隨著立方衛星（CubeSat）技術快速發展，衛星任務對於資料傳輸能力與通訊可靠度之需求日益提升，相較於傳統UHF頻段，S頻段具有較高之頻寬與資料傳輸速率，因此逐漸成為低軌道立方衛星重要之通訊方式之一。本研究以國立中央大學太空酬載實驗室執行之PEARL-1A/1B（Propagation Experiment using kurz-Above-band Radio in Low Earth Orbit）珍珠號立方衛星任務為研究對象，針對其S頻段地面收發站系統進行建置與驗證。研究內容包含PEARL-1A/1B衛星S-band通訊系統介紹、通訊鏈路分析、地面站設備架構說明、系統組裝流程及設備功能測試。首先透過Link Budget方法評估衛星與地面站之間的通訊鏈路可行性，分析不同仰角條件下之自由空間路徑損耗、接收功率及鏈路裕度；接著完成S-band地面站之組裝與系統整合，包含3公尺網狀拋物面天線、饋源系統、方位角與仰角追蹤系統、軟體定義無線電（Software Defined Radio， SDR）及數位地面站系統（Digital Ground Station， DGS）等設備建置；最後透過SDR設備功能測試、S-band Transceiver整合測試及衛星指令驗證測試，確認地面站具備衛星追蹤、指令傳輸與資料接收等能力。本研究成功建立PEARL-1A/1B任務所需之S頻段地面收發站系統，並完成相關設備之整合與驗證，可作為未來立方衛星地面站建置及S頻段衛星通訊技術發展之參考。;With the rapid development of CubeSat technology， the demand for higher data transmission capability and communication reliability in satellite missions has continued to increase. Compared with the traditional UHF band， the S-band offers wider bandwidth and higher data rates， making it one of the primary communication solutions for low earth orbit (LEO) CubeSat missions. This study focuses on the PEARL-1A/1B (Propagation Experiment using kurz-Above-band Radio in Low Earth Orbit) CubeSat mission developed by the Space Payload Laboratory of National Central University and presents the development and verification of its S-band ground transceiver station. The research includes an introduction to the PEARL-1A/1B S-band communication subsystem， communication link analysis， ground station architecture， system assembly procedures， and equipment performance testing. A link budget analysis was first conducted to evaluate the feasibility of the communication link between the satellite and the ground station by analyzing free-space path loss， received power， and link margin under different elevation angles. Subsequently， the S-band ground station was assembled and integrated， including a 3-meter mesh parabolic dish antenna， feed system， azimuth and elevation tracking system， Software Defined Radio (SDR)， and Digital Ground Station (DGS) system. Finally， SDR functionality tests， S-band transceiver integration tests， and satellite command verification tests were performed to validate the capabilities of satellite tracking， command transmission， and data reception. The results demonstrate the successful establishment and verification of the S-band ground transceiver station for the PEARL-1A/1B mission. The experience and outcomes of this study can serve as a valuable reference for future CubeSat ground station development and S-band satellite communication applications.
