支援飛鼠號立方衛星之S頻段地面站評估及整測｜國立中央大學博碩士論文系統

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研究生：	羅偉豪 Wei-Hao Luo
論文名稱：	支援飛鼠號立方衛星之S頻段地面站評估及整測
指導教授：	張起維 Loren Chang
口試委員:
學位類別：	碩士 Master
系所名稱：	地球科學學院 - 太空科學與工程學系 Department of Space Science and Engineering
論文出版年：	2020
畢業學年度：	108
語文別：	中文
論文頁數：	95
中文關鍵詞：	立方衛星、飛鼠號、地面站、軟體無線電
外文關鍵詞：	IDEASSat, S band, GNU Radio, Software Defined Radio
相關次數：	點閱：12 下載：0
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飛鼠號衛星(IDEASSat)是由國家太空中心資助由中央大學與國際合作研發的教學立方衛星計畫。立方衛星本身相較於一般衛星其尺寸要小得非常多也較不複雜，導致製造時間與消耗成本也會低得多，因此是一個非常適合以教育為目的或由學術組織開發的衛星架構。衛星由許多的次系統(Subsystem)所構成，一般來說，衛星的次系統被分為: 主酬載(Main Payload)、衛星電腦指令控制系統(Command and Data Handling Subsystem, C& DH)、通訊次系統(Communication Subsystem, COMM)、電力次系統(Electrical Power Subsystem, EPS)以及姿態控制次系統(Attitude Determination and Control Subsystem, ADCS)。通訊次系統是負責對地的資料傳送與接收從地面發射的指令，因此與地面站的通訊時間與資料的正確程度會是主要考量。
本論文將會集中於IDEASSat立方衛星的通訊次系統評估與設計，還有與其相對的通訊地面站的建置，希望總和這個計劃的經驗，以提供接下來的同仁做為學習及借鑒。

IDEASSat is a 3U CubeSat funded in part by the Taiwan National Space Organization and developed by National Central University in collaboration with international partners. The size and complexity of a CubeSat is much smaller than a typical satellite so that the manufacturing time and cost are much lower. These reasons make the CubeSat satellite architecture ideal for education purposes or for development in a university environment.. Like larger satellites, a CubeSat is made up of sub-systems including the Main Payload, Command and Data Handling Subsystem (C&DH), Communication Subsystem (COMM), Electrical Power Subsystem (EPS), and Attitude Determination and Control Subsystem (ADCS). Among those, COMM is responsible for transmitting data and receiving commands. Therefore, the amount of data that can be downlinked during access time between the satellite and the ground station, as well as the integrity of the data received will be the main considerations driving COMM subsystem design.
This thesis will introduce and discuss the assessment and design of the COMM subsystem of IDEASSat and the corresponding ground station. We conclude with the lessons learned through the development of this project for reference in the design of future missions.

摘要 .................... I
Abstract .................... II
致謝 .................... III
圖目錄 .................... VI
表目錄 .................... IX
一、緒論 .................... 1
1. 立方衛星 .................... 1
2. 衛星通訊頻段.................... 1
3. 調變 .................... 3
4. 射頻訊號與數位資料....................5
5. MinXSS任務通訊次系統簡介.................... 5
6. 飛鼠號衛星 (IDEASSat) .................... 7
7. 中央大學衛星地面站.................... 9
二、 IDEASSat S頻段通訊次系統.................... 11
1. STXC S頻段發射器.................... 11
2. SANTC S頻段貼片天線.................... 13
3. STXC通訊規格.................... 14
3.1. QPSK調變簡介.................... 14
3.2. 通訊編碼.................... 16
3.3. 差分編碼 .................... 18
三、 地面站評估....................19
1. 通訊時間模擬.................... 19
2. 鏈路預算.................... 21
V
2.1. 概念....................21
2.2. 天線增益 .................... 22
2.3. 訊噪比 .................... 23
2.4. 接收器靈敏度 .................... 23
3. IDEASSat鏈路預算 .................... 25
3.1. 系統通用參數 .................... 25
3.2. 資料傳輸需求 .................... 26
3.3. 雜訊評估 .................... 27
3.4. 傳輸損失 .................... 28
3.5. 發射端參數 .................... 31
3.6. 接收端參數 .................... 33
3.7. 鏈路分析 .................... 35
四、軟體地面站接收系統 .................... 37
1. 軟體無線電架構 軟體無線電架構 .................... 37
2. GNU Radio .................... 38
3. NCU GNU Radio S頻段接收系統 .................... 39
3.1. 訊號輸入 .................... 40
3.2. 訊號初級處理模塊 .................... 42
3.3. 時脈恢復 .................... 45
3.4. 多路徑效應均衡器 .................... 52
3.5. QPSK解調變 .................... 53
3.6. QPSK相位模糊 .................... 56
3.7. 資料解碼 .................... 57
五、功能測試 .................... 60
1. STXC傳輸測試設定 .................... 60
2. STXC同步模式測試 .................... 60
3. STXC 資料測試 .................... 63
4. 加入軟決定模塊 .................... 66
5. 測試結果 .................... 67
六、結論 .................... 75
1. 結論 .................... 75
2. 經驗學習與未來展望 .................... 76
參考文獻   
                                

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