本論文提出一個5.8GHz數位式自我注入鎖定(Digital Self-Injection-Locked, DSIL)低中頻都卜勒雷達，其中DSIL電路能透過比例積分(proportional-integral)控制器調整數位延遲單元(Digital Delay Line, DDL)來補償人體心肺運動造成的都卜勒相移，使注入訊號一直維持在最佳感測點條件，能解決零點問題，並提供雷達系統優越的靈敏度及線性度表現。
　　除了DSIL電路外，本雷達還包括一RF升降頻器及一低中頻電路板，其中後者在設計上整合收發端Hartley鏡像拒絕器及雜波(clutter)抵銷器，搭配雜波特徵化算法，透過實驗驗證可以有效消除環境雜波，並且鏡像拒絕比例(Image Rejection Ratio, IRR)高達81.24dB。在相同實驗條件及設置下，與數位低中頻都卜勒雷達相比較，在金屬板振動偵測靈敏度表現上，數位低中頻都卜勒雷達為40μm，而DSIL低中頻都卜勒雷達為20.7μm；在金屬板移動狀態下之振動偵測靈敏度，數位低中頻都卜勒雷達為300μm，而DSIL低中頻都卜勒雷達為100μm，透過實驗證實本論文使用之DSIL技術可以明顯優化靈敏度及線性度，並且應用於人體靜態及移動狀態之生理訊號量測，所得數據均與參考裝置量測值高度吻合。

　　This study proposes a 5.8 GHz low-IF Doppler radar using digital self-injection-locking (DSIL) technology to achieve high sensitivity and high linearity. In the DSIL circuit of this radar, a proportional-integral (PI) controller is used to adjust the delay of a digital delay line (DDL) to compensate for the Doppler phase shift caused by the human cardiopulmonary motion, so that the injection signal meets the optimum detection point condition and therefore can avoid the null detection point problem.
　　In addition to the DSIL circuit, the radar includes an RF up/down converter and a low-IF circuit board that was designed by integrating a Tx/Rx Hartley image rejector and a clutter canceller. With the algorithm of clutter characterization, the radar was verified through experiments to effectively eliminate the environmental clutter and achieve a high image rejection ratio (IRR) of 81.24 dB. Moreover, the measured sensitivities of the oscillation amplitude of a fixed and moving metal plate are 40 versus 20.7 μm and 300 versus 100 μm, respectively, between the conventional digital low-IF radar and the proposed DSIL low-IF radar under the same experimental setup conditions. The results of these and further experiments evidence that the use of DSIL technology can evidently improve the sensitivity and linearity of the low-IF radar and thus increase the applicability of the radar for vital-sign monitoring of a stationary or moving person. The comparison of the vital sign measurements between the proposed radar and the reference device shows strong agreement.

論文審定書 i
致謝 ii
摘要 iii
Abstract iv
目錄 v
圖次 vii
表次 x
第一章 緒論 1
1-1 研究背景與動機 1
1-2 低中頻都卜勒雷達簡介 2
1-3自我注入鎖定雷達簡介 5
1-4 章節規劃 7
第二章 數位低中頻都卜勒雷達系統研究 8
2-1 關鍵技術 8
2-1-1 Hartley鏡像拒絕器 8
2-1-2 雜波抵銷電路 16
2-1-3 雜波量測及抵銷 18
2-2 數位低中頻都卜勒雷達系統實驗 22
2-2-1 系統架構及實驗設置 22
2-2-2 雜波抵銷結果 27
2-2-3 靈敏度量測 28
2-2-4 線性度量測 29
2-3 結果與討論 33
第三章 基於數位自我注入鎖定技術之 低中頻都卜勒雷達系統研究 34
3-1 數位自我注入鎖定技術 34
3-2 使用DSIL技術之低中頻都卜勒雷達系統實驗 37
3-2-1系統架構及實驗設置 37
3-3-2雜波抵銷結果 42
3-3-3靈敏度量測 43
3-3-4線性度量測 45
3-3-5人體感測結果 46
3-3 結果與討論 50
第四章 結論與未來展望 51
參考文獻 52

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