利用衛星SAR影像資料推算海洋波浪之方向頻譜

Directional Wave Spectrum Measured by SAR Imagery Data

郭一羽(Yi-Yu Kuo) ； 高義郎(Yi-Lang Kao) ； 呂黎光(Li-Guang Leu)

《航測及遙測學刊》 2卷2期 (1997/06) Pp. 37-64

https://doi.org/10.6574/JPRS.1997.2(2).3

摘要

本文主旨在說明如何利用ERS-1（歐洲遙測衛星一號）衛星SAR（合成孔徑雷達）影像資料，來推測海洋風浪的方向頻譜。由於傳統的觀測方式對量測海洋風浪的方向頻譜有諸多的困難與不便，本文試圖以遙測技術的方法，對如何利用衛星 SAR影像資料求得方向頻譜的方法提出說明，更進一步以波譜分析的觀點對各種可能提高解析度的分析技巧加以探討，將分析計算結果與海面實測數據做比對驗證。從實例的比對中可以証實利用衛星SAR資料推測海洋風浪方向頻譜的可行性。

關鍵字

合成口徑雷達 ； 風浪 ； 方向頻譜

並列摘要

ERS-1 SAR images were used to evaluate the directional wave spectra. The remote sensing techeniq is applied and asists the traditional measuring method to get better directional spectra easily. Two-dimensional F. F. T (Fast Fourier Transform) algorithm was applied to caculate two dimensional wave spectrum. To improve the resolution of directional wave spectra is the most impressing work in this study. The estimated SAR spectra were compared with those measured by wave-rider. From the comparison of SAR and in-situ spectra, the feasibility of estimating ocean wave directional spectrum from SAR images was confirmed in this study.

並列關鍵字

SAR ； wind waves ； directional spectrum