用圆中数滤波器排除卫星散射计风场反演中的风向模糊

由卫星散射计测量得到的归一化雷达截面积σ^0值以及这些σ^0值关联海面风速风向的经验模型函数可以反演海面的风矢量。但是对应一分辨面元上测量的σ^0值并不是唯一的风矢量解与之对应，选择一个风矢量解来表示真风矢量的处理过程就叫模糊排除或称消去伪解。本文引入一种圆中数滤波技术，在由模拟的ERS－1散射计数数据反演风场中，不附加任何其他信息的情况下，圆中数滤波器改进风向模糊排除方法,很好地重现模拟的海面真风矢量。

Resolving directional ambiguities for scatterometer derived winds by a circular median filter algorithm

Scatterometer derived winds are inherently ambiguous. Several possible wind vectors are computed for each retrieval cell. Only one wind vector corresponds to the true solutio while the others are aliases. This paper proposes an ambiguity removal algorithm,the circu- lar median filter approach,to select the true solution. The algorithm was tested on a simulat- ed ERS-1 data set. The test results demonstrate the validity of circular median filter ambigu- ity removal algotithm.