高効率性と高耐障害性を具備する低軌道衛星通信システムの実現

项目来源

日本学术振兴会基金(JSPS)

项目主持人

塚本 和也

项目受资助机构

九州工業大学

立项年度

2023

立项时间

未公开

项目编号

23K18467

项目级别

国家级

研究期限

未知 / 未知

受资助金额

6240000.00日元

学科

情報科学、情報工学およびその関連分野

学科代码

未公开

基金类别

挑戦的研究(萌芽)

关键词

低軌道衛星通信システム ; 電離圏電波伝搬 ; 太陽活動 ; 輻輳制御アルゴリズム ;

参与者

藤本晶子

参与机构

未公开

项目标书摘要:Outline of Research at the Start:本研究では、高効率性と高耐障害性を具備する低軌道衛星通信システムの実現を目指し、以下の3つの課題に取り組む。まず、(1)電離圏時空間変動モデルとデータ同化技術を活用して電離圏揺らぎを推定する。更に(2)低軌道衛星通信システムに適した輻輳制御を比較・予測し、通信性能予測モデルを構築する。最後に、(3)予測した電離圏揺らぎに適切な輻輳制御アルゴリズムに適応的に切り替える手法を提案・実装し、長期間の実験を通じて季節変動への耐性も検証する。

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  • 1.Daily Variations of Inter-Hemispheric Field-Aligned Currents During Severe Geomagnetic Storms Using Equatorial Magnetic Field Measurements from Davao Station, Philippines

    • 关键词:
    • Magnetic field measurement;Magnetic fields;Magnetic materials;Solar energy;Storms;Equatorial magnetic field;Field aligned currents;Geomagnetic storm;Ground based;Ground-based magnetometer data;Inter-hemispheric field-aligned current;MAGDAS/CPMN;Magnetic-field;Solar cycle;Solar cycle 23 ;Solar cycle 24
    • Ranasinghe, Manjula;Fujimoto, Akiko;Yoshikawa, Akimasa;Jayaratne, Chandana
    • 《United Nations Germany Workshop on the International Space Weather Initiative: Preparing for the Solar Maximum, ISWI 2024》
    • 2026年
    • June 10, 2024 - June 14, 2024
    • Neustrelitz, Germany
    • 会议

    An examination of geomagnetic data collected in Davo, Philippines, over a 20-year period encompassing solar cycles 23 and 24 resulted in the identification of attributes linked to the Inter-Hemispheric Field-Aligned Currents (IHFACs). The study focused on the analysis of the normalized D component of geomagnetic field (ΔD). Specifically, characteristics were investigated in the dawn, noon, and dusk sectors, revealing the identification of both long-term features across solar cycle 23 and 24. During the declining phases of solar cycles, peak-to-peak amplitudes of ΔD in the dusk sector show enhancements, indicating increased sensitivity to geomagnetic variations as solar activity wanes. The variation of ΔD during storm periods was studied and compared to quiet time ΔD variations to identify the changes in IHFACs during high-intensity geomagnetic storms. During the main phase of severe geomagnetic storms, significant enhancements in the negative component of ΔD occur around local noon, while at night, the positive component of ΔD shows marked increases. During the recovery phase, the positive component's daily amplitude gradually decreases over several days, indicating a slow return to quieter geomagnetic conditions, whereas the negative component remains relatively stable compared to quiet periods. It is evident that the response of IHFACs to solar disturbances significantly depends on the phase of the geomagnetic storm and the time of day. © The Author(s) 2026.

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