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姓名 徐千雅(Chien-ya Hsu) 查詢紙本館藏 畢業系所 太空科學研究所 論文名稱 高頻無線電波電離層回波強度估計
(The ionospheric high-frequency radio echo intensity estimation)相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 高頻無線電波藉由電離層進行遠距通訊時，電波的能量會受介質影響並隨路徑增加而逐漸衰減，此衰減的多寡將直接影響高頻通訊的品質與通達率。故了解傳播前後電波的強度變化與其所需之最低發射功率，對高頻通訊是極為重要的。因此本論文運用無線電波強度預估方程式結合自由空間傳播損耗、設備增益校正與IONCAP模式中電離層損耗的計算來預估電波強度的變化，並將預估結果與中壢動態式電離層探測儀(Dynasonde)的實際量測值進行比對。
經由比較預估值與量測值的差異，發現此預估方程式在日間會低估，而低估的程度會隨著時間逐漸變小直至15:30後變為高估。另外，藉由數據統計得知中壢Dynasonde垂直探測的傳播損耗約為90-120 dB，則考量回波可以與背景噪音辨別的門檻值以及中壢的背景噪音，故推論本系統需提供50 dBW以上的垂直傳播有效電波強度將可確保電波的傳遞。
摘要(英) High-frequency (HF) radio propagation through the ionosphere offers long-distance communication. Theoretically, radio intensity is decreased with increasing path and is affected also in different media. Therefore, it is important to estimate wave-propagation loss for HF communication. We have applied wave intensity equation which combines basic free-space path loss, equipment gain and the ionosphere loss quoted from IONCAP model. Then we compared the estimations with the measurements from the ChungLi dynasonde.
From the comparisons, the results show that the estimations are less than the measurements in daytime but larger after 15:30 local time. Meanwhile, the results show a propagation loss around 90 to 120 dB in vertical sounding above ChungLi. Considering local background noises and distinguishing threshold from system, the ChungLi dynasonde system has to provide more than 50 dBW efficient radio power that radio waves can be successfully measured.
關鍵字(中) ★ 電離層
★ 動態式電離層探測儀
★ 電波強度估計關鍵字(英) ★ radio intensity estimation
★ dynasonde
★ ionosphere論文目次 中文摘要...................................................................................................I
Abstract....................................................................................................II
誌謝…….................................................................................................III
目錄…….................................................................................................IV
圖目錄……..............................................................................................VI
表目錄…….............................................................................................VII
第一章 序論.........................................................................................1
1.1 研究動機......................................................................................1
1.2 內容組織大綱..............................................................................2
1.3 電離層簡介..................................................................................3
1.3.1 D層.............................................................................................4
1.3.2 E層.............................................................................................5
1.3.3 F層..............................................................................................5
1.4 電離層觀測..................................................................................8
1.4.1 電離層無線電波傳播....................................................................8
1.4.2 電離層反射................................................................................10
第二章 雷達系統與資料................................................................15
2.1 動態式電離層探測儀................................................................15
2.1.1 動態式電離層探測儀發展簡介.....................................................15
2.1.2 中壢動態式電離層探測儀設置.....................................................16
2.2 資料處理與結果........................................................................21
2.2.1 回波資訊分析.............................................................................21
2.2.2 電離圖.......................................................................................31
第三章 訊號傳播損耗計算...........................................................34
3.1 無線電波強度預估方程式........................................................34
3.2 自由空間傳播損耗....................................................................36
3.3 電離層損耗................................................................................38
3.3.1 電離層吸收原理.........................................................................38
3.3.2 斜向傳播電離層損耗方程式........................................................40
3.3.3 E層校正方程式..........................................................................43
3.3.4 峰值偏向吸收方程式..................................................................44
3.3.5 Es層損耗方程式.........................................................................46
3.4 預估方程式使用........................................................................47
第四章 資料分析結果與討論.......................................................49
4.1 Dynasonde量測結果..................................................................49
4.2 電離層回波強度預估................................................................50
4.2.1 天線增益....................................................................................51
4.2.2 回波強度預估值與量測值比較.....................................................54
4.3 有效傳播能量與背景值............................................................56
第五章 結論與未來展望................................................................60
參考文獻................................................................................................62
附錄一....................................................................................................64
附錄二....................................................................................................73
附錄三....................................................................................................90
附錄四....................................................................................................91
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指導教授 蔡龍治(Lung-chih Tsai) 審核日期 2011-7-22 推文 plurk
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