基于加权相关信号子空间的多频相位融合方法

摘要

In order to solve the problem of interferometric phase fusion for multi-frequence In SAR system under different frequency bands,a new phase fusion method based on weighted coherent signal subspace method (CSSM)was proposed in this paper.In the method,the joint pixel model was formulated;focusing matrix for CSSM was employed and improved;covariance matrices of different frequency bins were weighted firstly before which was transformed into a general covariance matrix at focusing frequency to improve the performance under different frequency bands signal-noise-ratio;after that,the interferometric phase was estimated by using sub-space proj ecting method.Simulated data and SIR-C real data processing results showed that the method could improve the performance of interferometric phase fusion effectively.%针对多频干涉合成孔径雷达(InSAR)干涉信号不同频率分量的相位融合问题，提出基于加权相关信号子空间方法(CSSM)的多频相位融合方法。该融合方法采用联合像素模型构建信号模型；对 CSSM构造聚焦矩阵的思想进行改进，通过对各频率分量对应的协方差矩阵进行加权聚焦应对不同频率分量的信噪比差异；并采用联合子空间投影方法估计干涉相位。仿真数据和 SIR-C雷达实际数据验证表明，该方法能够有效改善多频 InSAR的干涉相位估计性能。