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博碩士論文 etd-1018113-120507 詳細資訊
Title page for etd-1018113-120507
論文名稱
Title
利用表面聲源與Biot Theory於深海海域反算海底底質地音參數之研究
The Inversion for Sediment Acoustic Parameters Using Surface Sound Source with Biot Theory in Deep Sea Area.
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
107
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2013-11-11
繳交日期
Date of Submission
2013-11-19
關鍵字
Keywords
底質損失、聲納偵測效能、底質參數、海底反彈
bottom bounce, bottom loss, NTURAY, Biot Theory, sonar detection performance, sediment acoustic parameter
統計
Statistics
本論文已被瀏覽 5716 次,被下載 2387
The thesis/dissertation has been browsed 5716 times, has been downloaded 2387 times.
中文摘要
由於臺灣位處亞熱帶地區,海水聲速較高,因此在臺灣周邊海域實施反潛偵搜作為的水面艦艇,其反潛聲納能量的傳遞將很難避免與海底底質接觸,因此除了影響聲波反彈路徑的海底地形之外,影響聲波反彈能量的海底底質聲學性質,也是左右聲納偵測效能(sonar detection performance)的一項重要因子。預估聲納效能需要聲速(Sound Speed)、有效密度(Effective Density)及吸收(Attenuation)等聲學性質,而這些聲學性質的預估與取得,則是本研究的主要目的。本文提出以雙載台海上音傳實驗場景為基礎,藉NTURAY處理深海大角度一次海底反彈的聲納回波,計算相關聲線路徑弧長、海底入射角等幾何性質,並估計底質損失,再利用Biot Theory探討某入射角下的底質損失,反推欲求之底質聲學參數。藉由本研究方法可估算海底反彈點的底質聲學參數供聲納偵測效能預估之用,另外對雙艦艇音傳實驗資料的運用,亦可產生效益最大化的效果。
Abstract
Due to locating in subtropical zone with high-speed sea water sound velocity, Taiwan Navy fleet’s sonar energy can not avoid to contact with sea bottom for ASW purpose. Seabed topography affects the reflection of sound rays, and sediment acoustic parameters affect reflected energy as well. To predict sonar performance, sediment acoustic parameters, such as sound speed, effective density and attenuation, are necessaries. Estimating these parameters is the main purpose of this thesis. Base on two-ship acoustic experiment, use NTURAY to calculate sound rays geometry properties, such as ray path arc length and incident angle, and estimate bottom loss in deep ocean one-bottom-bounce scenario. Then inverse sediment acoustic parameters from incident angle and bottom loss via Biot Theory. This method can estimate sediment acoustic parameters of bottom bounce spot for sonar performance prediction, and maximize data applications of two-boat sound transmission experiment.
目次 Table of Contents
論文審定書 i
謝 誌 iii
摘 要 iv
Abstract v
目錄 vi
圖次 viii
表次 xii
第一章 緒論 1
1.1 研究背景與動機 1
1.2 文獻回顧 3
1.3 研究目標 4
1.4 貢獻 5
第二章 研究步驟與理論方法 6
2.1 理論基礎 7
2.2 NTURAY 9
2.3 海水的吸收(Absorption) 10
2.4 反射係數(Reflection Coefficient)與底質損失(Bottom Loss) 11
2.5 Biot Theory 14
2.6 小結 25
第三章 底質參數反算 27
3.1 理論驗證 27
3.2 量測實驗 36
3.3 反算過程 38
3.3.1 A測線第一趟 38
3.3.2 A測線第二趟 41
3.3.3 A測線第三趟 45
3.3.4 B測線第一趟 49
3.3.5 B測線第二趟 53
3.3.6 C測線第一趟 57
3.3.7 C測線第二趟 61
3.3.8 C測線第三趟 65
3.4 反算結果 69
3.4.1 測線A 69
3.4.2 測線B 70
3.4.3 測線C 70
第四章 反算誤差分析 72
4.1 誤差原因探討 72
4.2 誤差分析 72
4.2.1 水文變動對NTURAY幾何計算之影響探討 72
4.2.2 水文變動對Biot Theory反算之影響探討 78
4.3 小結 81
第五章 結論 82
參考文獻 90
參考文獻 References
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