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研究生:陳泰宏
研究生(外文):Tai-Huang Chan
論文名稱:應用船用雷達影像分析波場特性
論文名稱(外文):Analysis of directional wave fields using x-band navigation radar image sequences
指導教授:周宗仁周宗仁引用關係尹彰
指導教授(外文):C. R. ChouJ. Z. Yim
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:河海工程學系
學門:工程學門
學類:河海工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:77
中文關鍵詞:雷達遙測
外文關鍵詞:radarRemote of sensing
相關次數:
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為了能瞭解廣大的海域有許多學者開始發展遙測來觀測波浪。遙測的優點是可以一次測得較大面積的波面變化,而且儀器也不易受損。譬如說使用雷達來遙測波浪,可選擇設置於環境條件較為穩定之岸上,或是設置於船上觀測,較單點測波儀器更具優勢。本研究是以雷達遙測做為研究的主軸,觀測台北港海域海流變化。

研究內容包含了兩部分。第一部分是建立分析模式及驗證。該模式是以「波數-頻率譜」做為分析的主軸。為了確認分析方式的可行性及程式撰寫的正確性,利用模擬波浪進行計算分析,結果顯示與所輸入的條件相符,證明該分析模式是正確的。第二部分是實際雷達影像的處理與分析。使用先前驗證完成的計算模式分析雷達影像,求得主波向及示性波高並與現地的觀測樁資料進行比對。雷達影像主波向的辨識結果與現地觀測樁資料比對之下吻合;而示性波高計算的部分所得結果最大的誤差達到12%。
As an alternative, many researchers have applied remote sensing techniques to measure and record the sea surface. They have the advantages that information of a relative large area can be acquired instantly. Methods for the analyses of X-band navigation radar image sequences in Taipei Harbour have been studied and reported here in this thesis. Using radars is better direct measuring; one can measure and determine sea state parameters either from a far distance using satellites, or on board of a ship, as well as on land.

This paper is divided into two parts. In the first half we describe the briefly the methodology used. Random surface fluctuations were first simulated on a 2D plane using model spectra. 2D wavenumber- and wavenumber-frequency spectra are then obtained through Fast Fourier Transform (FFT). From these, 1D frequency spectrum, as well as parameters such significant wave height, and direction of propagation can be obtained. It is demonstrated that the present method can yield satisfactory results as compared with input data. In the second part, we analyzed some radar image sequences available. Both our estimated wave heights and wave directions are comparable with the ground truth. The result of the direction of propagation is satisfactory. The averaged deviations from ground truth are in the range of 12% for wave heights, which are believed to be acceptable. However, it must be admitted that, there are still have a lot of unresolved problems.
中文摘要Ⅰ
英文摘要Ⅱ
目錄Ⅲ
表目錄Ⅲ
圖目錄Ⅵ
符號說明III
第一章 前言..............................................1
1.1 波浪觀測.............................................1
1.2 海浪譜的估計.........................................2
1.3 研究目的與方法.......................................5
1.4 本文組織架構概述.....................................5
第二章 理論基礎..........................................6
2.1 分析模式建立流程.....................................6
2.1.1海洋波場之描述......................................8
2.2 波場影像數位化......................................10
2.3分析模式的主軸『波數–頻率譜』.......................11
2.3.1『波數–頻率譜』的物理意義.........................12
2.3.2『波數-頻率譜』與其他形式譜之關係..................13
2.4 模式中主波向及示性波高的計算........................17
2.4.1主波向.............................................17
2.4.2示性波高...........................................18
2.5分析模式建立流程.....................................19
第三章 計算模式的驗證...................................21
3.1 驗證方法與步驟......................................21
3.2 第一階段驗證........................................21
3.3 第二階段驗證........................................24
3.4 第三階段驗證........................................27
3.5 第四階段驗證........................................29
第四章 實際雷達影像分析結果.............................31
4.1 觀測地點與儀器......................................31
4.1.1 觀測地點..........................................31
4.1.2 觀測儀器..........................................32
4.2 雷達影像處理流程....................................34
4.3 灰階化..............................................35
4.4 影像濾波............................................37
4.5分析模式計算結果.....................................38
4.5.1示性波高...........................................38
4.5.2主波向.............................................43
第五章 結論與建議.......................................48
5.1 結論................................................48
5.2 建議................................................48
參考文獻................................................50
附錄 A 雷達影像示性波高的求法...........................53
附錄B 各月未乘迴歸參數前的示性波高與潮波儀資料逐時比對圖55
附錄C 各月分析所得的示性灰階值乘以常數100後與潮流儀資料比對圖......................................................60
附錄D 各月示性波高與潮波儀資料逐時比對圖................65
附錄E 雷達影像分析主波向結果玫瑰圖......................70
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