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研究生:黃韻曄
研究生(外文):Yun-Yeh Huang
論文名稱:完全互補碼於超音波陣列訊號之應用
論文名稱(外文):The Application of Complete Complementary Code for Ultrasound Array Signals
指導教授:李穎李穎引用關係鐘嘉德鐘嘉德引用關係
學位類別:碩士
校院名稱:元智大學
系所名稱:通訊工程學系
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:2009
畢業學年度:97
語文別:中文
論文頁數:60
中文關鍵詞:完全互補碼超音波串音干擾
外文關鍵詞:complete complementary codeultrasoundcross talk
相關次數:
  • 被引用被引用:8
  • 點閱點閱:167
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  • 下載下載:2
  • 收藏至我的研究室書目清單書目收藏:0
格雷互補序列(Golay Complementary Sequence)與格雷互補集合(Golay Complementary Set of Sequences)被廣泛運用在超音波量測系統。格雷互補序列具有非週期自相關函數(Aperiodic Auto-correlation function)和為脈衝的特性,可以取代傳統短脈衝(short pulse)及相關函數近似脈衝的的其他二位元序列(例如:偽隨機序列),提升超音波訊號在接收端偵測的準確度。
本論文探討由完全互補碼使用於超音波線性陣列的效能。完全互補碼具有各格雷互補集合彼此互相關函數和於各位移項為全零的正交特性,使用於超音波線性陣列(linear array)系統,陣列單元的發射訊號間不會互相干擾。我們觀察到當每個超音波陣列單元使用In phase/Quadrature 同時傳送成對的格雷互補序列-one burst one pair時,比傳統one burst one sequence的發送方式準確度相同且仍然能維持其正交性,訊號總傳送時間(Total Transmission Duration)降低,盲域(Blind Zone)大幅減小,可以有效提升超音波陣列訊號的接收品質。
Golay Complementary Sequence(GCS) and Golay Complementary Sequence Sets(GCSS) have been widely used in ultrasound systems. Golay Complementary Sequences have the property that the sum of the Aperiodic Auto-Correlation Function (AACF) of pairing sequences is an impulse function, and they can replace short pulses or biphase pseudo random sequences to enhance the precision of ultrasound reception.
In this thesis, we explore the performance of Complete Complementary Code (CCC) in linear array ultrasound systems. A Complete Complementary Code contains several Golay Complementary Sequence Sets, each set contains multiple Golay Complementary Sequence Pairs. It has the property that the Golay Complementary Sequence Sets it contains are mutually orthogonal at all delay shifts, so there will be no interference when used in ultrasound arrays. We observe that when each transducer orthogonally transmit a Golay Complementary Pair simultaneously, the precision is the same as the existing method, where two Golay Sequences in a pair are transmitted one after the other. Our one burst one pair transmission method not only maintains orthogonality between signals from different transducers, but also reduces the total transmission duration and the site of the blind zone, effectively improves ultrasound array signal reception.
中文摘要i
英文摘要ii
誌謝iii
目錄iv
圖目錄vi
表目錄ix
符號表x
第一章 序論1
第二章 超音波檢測成像系統研究背景4
2.1 超音波檢測基本概念5
2.2 相關函數7
2.3 編碼波形傳輸技術與解析度8
2.4多感測器傳輸超音波訊號10
2.5 格雷互補對,格雷互補集,相互正交格雷互補集,完全互補碼12
2.6以正交格雷互補集合建構的發射訊號傳輸模型 26
第三章 電腦模擬成果29
3.1 電腦模擬中使用之完全互補碼29
3.2 基頻發射/接收訊號分析32
3.3 陣列單元間Cross-talk現象45
第四章 結論57
參考文獻58
[1]李佰祺教授 超音波原理 等
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