L波段合成孔径雷达影像反演涌浪参数

发布时间：2018-01-07 16:04

本文关键词：L波段合成孔径雷达影像反演涌浪参数　出处：《遥感信息》2016年03期 　论文类型：期刊论文

【摘要】：针对L波段合成孔径雷达图像尚无波浪反演算法的问题,提出了利用高级陆地观测卫星(ALOS)搭载的相控阵列L波段合成孔径雷达(PALSAR)在日本近海的图像发展的算法,反演得到了涌浪参数(包括波长和波向)。研究假设L波段SAR对涌浪的成像机制为线性的,通过图像处理得到了高质量的PALSAR图像谱,从此谱可计算得到谱峰值波长和波传播方向。此图像谱所固有的180°方向模糊,可利用涌浪只向近岸传播的特点解决。通过对反演和日本"全国港湾海洋波浪情报网"(NOWPHAS)现场观测的波参数的比较,波长的偏差是-10.5m,均方差是18.3m,相关系数是0.94;波向的偏差是-1.3°,均方差是15.5°,相关系数是0.94。上述数据表明,反演方法中将L波段PALSAR对涌浪的成像机制假设为线性是可行的。
[Abstract]:There is no wave inversion algorithm for L-band synthetic Aperture Radar (SAR) images. An algorithm for image development of phased-array L-band synthetic aperture radar (PALSAR) carried by Advanced Terrestrial observing Satellite (ALOS) in offshore Japan is presented. The inrush parameters (including wavelength and wave direction) are obtained by inversion. It is assumed that the imaging mechanism of L-band SAR is linear, and the high quality PALSAR image spectrum is obtained by image processing. From this spectrum, the peak wavelength and the direction of wave propagation can be calculated. The 180 掳direction of the image spectrum is blurred. It can be solved by using the characteristic that surges propagate only to the inshore. The comparison of the wave parameters observed in the inversion and in situ observation by Japan's "National Harbour and Ocean Wave Information Network" is carried out. The wavelength deviation was -10.5 m, the mean deviation was 18.3 m, and the correlation coefficient was 0.94; The deviation of wave direction is -1.3 掳, the mean deviation is 15.5 掳, and the correlation coefficient is 0.94. In the inversion method, it is feasible to assume that the imaging mechanism of L-band PALSAR is linear.
【作者单位】：上海海洋大学国际海洋研究中心;国家海洋局东海预报中心;国家海洋局第一海洋研究所;日本东北大学;
【基金】：教育部留学基金项目(D-8005-14-0036) 国家海洋局海洋溢油鉴别与损害评估技术重点实验室开放基金项目(D-8005-14-8003)
【分类号】：P715.7
【正文快照】： 0引言合成孔径雷达(SAR)已被证明是高分辨率观测海洋表面波的有效遥感工具[1-2]。SAR图像包含大量表面波信息,我们可利用这些信息反演表面波参数[3-7]。SAR对表面波的成像机制基于两尺度模型[8-9],即大尺度的表面波调制小尺度的Bragg波。迄今为止人们共提出了三种调制机制(即

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