本研究使用GPS接收儀記錄船體運動響應，透過頻譜分析進行波浪測量。由於船體本身並非完全隨波，船體運動響應無法完全反應波浪能量，高頻部份的波浪能量會因為船體外殼影響而被濾除，因此在頻譜分析過程中需要加入RAO(Response Amplitude Operator)並保留適當頻寬的波浪頻譜才能求出合理之波浪頻譜。計算此波浪頻譜的波浪統計特性，並與現場資料浮標的波浪資訊進行比對以驗證本研究架構的可行性。

In this study, we use spectra analysis to estimate wave spectrum based on ship motion measurements from GPS receiver. Because of the non-perfect wave following characteristics, ship motion could not fully response wave energy, high frequency wave components are filtered due to the large inertia of the ship. For this reason we need to take account ship response amplitude operator, RAO and keep suitable frequency range in the wave spectrum estimation. We will examine the feasibility of this study by comparing the wave characteristics of the measured wave spectrum with data buoy information.

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