Improving the Retrieval of Empirical Green's Function Using Adaptive Covariance Filter and Weighted Stacking. - Weishuai Chang; Guangzhou Shao; Hua Wu; Keyu Huo; Zhe Wang; Ruofan Zhao; Xinsongrong Liu; Haoxuan Zhu (IEEE Trans. Geosci. Remote. Sens., 2025)