近年來微波雷達已被廣泛應用於生理偵測領域，其中連續波雷達是最常用的一種。為提升感測能力，自我注入鎖定雷達被開發出來，其具有較傳統連續波雷達更優越的靈敏度，因而能夠遠距離檢測因心肺活動引起的細微胸腔運動。然而，自我注入鎖定雷達仍然會受到檢測零點的影響，而且在具有雜波的狀況下，其頻率偏移會影響其感測範圍及靈敏度。為了解決上述問題，本文利用最佳相位追蹤自我注入鎖定雷達來解決檢測零點和頻率偏移的問題。
本論文研究最佳相位追蹤自我注入鎖定雷達，其結合自我注入鎖定雷達和鎖頻迴路兩種技術，以提高雷達感測效能和精確度。其結合方式是在自我注入鎖定雷達的解調端添加鎖頻迴路，使自我注入鎖定迴路的相位保持在180度，以保持在最佳檢測點。此外，本文也運用一個相移器消除雜波的影響，進而提升雷達系統的在不同環境下的感測能力。在進行公式推導和分析後，本文研究的最佳相位追蹤自我注入鎖定雷達系統通過實驗得到了驗證。在實驗中，運用最佳相位追蹤自我注入鎖定雷達穿過水泥牆來監測受試者的生理訊號，實驗結果顯示雷達系統能夠成功且精準偵測出水泥牆後3米內受試者的生命跡象。

In recent years, microwave radar has been widely used in the field of vital sign detection, with continuous wave radar being the most commonly used type. To enhance sensing capabilities, self-injection-locked radar has been developed, which offers superior sensitivity compared to traditional continuous wave radar, enabling long-range detection of subtle chest movements caused by cardiopulmonary activities. However, self-injection-locked radar is still affected by the detection null point, and in the presence of clutter, frequency offset can impact the sensing range and sensitivity of the radar system. To address these issues, this paper proposes the use of an optimal phase tracking self-injection-locked radar to overcome the problems of detection null point and frequency offset.
This paper also analyzes and measures the performance of the optimal phase tracking self-injection-locked radar, utilizing both self-injection-locked radar and frequency-locked loop techniques, to improve the sensing efficiency and accuracy of the radar. The combination involves adding a frequency-locked loop at the demodulation end of the self-injection-locked radar, ensuring the phase of the self-injection-locked loop remains at 180 degrees, thus maintaining optimal self-injection locking phase. Additionally, this study employ a phase shifter to eliminate the influence of clutter, thereby enhancing the sensing capability of the radar system in different environments. After formula derivation and analysis, the proposed optimal phase tracking self-injection-locked radar system is validated through experiments. In the experiments, the optimal phase tracking self-injection-locked radar is used to monitor the vital signs of a subject located 3 meters behind a concrete wall. The results demonstrate that the radar system can successfully and accurately detect the vital sign of the subject beyond the concrete wall.

論文審定書 i
誌謝 ii
摘要 iii
Abstract iv
圖次 vi
表次 ix
第一章 緒論 1
1-1 研究背景與動機 1
1-2 雷達技術演進 3
1-3 章節規劃 6
第二章 系統架構 8
2-1自我注入鎖定迴路及鎖頻迴路 8
2-2雷達系統工作原理及分析 16
2-3系統性能最佳化分析 19
2-4雜波抑制技術分析 25
2-5雷達系統設計 25
第三章 實驗設置與量測結果 30
3-1雜波抑制實驗 30
3-2最佳相位追蹤實驗 33
3-3感測靈敏度實驗 36
3-4人體生理感測實驗 39
3-5穿牆生命偵測實驗 42
第四章 結論及未來展望 47
參考資料 48

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