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低軌道のキューブサットからの原子時計ベースのUHF基準信号の時間差検出
https://doi.org/10.18997/00008900
https://doi.org/10.18997/00008900b9e85082-d20d-4b47-9539-bcccf9d84540
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
kou_k_545.pdf (4.4 MB)
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| アイテムタイプ | 学位論文 = Thesis or Dissertation(1) | |||||||
|---|---|---|---|---|---|---|---|---|
| 公開日 | 2022-06-09 | |||||||
| 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 | Time Difference Detection of Atomic Clock-Based UHF Reference Signal from a CubeSat in Low Earth Orbit | |||||||
| 言語 | en | |||||||
| タイトル | ||||||||
| タイトル | 低軌道のキューブサットからの原子時計ベースのUHF基準信号の時間差検出 | |||||||
| 言語 | ja | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 著者 |
Rahmi Rahmatillah
× Rahmi Rahmatillah
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| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | Communication between the on-orbit satellite and ground station （GS） is highly affected by several factors, which result mainly on the delay and error. Satellite signal delay and error are especially depending on the amount of ionosphere Total Electron Content （TEC） in the signal path. While the information of the TEC is currently available, the measurement of TEC has been mostly done using Global Navigation Satellite System （GNSS） signal and in some regions, the ionosonde data is also used. However, GNSSs are orbiting at altitude more than 20,000 Km, and its main purpose is serving as the navigation. Signals from a satellite orbiting in lower altitude with lower frequencies than GNSS may provide more precise measurement of TEC. Space Precision Atomic Clock Timing Utility Mission （SPATIUM） is a project to do three-dimensional ionosphere mapping by a satellite constellation in LEO measuring TEC with the Ultra High Frequency （UHF） radio signals. The first technology demonstration satellite called SPATIUM-I, a 2U CubeSat, was deployed from International Space Station in October 2018. The satellite emits 467MHz reference signal generated by a chip scale atomic clock. The signal is spread spectrum modulated with 250 chips in 4 msec. This thesis will present the development of the method to detect time difference between two consecutive signals received from the on-orbit SPATIUM-I satellite. The time difference will then be processed to derive the TEC difference between two locations. The time delay measurement will be done using commercially available Software Defined Radio （SDR） on ground station. However, the clock precision become the major challenge in the process, which leads to high error for the measurement. One of the methods to improve the clock is to inject the Global Positioning System （GPS） clock into the system. The key to this research is to be able to detect the beginning of the recovered spread spectrum chips using its I/Q data. For this purpose, signal processing using Matlab is done. | |||||||
| 目次 | ||||||||
| 内容記述タイプ | TableOfContents | |||||||
| 内容記述 | 1 Introduction||2 Literature Review||3 Spatium-I Satellite Development||4 Time Difference Measurement||5 Spatium-I Signal Reception and Calculation for TEC Difference||6 Research Conclusion and Future Works | |||||||
| 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545号 学位授与年月日: 令和4年3月25日 | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | CubeSat | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Ionosphere | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | TEC | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | SPATIUM | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Time Difference | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | SDR | |||||||
| アドバイザー | ||||||||
| 趙, 孟佑 | ||||||||
| 学位授与番号 | ||||||||
| 学位授与番号 | 甲第545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 | 2022-03-25 | |||||||
| 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 | 10.18997/00008900 | |||||||
| ID登録タイプ | JaLC | |||||||
