提出一种基于联合子空间投影技术的新方法来进行干涉合成孔径雷达相位滤波。所提方法采用的联合观测矢量的优点是,在任意配准误差“(不超过1个像素)的情况下,观测矢量所对应的协方差矩阵的噪声子空间维数都和精确配准时的噪声子空间维数相同。所提方法在采用联舍噪声空间投影方法的同时,充分利用观测矢量中相邻分辨单元的相干信息,因此在降低相位噪声的同时,还具有自动配准合成孔径雷达图像的功能,进而实现相应像素间干涉相位的准确估计。实测数据及仿真数据的处理结果验证了所提方法的有效性。
An improved joint subspace projection method is proposed for synthetic aperture radar interfero- merry (InSAR) phase estimation. Benefiting from the new formulation of joint data vector, the noise subspace dimension of the corresponding covariance matrix with the coregistration errorμ(0〈μ〈1) pixel is the same as that of the covariance matrix with accurate coregistration. The joint subspace projection technique is used, which enable it to have the function of automatic registration synthetic aperture radar image and to reduce the phase noise simultaneously. Meanwhile data processing of measured data and simulation results verify the effec- tiveness of the method.