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研究生： 蕭維昭
Siao, Wei-Jau
論文名稱： 基於第二代數位視訊廣播通訊協定的立方衛星星際通訊收發機架構與實現
Design and Implementation of an Interstellar Communication Transceiver Architecture Based on the DVB-S2 (Digital Video Broadcasting-Satellite-Second Generation) Protocol
指導教授： 莊智清
Juang, Jyh-Ching
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 電機工程學系
Department of Electrical Engineering
論文出版年： 2025
畢業學年度： 113
語文別： 英文
論文頁數： 97
中文關鍵詞： 立方衛星 、DVB-S2 、衛星間通訊
外文關鍵詞： CubeSat, DVB-S2, Inter-Satellite Link
相關次數： 點閱：5  下載：3 
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    • 近年來，隨著太空產業的迅速發展與低軌道衛星技術的日益成熟，全球對衛星系統的應用需求呈現爆炸性成長。傳統部署於中高軌道的大型衛星，雖然具備穩定的廣域通訊能力，但在建置成本、佈署彈性以及回應即時需求等方面已逐漸無法滿足現代通訊與數據應用的高度彈性與即時性需求。
    相較之下，立方衛星（cubesat）以其小型化、低成本、高佈署效率與快速更新等特性，近年來成為新一代衛星應用的重要趨勢。不僅在學術研究與教育領域受到關注，更逐步推進至商業、通訊、遙測與太空探索等實務應用中。
    然而，隨著應用場景日益複雜與數據需求不斷提升，僅依賴單一衛星與地面站之間的傳統通聯架構已無法應對未來多節點、高頻寬、低延遲的星上任務需求。因此，衛星間通訊（Inter-Satellite Links, ISL）成為實現高效衛星網路、構建自主星座通訊能力的關鍵技術。
    第二代數位視訊廣播通訊協定 (DVB-S2) 通訊協定是目前廣泛應用於傳統大型衛星的一種高效能通訊標準，其具有優異的頻譜效率、靈活的調變編碼支援能力、以及強大的前向錯誤更正機制，使其成為高可靠通訊系統設計的理想候選。 本研究針對立方衛星的硬體限制與任務特性，提出一套基於 DVB-S2 通訊協定之收發機架構設計與實作方法，並進行模擬驗證與效能評估，以探討其在衛星間通訊應用上的可行性與實用性。此外，該收發模組預計整合至預定於 2025 年底發射之 Lilium-2 與 Lilium-3 任務衛星中，進行實際的衛星間通聯任務，驗證系統於軌道環境中的實際表現與通訊穩定性。

    In recent years, the rapid development of the space industry and the growing maturity of low Earth orbit (LEO) satellite technologies have led to an explosive increase in global demand for satellite-based applications. While traditional large satellites deployed in medium and high Earth orbits offer stable wide-area communication capabilities, they are increasingly unable to meet the modern requirements for flexibility, cost-efficiency, and real-time responsiveness in communications and data services.
    In addition, cubesats have emerged as a key trend in next-generation satellite applications due to their advantages in miniaturization, low cost, high deployment efficiency, and rapid iteration. Initially popular in academic and educational contexts, cubesats are now expanding into practical applications in commercial services, telecommunications, remote sensing, and space exploration.
    However, as mission scenarios become more complex and data demands continue to grow, traditional point-to-ground communication architectures are no longer sufficient to support future space missions requiring multi-node networking, high bandwidth, and low latency. Consequently, inter-satellite links (ISL) have become a critical enabling technology for building efficient satellite networks and autonomous communication constellations.
    The Digital Video Broadcasting - Satellite - Second Generation (DVB-S2) protocol, widely adopted in traditional large satellite systems, offers excellent spectral efficiency, flexible modulation and coding schemes, and robust Forward Error Correction (FEC) mechanisms, making it a strong candidate for designing high-reliability communication systems.
    This study proposes a transceiver architecture and implementation methodology based on the DVB-S2 protocol, specifically tailored for the hardware constraints and mission characteristics of cubesats. Simulation and performance evaluation are conducted to assess its feasibility and practicality in inter-satellite communication scenarios. The proposed transceiver module is scheduled to be integrated into the Lilium-2 and Lilium-3 satellites, set for launch at the end of 2025, where it will undergo in-orbit testing to validate its performance and communication stability in a real operational environment.

    摘要 I Abstract III Contents VI List of Tables IX List of Figures X List of Abbreviations XIV Chapter 1 Introduction 1 1.1 Objective and Motivation 1 1.2 Literature Survey 2 1.3 Contribution 5 1.4 Thesis Organization 5 Chapter 2 System Overview 7 2.1 Lilium- 2 & 3 CubeSats 7 2.2 Antenna 9 2.3 Transceiver 11 2.4 DVB - S2 12 2.5 Mission scenario 13 Chapter 3 Signal Processing Architecture Design 16 3.1 Transmitter Signal Processing 16 3.1.1 Mode Adaption 17 3.1.2 Stream Adaptation 19 3.1.3 FEC encoding 20 3.1.3.1 Outer encoding (BCH) 21 3.1.3.2 Inner Code (LDPC) 22 3.1.4 Bit mapping into QPSK constellation 23 3.1.5 PL framing 24 3.1.6 Modulation 26 3.2 Proposed Receiver Signal Processing Architecture 27 3.2.1 PLHEADER detection 28 3.2.1.1 Coarse Frequency Correction 28 3.2.1.2 Cross correlation 30 3.2.2 Time synchronization 31 3.2.2.1 Polyphase filter 32 3.2.2.2 Error detector 34 3.2.2.3 Mapping 35 3.2.3 Frequency correction 36 3.2.3.1 CMA equalizer 37 3.2.3.2 Costas loop 38 3.2.4 Demodulation 40 3.2.4.1 Descramble 40 3.2.4.2 Demapping 41 3.2.5 Decode 41 3.2.5.1 LDPC decode 41 3.2.5.2 BCH decoder 43 Chapter 4 Simulation and Implementation 47 4.1 Transmitter 47 4.2 Receiver 51 4.2.1 In PL Module 52 4.2.2 In PS Module 54 4.2.2.1 Time synchronization 54 4.2.2.2 Frequency synchronization 58 4.2.3 Data received 64 4.3 Satellite Link Simulation 68 4.3.1 Receiver capability 68 4.3.2 Antenna pointing loss 71 4.3.3 Link budget analysis 71 Chapter 5 Conclusion 74 5.1 Conclusion 74 5.2 Future work 75 References 77

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