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研究生: 黎逸偉
Li, Yi Wei
論文名稱: 淺層反射探勘數據之最佳視窗適性濾波處理
Adaptive filtering with optimum window on shallow reflection data processing
指導教授: 鄭懌
Jeng, Yih
學位類別: 博士
Doctor
系所名稱: 地球科學系
Department of Earth Sciences
論文出版年: 2012
畢業學年度: 100
語文別: 中文
論文頁數: 65
中文關鍵詞: 適應性濾波二維中值濾波二維適應性維那濾波反射探勘數據最佳濾波視窗
論文種類: 學術論文
相關次數: 點閱:104下載:7
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  • 適應性濾波(adaptive filtering)在壓抑二維數位圖像(2D digital image)資料中的隨機雜信(random noise)上是一種很有效的信號處理方式。近年來,有許多的適應性濾波處理技巧被用來濾除地球物理探勘數據中所遭遇的隨機雜波,本研究使用並改良了其中兩種適應性濾波器─二維中值濾波器(2D median filter)以及二維適應性維那濾波器(2D adaptive Wiener filter),來處理淺層地球物理反射探勘數據。
    為使適應性濾波器能得到最佳濾波結果,本研究提出了一套創新的最佳濾波視窗設計法,以能隨信號主頻率而改變的可調濾波視窗設計,大幅提高二維中值濾波器以及二維適應性維那濾波器的濾波效能。
    一組模擬的雜信環境共炸點集聚(common-shot gather)以及一組模擬的雜信環境地下異常物反射剖面(profile)分別被用來測試兩種適應性濾波器的濾波效果,並將適應性濾波器的濾波結果與傳統有限脈衝響應(finite impulse response, FIR)帶通濾波器(band pass filter)的濾波結果做比較與討論。
    經模擬的模型信號處理證實最佳視窗二維中值濾波器以及最佳視窗二維適應性維那濾波器可有效濾除隨機雜信後,本研究分別用此兩種最佳視窗適應性濾波器處理兩組實際野外資料,其中一組為南投竹山槽溝震波測勘資料,另一組為宜蘭清水透地雷達(ground penetrating radar, GPR)測勘資料。
    兩筆野外資料的濾波結果均可看出在實際野外測勘資料的處理中,濾波器也都能成功的壓抑隨機雜波,提高信噪比(signal to noise ratio, S/N ratio),且二維中值濾波器在強化信號上更為優異,而二維適應性維那濾波器則可更成功的重建原始信號。

    摘 要 I Abstract III 目 錄 IV 圖 目 VI 表 目 XI 第一章 緒論 1 1.1 研究動機 1 1.2 文獻探討 4 1.2.1 反射探勘法 4 1.2.2 中值濾波器 4 1.2.3 維納濾波器 5 1.3 研究概念流程 6 第二章 研究方法 8 2.1 反射測勘原理 8 2.1.1 反射數據地表探勘方式 8 2.1.2 反射數據之解析能力 12 2.2 二維適應性濾波法 14 2.2.1 二維中值濾波器 14 2.2.2 二維適應性維納濾波器 16 2.3 最佳濾波視窗設定 21 第三章 模擬試驗 23 3.1 水平地層反射模型建立 23 3.2 地下異常物反射信號模擬 34 第四章 野外反射數據分析與討論 44 4.1 南投竹山槽溝震波測勘案例 44 4.1.1 野外測勘參數 44 4.1.2 數據分析與討論 46 4.2 宜蘭清水透地雷達測勘案例 53 4.2.1野外測勘參數 53 4.2.2數據分析與討論 55 第五章 結論 61 參考文獻 63

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