一种相干系数加权的最优干涉相位滤波

给出了一种利用相干系数加权的最优干涉相位滤波方法．证明了滤波后最小噪声方差意义下的最优权值为相位噪声方差的倒数，给出了通过相干系数估计获取最优权值的方法．在相干系数估计中，首先利用外部数字高程模型反演并补偿场景目标点到主辅雷达斜距差引起的干涉条纹；然后根据最小平均相位差准则，利用一组方向性加权窗口自适应选取估计样本，通过仿真实验给出了方向窗参数的合理选择．实验结果表明，这种方法能够更加有效地抑制相位噪声和滤除相位残点．

Coherence-weighted optimum interferometric phase filtering method

A coherence-weighted optimum interferometric phase filtering method is presented. It is proved that the optimum weight is the variance reciprocal of the phase noise in the sense of minimum post-filter phase noise variance, and the approach to obtaining the optimum weight through coherence estimation is exhibited. Moreover, in estimating the coherence, the synthetic interferogram of the scene which is proportional to the range difference between targets and radars is computed and compensated with reference DEM firstly, then a group of directional windows is utilized to select the samples adaptively according to the Minimum-Mean-Phase-Difference rule, and simulation experiment has established the reasonable choice of the directional windows' parameters. Finally, the processing results of the real data show that our method can suppress the phase noise and reduce the number of residues dramatically.