臺灣博碩士論文加值系統

超音波訊號被廣泛的運用在許多地方，本論文主要是使用超音波訊號來測量距離與辨識物體，在系統的架構之中，利用了一顆低成本與低耗電的微控制器-MSP430來作為運算核心，我們的目標是希望用較低的成本來建構一個可供測量距離與辨識物體的系統。
量測距離的實作中，因為訊號特性的緣故，我們運用了兩種不同的方法來作接收訊號的處理，分別是反射接收訊號起始點與反射接收訊號中心點，經由實作結果發現，在使用了反射接收訊號中心點的方法來做測距之後，會有較好的性能表現。
在辨識物體的實作中，我們經由量測物體特性資料庫的建立，將接收的訊號進行比對來達到物體辨識的功能，目前資料庫建立的物品主要針對表面粗糙度的不同，辨識的距離限制在40公分到50公分。
（關鍵詞：超音波、測距、辨識物體）

The ultrasonic extensive application of signal is in a lot of places, this thesis mainly uses the ultrasonic signal to measure the distance and target recognition, in the structure of the system, have utilized a low cost and low power consumptive microcontroller - MSP430 as the operation core, our goal is constructing a system that is suitable for measuring the distance and target recognition with lower cost.
The system of measuring distance is implementation, because of characteristic of the signal, we have used two kinds of different methods to process the received signal. The methods are the starting point of the received signal and the central point of the received signal. After system implementation is done, we find the method - starting point of the received signal have better performance.
The system of target recognition is implementation. To establish the database of object characteristic we can achieve the goal of target recognition via compare the database. The database is established by different rough surface of target. The target recognition is limited between 40 cm and 50 cm at present.
(Keyword: Ultrasonic, measure distance, target recognition)

中文摘要
英文摘要
誌謝
章節目錄
圖表目錄
第一章 簡介
1.1 研究動機與目的
1.2 章節描述
第二章 數位訊號處理的方法
2.1調變與解調
2.1.1高斯頻率移鍵序（GFSK）調變解調簡介
2.1.2脈衝寬調變（PWM）簡介
2.2取樣定理
2.3自相關函數運算
2.4數位訊號處理模擬範例
第三章 超音波感測系統實作
3.1 MSP430微控制單元簡介
3.2系統架構
3.2.1測距系統外部電路
3.2.2測距系統電路修正
3.2.3辨物系統外部電路
3.3測試超音波訊號基本性能
第四章 超音波量測距離
4.1反射回波起始點測距
4.1.1使用40KHz載波的PWM訊號測距
4.1.2使用MSP430內部Timer模組測距
4.2反射回波中心點測距
4.3回波訊號觸發電路-使用史密特觸發器
4.4問題與討論
第五章 超音波辨識物體
5.1辨識物體分類
5.2超音波回波訊號之系統模型
5.3分析與建立辨識物體量測資料
5.4結論
第六章 論文結果與討論
附錄
參考文獻

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