結果表明，我們的方法能使衛星網路傳輸延遲降低，且有較高的封包傳輸率。鏈路使用率不平均是我們的方法稍有不足之處。

摘要(英)

Recently, satellite networks have rapidly developed, and low Earth orbit (LEO) satellite network operators have begun establishing inter-satellite link (ISL) to overcome the service coverage limit of the entire network. ISL allows satellite network operators to expand their service coverage without the need to construct additional ground stations. Advanced ISL technology, laser communication, is the preferred choice for LEO satellite network operators. Compared to traditional microwave communication, laser communication offers superior transmission performance. However, laser communication requires precise antenna pointing accuracy to maintain its transmission advantages. Satellites are affected by the space environment, leading to unpredictable ISL failures, which cause frequent changes in satellite network topology. Fail ISL and ISL with low pointing accuracy can severely decrease the performance of satellite networks. Through satellite-to-satellite positioning, this paper analyzes the impact of laser antenna pointing accuracy on ISL transmission, and we propose Laser Pointing Accuracy Based ISL Quality Estimation Algorithm. The final experimental results indicate that our method can reduce transmission latency in satellite networks and achieve a higher packet delivery rate. Uneven link utilization is a slight disadvantage of our method.

關鍵字(中)

★ 衛星星座網路
★ 低軌衛星
★ 軌道
★ 路由
★ 鏈路失效
★ 指向精度
★ 雷射通訊

關鍵字(英)

★ Satellite network
★ Low earth orbit satellites
★ Orbits
★ Routing
★ Link failure
★ Pointing accuracy
★ Laser communication

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 Related Work 5
2.1 Central Routing Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Distribute Routing Algorithm . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Hybrid Routing Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 System Model 11
3.1 Satellite Network Topology . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Pointing Errors on Signal Intensity Losses . . . . . . . . . . . . . . . . . 14
3.3 Type of Pointing Error . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Methodology 17
4.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2 Two-Line Element Set . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3 Simplified Perturbations Models . . . . . . . . . . . . . . . . . . . . . . 18
4.4 Along-track Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5 Elevation of Pointing Offset . . . . . . . . . . . . . . . . . . . . . . . . 23
4.6 Azimuth of Pointing Offset . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.7 Elevation and Azimuth of Along-track Error . . . . . . . . . . . . . . . . 25
4.8 Compensation time for pointing error . . . . . . . . . . . . . . . . . . . 28
4.9 Routing Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5 Performance Evaluation 33
6 Conclusion 38
Bibliography 39

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指導教授

張貴雲(Guey-Yun Chang)

審核日期

2024-7-26

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