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姓名	黃咨翰(Tzu-Hang Huang)  查詢紙本館藏	畢業系所	電機工程學系
論文名稱	雷達接收機多頻帶疊合之時域重建方法 (Signal reconstruction method using multi-band overlapping of wide-band receiver)
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摘要(中)	超寬頻雷達相較一般傳統連續波雷達其發射波型為極短的高斯脈衝波，相對頻寬占了20%以上，其優點是因其超寬頻和高分辨力的特性，可獲得目標物的細微動量的時域表現，因此窄頻雷達的技術很難使用在超寬頻雷達。在接收機部分因其波形為極窄波形(ns量級)的瞬時信號，要完整保留回波的精細響應，取樣的問題是一大挑戰，若要取得不失真的波形，在類比數位轉換器上的限制就需要高達數十GHz的取樣率，成本和製造的困難，導致很難實現。本研究用於頻率取樣重建方法，利用傅立葉轉換式，使用混頻器及振盪器等射頻元件滿足積分式，將工作頻帶劃分多個通道，而ADC取樣率的限制速率降低到子頻寬的頻寬範圍，取樣為頻率係數，後端數位處理結合多組低速ADC輸出的值進行綜合得到輸出波型。最後本研究使用商用規格微波元件實作寬頻雷達的接收機雛形，並將原需要的ADC取樣速率降至十倍以上。
摘要(英)	The utra-wideband radar transmitting gaussian pulse is different from traditional radar. The bandwidth with respect to the center frequency of the utra-wideband radar is above 20 percent. The utra-wideband radar has advantage in ultra-wideband and high resolution which can get the fine momentum of measuring target in time-domain. However, significant implementation challenges arise as well due to the large bandwidths. The analog-to-digital converters in the receiver must arrive GHz sample rates in order to completely capture the UWB signal whose pulse’s width is nanoseconds, so the cost of radar is very high and it is hard to realize. This paper uses the frequency domain approach to address the problem. This method is using mixer, oscillator and integrator to implement the Fourier transform. In the proposed architecture, multiple channels separating the spectrum of input signal are parallel to one another. Then, the ADC samples the bandwidth of sub channels. Combining these frequency components and inverse Fourier transform can obtain the completely time-domain waveform. Finally this paper not only uses commercial RF components to implement the prototype of broadband radar receiver but also reduces the restriction in ADC sample rate about ten times.
關鍵字(中)	★ 超寬頻雷達 ★ 頻率取樣 ★ 類比數位轉換器 ★ 傅立葉轉換	關鍵字(英)
論文目次	摘要 i Abstract ii 誌謝 iii 目錄 iv 圖目錄 vii 表目錄 x 第一章 緒論 1 1-1研究動機 1 1-2文獻探討 2 1-3論文架構 3 第二章 超寬頻雷達 5 2-1 超寬頻定義 5 2-2 UWB系統模組 8 2-2-1 發射訊號(Transmitted Signal) 8 2-2-2 目標模型(Target Model) 9 2-2-3通道模型(Channel Model) 10 2-2-4 接收訊號(Received Signal) 11 第三章 微波電路設計基礎 12 3-1集總電路和分布常數元件 12 3-2 橫向電磁波傳輸線理論 14 3-3 微帶傳輸線 17 3-3-1微帶線 17 3-3-2微帶線設計 17 3-4 混頻器 20 3-4-1雙平衡混頻器 20 3-4-2混頻器的特性參數 22 第四章 頻域取樣於多頻帶疊合時域重建方法 26 4-1頻率取樣動機 26 4-2信號分析在頻域部分 26 4-3頻率取樣 28 4-4積分形式頻率取樣 29 4-5反傅立葉訊號重建 31 第五章 雷達系統硬體設計架構 36 5-1系統架構 36 5-2收發模組電路設計 38 第六章 實驗與討論 48 6-1寬頻雷達發射機 48 6-2寬頻雷達接收機matlab模擬 53 6-3寬頻雷達頻域取樣接收機 60 第七章 結論與未來展望 64 7.1結論 64 7.2展望與未來 64 參考文獻 66
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指導教授	徐國鎧(Kuo-Kai Shyu)	審核日期	2016-7-28
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