海洋蘊藏豐富資源，隨著人類對海洋資源的需求與日俱增，對海洋環境的暸解與掌握也日益重要。以現場量測的方式探索與瞭解海洋環境特徵為最直接的方法之一。近年來，隨著科學技術持續精進發展，海洋遙感探測技術已漸趨成熟。本研究目的是探討X-band雷達技術應用於潮位觀測的可行性以及適用條件。本研究先針對波譜法應用於同一觀測期間的不同的單張影像進行水深值分析，結果呈跳動的不穩定現象。此現象在利用漢寧窗函數後已獲得改善，並且透過模擬影像驗證了二維譜轉換為一可行之分析方法，但仍有改善空間。故考慮加入雷達影像資料的時間域資訊，進一步討論應用三維譜轉換求取雷達影像時序列中水深資訊的可行性。三維譜轉換分析的水深時序列結果與鄰近潮位站比較，在潮時結果有吻合現象，但潮差則有偏大之現象。本文檢討分析理論後確認影像尺寸大小以及影像張數為決定潮位計算的關鍵之一。針對七股海域較常發生的波浪週期條件，在不考慮波浪非定常性之影響下，影像大小須在128*128pixels以上，且連續影像之張數須達256張以上可得較佳的解析結果。

With the growing demand of ocean resources, it is more and more important to explore our ocean environment. It is straightforward to apply in-situ measurement to investigate and realize the environmental characteristics in the ocean. In recent years, the remote sensing technology is becoming mature. This thesis analyses the feasibility and the applicable conditions for the X-band radar images applying to tidal height measurement. In the beginning, this study focuses on wave spectrum method to analyses water depth information with various single-images at the same observation time, while the results are unstable. However, this unstable result can be improved to apply Hanning window function. For the further research we still need to take spatio-temporal information into account move forward to discuss about 3D FFT to extract the water depth information from the sea surface radar image sequences. The results match the real tidal times; but are larger than the tidal heights. This study proved that the image resolution and the length of image sequence are the key factors for the tidal height calculation. As for the wave period in Chigu sea area, without the influence of nonstationary, the result would be more accurate under the condition that the image resolution is higher than 128*128 and the amount of continuous images exceeds 256 image sequences.

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