臺灣博碩士論文加值系統

本論文第一部分提出一透地雷達研究，將6個寬頻的韋瓦第天線組成陣列，在近場範圍內進行目標物的偵測及成像。利用單元天線的頻率掃描反射訊號轉成時域訊號後，藉由時間軸平移的方式，將個別天線的回波訊號在近場範圍重組，可達到聚焦效果，獲得較明顯的目標物反射。透過網格資料庫和成像演算法，可在不同位置及環境介質裡進行目標物的成像。
第二部分提出以洛德曼陣列天線實現的訊號源定向系統。定向源演算法藉由洛德曼透鏡同時接收到的多個波束埠訊號，以振幅比較法來估測訊號源方向。本研究採用13個波束埠對6個天線埠的平面式洛德曼透鏡可實作於印刷電路板上，並放置於無反射實驗室進行輻射場型的驗證。此外亦放置於戶外空間進行訊號源定向量測實驗，以實測的訊號數據驗證定向演算法的效能。實驗結果顯示定向源系統具有精確的定向功能，其估測訊號源的角度誤差可達1度以內。

In the first part of this thesis, the proposed ground penetrating radar, which is consist of six broadband Vivaldi antennas, provides detection of target and the target's image in the near-field range. Reflection coefficient spectrum of each element antenna are used to derive the time domain reflection profile. The proposed beam focusing algorithm, which is based on a time-shift method, can enhance the target's reflection. By combining focused results at different locations, the radar system can produce the image that reveals the target location.
In the second part, an implementation of direction-of-arrival estimation algorithm using Rotman lens array antenna is proposed. The algorithm is based on a magnitude comparison method. The Rotman lens array provides multiple beam toward different directions simultaneously. The planar Rotman lens designed consists of 6 antenna ports and 13 beam ports. The prototype was fabricated with a printed circuit board. Array patterns is verified in a spherical near-field chamber, while the DoA algorithm was implemented offline using data taken from an open site. According to the experiment result, the estimation error of developed DoA system is less than 1 degree.

摘要
Abstract
誌謝
目錄
圖目錄
表目錄
第一章 緒論
1.1研究背景與動機
1.2 章節概述
第二章 使用近場波束聚焦陣列天線的透地雷達研究
2.1 前言
2.2 單元天線及陣列天線設計
2.3 訊號處理方法
2.4 近場波束聚焦演算法開發
2.5 系統資料庫建置及平面成像演算法
2.6 透地雷達成像效能驗證
2.6.1各式透地雷達目標物之模擬結果
2.6.2實作之透地雷達模型
2.7 小結
第三章 洛德曼透鏡陣列天線實現之訊號源定向系統
3.1 前言
3.2 洛德曼透鏡設計
3.2.1 2-6 GHz洛德曼透鏡模擬及量測結果(使用FR4板材)
3.2.2 2-6 GHz之洛德曼透鏡設計及量測(使用RO板材)
3.2.3 6-18 GHz之洛德曼透鏡設計及量測
3.3洛德曼透鏡陣列天線系統量測
3.4洛德曼陣列天線系統戶外量測系統設置與實測
3.5訊號源定向演算法開發與效能驗證
3.6小結
第四章 結論
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