博碩士論文 90623009 詳細資訊


姓名 郭致輝(Chih-Hui Kuo)  查詢紙本館藏   畢業系所 太空科學研究所
論文名稱 中華衛星一號Ka波段傳播實驗診斷分析
(The diagnosis and analysis of the Ka Band Propagation Experiments on ROCSAT-1)
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摘要(中) 自1999年1月中華衛星一號發射升空至今已有4年的時間,而2000年開始利用RGT與TGT地面站接收資料至今也累積了超過3年的觀測資料,因此本論文針對衛星訊號鎖定狀態、微波輻射儀所量測之天空溫度及降雨量等進行長期的統計分析,結果發現3年來RGT的鎖定狀態約為69%,TGT則為62%,造成鎖定狀態不夠理想的主要原因除了大氣對訊號所造成的衰減之外,還有系統長期維護不易使得系統不穩定所造成。
雖然降雨對訊號接收有很大的影響,但是在總觀測時間中降雨所佔的時間比率非常的低,所以降雨對整體鎖定狀態的表現影響不大,若是將各個降雨的pass資料加以分析,則可以發現地面降雨對訊號造成嚴重的衰減。而我們也發現RGT與TGT的radiometer有漂移的問題,使得在利用其觀測值來做訊號衰減之預測時可能會有所誤差,且在降雨事件過後附著於天線盤面及獨立式微波輻射儀防水罩上之水膜亦會影響觀測資料。
摘要(英) The diagnosis and analysis of the Ka Band Propagation Experiments on ROCSAT-1.Since January ,1999,ROCSAT-1 launched successfully,we have observed from ROCSAT at two ground stations for more than 3 years.This paper presented some statistic results of RGT and TGT.From 2000 ~ 2003,the lock on percentage of RGT is about 69%,and the lock on percentage of TGT is about 62%.
關鍵字(中) ★ 華衛一號
★ 中華衛星一號
★ 衛星通訊
★ 電波通訊
關鍵字(英) ★ ROCSAT
★ Ka Band
論文目次 目錄
摘要…………………………………………………………………….Ⅰ
圖表目錄……………………………………………………………….Ⅳ
第一章 前言……………………………………………………………1
第二章 理論基礎
2-1 Ka波段電磁波傳播特性……………………………………...4
2-1-1 大氣氣體的吸收所造成的衰減………………………...4
2-1-2 降水粒子所造成的衰減………………………………...7
2-1-3 雲層吸收所造成的衰減………………………………...8
2-1-4 偏極化的損失…………………………………………...8
2-1-5 對流層閃爍效應………………………………………...9
2-2 大氣輻射儀之輻射傳遞理論………………………………...10
2-3 自由空間衰減………………………………………………...16
第三章 相關實驗儀器說明
3-1 中華衛星一號簡介…………………………………………...19
3-2 固定式與移動式地面接收站………………………………...22
3-2-1 RGT與TGT地面系統簡介…………………………...22
3-2-2 RGT與TGT之建構…………………………………...24
3-2-3 觀測資料之取得……………………………………….25
3-2-4 RGT與TGT輻射儀的校正……………………………25
3-3 地面大氣微波輻射儀………………………………………...26
3-3-1 微波輻射儀的簡介…………………………………….26
3-3-2 輻射儀的校正方法…………………………………….28
3-4 光學雨量計…………………………………………………...28
第四章 實驗觀測結果與分析
4-1 RGT radiometer校正與19.5GHz radiometer的協同觀測….30
4-1-1 RGT radiometer校正前後時間序列圖………………...30
4-1-2 RGT radiometer與19.5GHz radiometer之比對………32
4-1-3 stand alone radiometer防水罩及RGT天線盤面水膜問題探討……………………………………………………..32
4-2 RGT與TGT三年來觀測結果統計分析…………………….35
4-2-1 RGT累積觀測時間與lock on比率…………………...35
4-2-2 TGT累積觀測時間與lock on比率……………………39
4-2-3 RGT及TGT重要元件故障說明………………………41
4-3 衛星訊號lock on 比率與降雨率之比較……………………43
4-4 衛星訊號與天空溫度的關係………………………………...44
4-5 RGT天線追蹤衛星的方位角與仰角………………………..47
4-6 TGT 2003年5月屏東實驗資料分析……………………….48
第五章 結論與展望
5-1 結論………………………………………………………...…50
5-2 展望…………………………………………………………...54
參考文獻………………………………………………………………..56
圖表………………………………………………………………59 ~ 100
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指導教授 朱延祥(Yen-Hsyang Chu) 審核日期 2003-6-19

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