合成孔径雷达图像的近岸海面风场反演

摘要

根据海面微波散射原理，给出了星载合成孔径雷达(Synthetic ApertureRadar,SAR)图像海面风场反演的方法。该方法包括SAR图像辐射定标、海面风向确定和风速计算。利用该方法由加拿大RadarsatSAR图像反演获得了中国海南省东南部近岸海区海面风场，并与预报风场作了比较。结果显示，二者相符得很好，风速的均方根误差为0.94m/s，风向的均方根误差为4.03°。%This paper presents an approach to the retrieval of highresolution ocean surface wind fields from spaceborne synthetic aperture radar (SAR) imagery based on scattering theory of microwave for ocean surface. It consists of three procedures: radiometric calibration of SAR image, wind direction determination and wind speed calculation. As a case study, a Radarsat SAR image of the coastal zone near the Hainan Island, China is analyzed. The results are compared with those calculated from a numerical model. It is shown that they are in good agreement. The root－mean－square errors of wind speed and wind direction are 0.94m/s and 4.03° respectively.