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研究生:吳秉勳
研究生(外文):Ping-Hsun Wu
論文名稱:測距系統之分析
論文名稱(外文):Analysis of Range Detection System
指導教授:江簡富江簡富引用關係
指導教授(外文):Jean-Fu Kiang
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:電信工程學研究所
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:2005
畢業學年度:93
語文別:英文
論文頁數:55
中文關鍵詞:雷達數位訊號處理射頻微波電子
外文關鍵詞:RadarDSPRFMicrowaveElectronics
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本論文中設計分析一測距系統,此系統應用操作在2.45 GHz 頻段,包含低雜訊放大器、本地震盪器、混波器及數位信號處理電路。 射頻電路使用先進之高電子移動率電晶體來降低雜訊,回波信號以高速類比數位轉換器經過特殊設計之演算法萃取,並經Matlab 模擬驗證。
In this thesis, a range detection system using frequency-modulated continuous-wave radar is designed at 2.45 GHz. The system consists of low-noise amplifier, local oscillator, mixer and DSP processor. Advanced high-electron-mobility transistors (HEMT) are used in RF
circuit to reduce noise. Specific algorithms are chosen to analyze the echoed signal. Three systems with DSP are proposed to reduce the complexity of the conventional systems. They are simulated with Matlab, and the results matches well with theoretical prediction.
Contents
Abstract
Table of Contents ii
List of Figures v
1 Range Detection Radar 1
1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Pulse Radar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Frequency-Modulated Continuous-Wave Radar . . . . . . . . . . . . . . . . 3
1.4 Recent Development on FMCW Radar . . . . . . . . . . . . . . . . . . . . 9
2 Proposed FMCW System 18
2.1 Digital IF Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.2 Digital Mixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.3 Parameters of Proposed System . . . . . . . . . . . . . . . . . . . . . . . . 21
3 RF Circuit Design 24
3.1 Low-Noise Ampli er . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.2 Local Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
i
3.3 Mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.4 Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.5 Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4 Spectral Analysis 31
4.1 Windowing Techiniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.2 Periodogram Estimator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5 Results and Discussions 39
5.1 FMCW System with DSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.2 FMCW System with Digital IF Waveform . . . . . . . . . . . . . . . . . . 42
5.3 Two-stage Heterodyne FMCW Radar with Digital Mixing . . . . . . . . . . 43
6 Conclusions 49
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