本論文使用自我注入鎖定技術應用於雷達系統，提出外差式自我注入鎖定雷達。較於傳統雷達系統，能有效改善靈敏度、降低雜波與周遭環境之干擾、以及降低成本。由於操作頻率會大幅影響系統的靈敏度，如果直接降低SILO的中心頻率將降低雷達系統的性能，因此本論文之雷達的發射頻率通過外插式架構從920 MHz降低到30 MHz，保持利用高頻SILO的靈敏度來提高系統的訊雜比，接收訊號也會從30 MHz升頻至920 MHz。避免注入訊號與原始振盪頻率差距過大而引起的不穩定現象。
本論文的雷達系統架構在頻率規劃方面具有顯著的優勢，因為可以使主要射頻元件的操作頻率落在常見的商用頻段，有現成產品可供使用加速開發時間。使用直接數位合成器進行頻率調變，能有效排除非線性掃描可能造成的幽靈目標，同時也可以自由地更改掃描頻寬，使系統更具彈性。所提出的雷達系統先對元件與子系統進行初步驗證，最後通過測試CW模式和FMCW模式，驗證該雷達系統能得到正確的都普勒資訊和測距的功能。

This thesis presents the application of self-injection locking technology in radar system by proposing a heterodyne self-injection-locked radar (HSILR). Compared to traditional radar systems, HSILR offers improved sensitivity, reduced clutter and environmental interference, and lower costs. The sensitivity of the radar system is significantly affected by the self-injection-locked oscillator (SILO)'s operating frequency. Directly lowering the center frequency of SILO would result in a decrease in radar system performance. Therefore, this thesis employs a frequency converter to lower the transmission frequency from 920 MHz to 30 MHz, allowing the utilization of high-frequency SILO's sensitivity to enhance the system's signal-to-noise ratio (SNR). The received signal is also up-converted to avoid instability caused by a large difference between the injection signal and the original oscillation frequency.
The radar system architecture presented in this thesis posesses significant advantages in terms of frequency planning. It enables the operation of main RF components in commonly used commercial frequency bands, which facilitates the use of off-the-shelf products to accelerate development time. The use of a Direct Digital Synthesizer for frequency modulation effectively eliminates the possibility of ghost targets caused by nonlinear scanning and allows for flexible adjustments of the scanning bandwidth. The proposed radar system underwent initial validation of its components and sub-systems, and finally, it was tested in both Continuous Wave (CW) and Frequency Modulated Continuous Wave (FMCW) modes to verify its capabilities in obtaining accurate Doppler information and range measurement.

論文審定書 i
誌謝 ii
摘要 iii
Abstract iv
目錄 v
圖次 vii
表次 x
第一章 序論 1
1.1 研究背景和動機 1
1.2 雷達系統介紹 2
1.2.1 連續波雷達系統 2
1.2.2 脈衝式超寬頻雷達系統 3
1.2.3 頻率調變續波雷達系統 4
1.2.4 高頻雷達系統 6
1.3 章節規劃 8
第二章 使用自我注入鎖定技術之雷達系統 9
2.1 自我注入鎖定技術應用於雷達系統 9
2.1.1 靈敏度與抗雜波表現 9
2.1.2 自我注入鎖定雷達原理 10
2.2 外差式自我注入鎖定雷達系統規劃。 12
2.3 即時性距離都普勒分析 16
2.4 外差式自我注入鎖定雷達元件參數 18
2.4.1 低壓差線性穩壓器介紹 21
2.4.2 儀表放大器介紹 23
第三章 外差式自我注入鎖定雷達系統量測 25
3.1 系統元件測試 25
3.1.1 自我注入鎖定震盪器 25
3.1.2 直接數位合成器 29
3.2 子系統測試 33
3.2.1 FCU開迴路系統測試 34
3.2.2 FCU閉迴路系統測試 36
3.2.3 非同步頻率解調器測試 38
3.3 連續波模式測試 42
3.4 頻率調變連續波模式測試 44
第四章 結論與未來展望 50
參考文獻 51

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