碩士 / 國立臺灣海洋大學 / 河海工程學系 / 94 / 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.
| Identifer | oai:union.ndltd.org:TW/094NTOU5192037 |
| Date | January 2006 |
| Creators | Tai-Huang Chan, 陳泰宏 |
| Contributors | C. R. Chou, J. Z. Yim, 周宗仁, 尹彰 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 77 |
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