To enhance the interferogram filtering effect in Interferometric Synthetic Aperture Radar (InSAR), an improved Goldstein filter is proposed, which improves the filter block size, smoothing operator, and filtering parameters. In addition, the filter window size can be adjusted adaptively according to the noise standard deviation. Meanwhile, the new smoothing operator is designed to achieve maximized noise suppression while ensuring resolution. Finally, new filtering parameter is constructed by considering the effects of interferogram amplitude and noise standard deviation. To evaluate the effectiveness and practicality of the proposed algorithm, simulated and real data are used for verification, respectively. The results show that the proposed algorithm significantly reduces the interferometric phase noise, enhances the filtering effect, and has obvious advantages in maintaining phase continuity.
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