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研究生:蘇翊碩
研究生(外文):Yi-Shou Su
論文名稱:利用訊號微分頻率解調器之自我注入鎖定生理都卜勒雷達
論文名稱(外文):Self-Injection-Locked Vital Sign Doppler Radar Using Signal Differentiation Frequency Demodulator
指導教授:洪子聖洪子聖引用關係
指導教授(外文):Tzyy-Sheng Horng
學位類別:碩士
校院名稱:國立中山大學
系所名稱:電機工程學系研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2018
畢業學年度:107
語文別:中文
論文頁數:64
中文關鍵詞:心肺感測器自我注入鎖定雷達連續波雷達波包檢測器注入鎖定微波微分器
外文關鍵詞:Cardiopulmonary sensorcontinuous wave radarmicrowave differentiatorenvelope detectorself-injection-locked radar
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本論文實現自我注入鎖定雷達來感測人體生理徵象,並且研究訊號微分頻率機制,而相較於以往的延遲線頻率解調機制,此解調架構具有低成本、電路複雜度低、體積較小等優點。本論文大致分為兩大部分,第一部分主要為頻率解調器的研製,第二部分敘述雷達感測原理,並以實驗證實其感測靈敏度,而能應用於生理感測。
當電磁波處發射至目標物時,經由目標物反射注入回壓控振盪器中,使振盪器處於自我注入鎖定狀態,使系統產生因目標物胸腔位移造成的頻率調制訊號,而可以透過微波微分器,將原先的頻率調制訊號轉換為振幅調制訊號,再經由波包檢測器檢測,即可得到呼吸及心跳訊號。
本論文亦會提出此頻率解調架構的限制,並以理論及實驗來驗證,且討論如何解決此問題,使得此頻率解調機制得以應用於生理感測。最後,本論文會提出此頻率解調機制的優點及缺點,並提出有效的改善方法。
In this thesis, self-injection locked (SIL) radar is utilized to detect vital sign, and the signal differentiated frequency demodulator is presented for use in the SIL radar. Compared with the delay line frequency demodulator, this frequency demodulator has low cost, low circuit complexity, and small size. This thesis is devided into two parts. First, this thesis will discuss how to design the frequency demodulator. Secondly, this thesis explains the sensing principle and the sensitivity of the radar system, which was comfirmed by the experiments and applied to cardiopulmonary monitoring.
When the electromagnetic wave is emitted to the subject, the reflected wave from the subject is received and injected into a voltage-controlled oscillator (VCO), so that, the oscillator is in self-injection locked, and outputs a frequency modulated signal due to chest movement of the subject. After passing through a microwave differentiator, the frequency modulated signal is converted into an amplitude modulated signal. In this way,the vital sign signal can be detected by a power detector.
This thesis also discusses the limitation of the signal differentiation frequency demodulator, and verifies it by the experiments applied to vital sign sensing. Finally, this thesis compares the advantages and disavantages of the frequency demodulators used in the SIL radar system.
論文審定書 i
論文公開授權書 ii
誌謝 iii
摘要 iv
Abstract v
目錄 vi
圖次 vii
表次 viii
第一章 序論 1
1.1 研究背景與動機 1
1.2 常見生理感測雷達 2
1.2.1 CW (continue wave)雷達 2
1.2.1 超寬頻雷達(Ultra Wide-Band Radar,UWB) 3
1.2.3 自我注入鎖定(Self-injection locked,SIL)雷達 5
1.3 章節規劃 6
第二章 訊號微分頻率解調器 7
2.1 微分器之設計 7
2.2 功率檢波器 13
2.3 運算放大器 18
第三章 自我注入鎖定生理都卜勒雷達 20
3.1 感測原理 20
3.1.1 延遲線解調原理 20
3.1.2 訊號微分頻率解調器原理 21
3.2 2.4 GHz單基式自我注入鎖定雷達測試 25
3.2.1 Delay line 解調機制 26
3.2.2 以訊號微分之解調機制 32
3.3 5.8 GHz單基式自我注入鎖定雷達測試 38
3.3.1 Delay line 解調機制 39
3.3.2 以訊號微分之解調機制 41
第四章 結論 47
參考文獻 48
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