基于TerraSAR-X图像的北部湾海浪要素提取方法研究

Research of the Wave Parameters Extraction Method in Beibu Gulf by TerraSAR-X Images

【目的】研究如何从TerraSAR-X图像中获取实时、准确的海浪信息。【方法】基于海面风场反演的地球物理模型和海浪的参数化初猜谱反演模式来获取海浪要素信息,并使用HH极化方式在北部湾海域成像的TerraSAR-X进行实例验证,再把反演结果与WaveWatchⅢ模式运算结果进行对比。【结果】有效波高的绝对误差为0.8m,平均周期的绝对误差为1.9s。【结论】本文的方法能有效的从TerraSAR-X中提取海浪要素的信息。

The wave is one of the important marine dynamic environment parame-ters.Up to now,TerraSAR-X is the X-band synthetic aperture radar sensor that the only way to obtain the high resolution image.Researching how to get real-time and accurate wave infor-mation from TerraSAR-X image,and use it to monitor Beibu Gulf information has important significance.[Methods]This thesis gets the information of ocean wave based on the Geophysical Model Function(GMF)for sea surface wind field and the wave parameterized early speculate spectrum retrieval model,uses HH-polarization model verifying the TerraSAR-X image in Bei-bu Gulf with practical examples, and compares the retrieval results with the operation results obtained from Wave Watch Ⅲ model.[Results]The absolute error of significant wave height is 0.8m,and the absolute error of average period is 1.9s.[Conclusion]This method can effectively extract the wave parameters from TerraSAR-X images.