Decorrelated GRACE time-variable gravity solutions by GFZ, and their validation using a hydrological model

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Filling the Data Gaps Within GRACE Missions Using Singular Spectrum Analysis (2021, methodology): “The result is smoothed by the DDK3 filter (Kusche et al., 2009).”
Optimizing estimates of annual variations and trends in geocenter motion and J2 from a combination of GRACE data and geophysical models (2016, methodology): “The optimal strategy found in that study consisted of using GRACE monthly solutions complete to spherical harmonic degree 60 and filtered by means of the DDK4 filter [Kusche et al., 2009], in combination with a buffer width of 150 km, and accounting for SAL effects.”
ITSG‐Grace2018: Overview and Evaluation of a New GRACE‐Only Gravity Field Time Series (2019, background): “This simple filter is chosen deliberately, because our goal is to investigate the noise content of the GRACE solutions and not to maximize geophysical signals, for which a DDK-type filter (Kusche et al., 2009) would be more appropriate.”