受Faraday旋转影响的极化SAR数据的校准

合成孔径雷达的极化校准的根本目的是校正各个极化通道的极化不纯度和通道间的不平衡量，而对于星载系统，还要考虑受到Faraday旋转引入的极化矢量偏移的影响。文章首先利用电磁数值计算的方法获得点目标的极化散射矩阵，利用Kroneker积的性质得到极化校准模型，从而得到极化校准矩阵。由于不需要得到各个通道具体的失真特性，以及Faraday旋转的具体大小，因此该方法更容易实现。最后利用计算机仿真，验证了该方法的有效性。

Calibration of Polarimetric SAR Data Subject to Faraday Rotation

The object of the synthetic aperture radar system polarimetric calibration is to calibrate the polarization impurity terms and channel imbalance, and the Faraday Rotation should be considered for spaceborne system. In this paper, the polarization matrix is calculated using electromagnetic numerical algorithm, and the polarimetric calibration matrix is given using the Kronecker product. This method is easier to apply than regular method for the impurity and imbalance of every channel and Faraday rotation need not be calculated. The computer simulation is used to verify the validity of this method.