WEKO3
アイテム
小型衛星のためのソフトウェア無線を用いた適応型パケット通信システム
https://doi.org/10.18997/00008632
https://doi.org/10.18997/00008632d1d3ae7a-de29-4adb-bf3a-b0dbd8a2349e
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
kou_k_534.pdf (4.7 MB)
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| アイテムタイプ | 学位論文 = Thesis or Dissertation(1) | |||||||
|---|---|---|---|---|---|---|---|---|
| 公開日 | 2021-12-06 | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||
| 資源タイプ | doctoral thesis | |||||||
| タイトル | ||||||||
| タイトル | Adaptable Packet Communication System for Small Satellites Using Software Defined Radio | |||||||
| 言語 | en | |||||||
| タイトル | ||||||||
| タイトル | 小型衛星のためのソフトウェア無線を用いた適応型パケット通信システム | |||||||
| 言語 | ja | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 著者 |
Abbas, Yasir Mohamed Osman
× Abbas, Yasir Mohamed Osman
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| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | This dissertation comprehensively explains the outcomes of small satellites communication system research. The research is held in Kyutech’s Embedded System Laboratory under supervision of Prof. ASAMI Kenichi. The research and the dissertation focus in studying a design to use software-defined radio （SDR） devices in small satellites to implement an adaptable communication system that changes the transmission data rate during satellites communication windows. Small satellite computation capabilities and power efficiency are evolving rapidly. Nowadays they are producing massive amounts of data to a level that challenges the communication capacity of these little advanced satellites. This advancing technologies in satellites need to deliver more information. For this reason, one of the main challenges of small satellites in low Earth orbits （LEO） is the utilization of such limited communication window with limited bandwidth and power consumption communication systems. As a practical solution, the research presents the adaptable data rate approach to get the maximum use of the available communication link within the available technology, by altering the data rate to fit the current situation of the channel. The easy way to step up in this direction is to use SDRs. SDR devices give an important feature, which is the ability to change the signal characteristics only by software. This research contributes to improving SDR-based systems by designing an adaptable packet communication transmitter and receiver that can utilize the communication window of CubeSats and small satellites. Adaptable systems advantage comes from the fact that near to Acquisition of Signal （AOS） and Loss of Signal （LOS）, the link budget margin is so small, while the margin increases when the line-of-sight elevation angle is closer to 90 degrees. The link budget is not fixed during the communication window. So, to get the maximum benefit, this research studies how to increase the data rate in the part where the link budget is more reliable. The design is carried out in simulation software called GNU Radio Companion （GRC）. The transmitters and receivers are built there. The implementation is performed using a Raspberry Pi and a LimeSDR mini device as the space board, for the ground station, a PC with another LimeSDR mini is used. The channel attenuation is simulated by adding noise to the transmitted signal. Following the feedback from receivers, the transmitter modifies the characteristics of the signal following one of pre-set modes. Theoretically, the system can adopt many modes, but for simplicity and to prove the concept, the modes are limited to three data rates of the Gaussian minimum shift keying （GMSK） modulation scheme, i.e., 2400 bps GMSK, 4800 bps GMSK and 9600 bps GMSK, which are the most popular in amateur small satellites. The system program was developed using GNU Radio software and Python scripts. In GNU Radio, the design was simulated and its behavior in simulated conditions observed. Transmitter packetizes the data into AX.25 packets and transmits them in patches. Between these patches, it sends signaling packets. The patch size is preselected. On the other side, the receiver extracts the data and saves it in a dedicated file. It directly replies with a feedback message whenever it gets the signaling packets. Based on the content of the feedback message, the data rate of the transmitted signal of the next patch of data is altered. To test the system, the packet rate and the actual useful data rate are measured and compared with the theoretical data rate. The packet success rate vs Signal-to-Noise Ratio （SNR） of the system at each data rate is also measured by simulating channel noise. Noise simulation is controlled by the SNR value. | |||||||
| 目次 | ||||||||
| 内容記述タイプ | TableOfContents | |||||||
| 内容記述 | 1: Introduction||2: Background and Literature Review||3: Telecommunication and gnu radio||4: Design||5: Implementation||6: Tests Measurements and Results||7: Discussion and Conclusion | |||||||
| 備考 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 九州工業大学博士学位論文 学位記番号：工博甲第534号 学位授与年月日：令和3年9月24日 | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Software Defined Radio | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Adaptable Packet Communication | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Small Satellites | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | GNU Radio | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Switchable Modulation | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Changeable Data Rate | |||||||
| アドバイザー | ||||||||
| 浅海, 賢一 | ||||||||
| 学位授与番号 | ||||||||
| 学位授与番号 | 甲第534号 | |||||||
| 学位名 | ||||||||
| 学位名 | 博士（工学） | |||||||
| 学位授与年月日 | ||||||||
| 学位授与年月日 | 2021-09-24 | |||||||
| 学位授与機関 | ||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||
| 学位授与機関識別子 | 17104 | |||||||
| 学位授与機関名 | 九州工業大学 | |||||||
| 学位授与年度 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 令和3年度 | |||||||
| 出版タイプ | ||||||||
| 出版タイプ | VoR | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
| アクセス権 | ||||||||
| アクセス権 | open access | |||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||
| ID登録 | ||||||||
| ID登録 | 10.18997/00008632 | |||||||
| ID登録タイプ | JaLC | |||||||
