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全极化微波辐射计是一种可以测量海面辐射全部4个Stokes参数的新型被动遥感仪器,是测量海面风场、尤其是海面风向的新手段。介绍了国际首台全极化微波辐射计WindSat的海面风向信号谐波特征,在分析风向反演180°模糊度现象的成因基础之上,提出了利用WindSat能够进行前—后向双视扫描的优势去除风向反演180°模糊度问题的思路;通过构建海面风场仿真场景,在WindSat模拟亮温数据中加入高斯白噪声后,使用最大似然估计法和中值滤波技术开展了海面风向反演。比较和分析了使用WindSat前向刈幅和WindSat前—后向刈幅观测数据的风向反演结果。结果表明:由于能够有效去除风向反演180°模糊度,使用前—后向刈幅观测数据的风向反演精度要明显优于仅仅使用前向刈幅的反演结果。
An all-polarimetric microwave radiometer is a new type of passive remote sensing instrument that can measure all four Stokes parameters of the sea surface radiation and is a new measure to measure the sea surface wind field, especially the sea surface wind direction. Based on the analysis of the causes of the inversion of the 180 ° ambiguity by wind direction, the paper presents the use of WindSat to scan the front-back dual vision Advantages to remove the 180 ° ambiguity wind direction of the train of thought; through the construction of sea surface wind simulation scene, the WindSat simulated brightness temperature data to add Gaussian white noise, the use of maximum likelihood estimation and median filtering technology to carry out the wind direction play. Wind direction inversion results using WindSat forward and backward-swath observations were compared and analyzed. The results show that the accuracy of the wind direction inversion using the forward-backward swath data is obviously better than that of using only the forward swath due to the effective removal of wind direction inversion of 180 ° ambiguity.