Kunpu Ji
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View article: Some new insights into efficient improved singular spectrum analysis for processing incomplete geodetic time series
Some new insights into efficient improved singular spectrum analysis for processing incomplete geodetic time series Open
View article: One-step estimation of non-seasonal terrestrial water storage variation in Southeastern China
One-step estimation of non-seasonal terrestrial water storage variation in Southeastern China Open
Accurate estimation of non-seasonal signals (NSSs) of Terrestrial Water Storage Anomaly (TWSA) from Gravity Recovery and Climate Experiment monthly gravity field models is essential for identifying and understanding extreme hydrological ph…
View article: An efficient improved singular spectrum analysis for processing GNSS position time series with missing data
An efficient improved singular spectrum analysis for processing GNSS position time series with missing data Open
SUMMARY The improved SSA (ISSA) method is widely recognized for directly extracting signals from gappy time-series without requiring prior interpolation. However, it is rather time consuming, particularly for long time-series with large wi…
View article: A multiple-parameter regularization approach for filtering monthly GRACE/GRACE-FO gravity models
A multiple-parameter regularization approach for filtering monthly GRACE/GRACE-FO gravity models Open
The Gravity Recovery and Climate Experiment (GRACE) and its subsequent GRACE Follow-On (GRACE-FO) missions have been instrumental in monitoring Earth’s mass changes through time-variable gravity field models. However, these models su…
View article: Covariance Matrix Reconstruction of GRACE Monthly Solutions Using Common Factors and Individual Formal Errors
Covariance Matrix Reconstruction of GRACE Monthly Solutions Using Common Factors and Individual Formal Errors Open
Accurate error covariance is crucial for postprocessing gravity recovery and climate experiment (GRACE) gravity field solutions in terms of spherical harmonic coefficients (SHCs). Unfortunately, most GRACE SHC products only provide formal …
View article: Evaluation of Terrestrial Water Storage and Flux in North China by Using GRACE Combined Gravity Field Solutions and Hydrometeorological Models
Evaluation of Terrestrial Water Storage and Flux in North China by Using GRACE Combined Gravity Field Solutions and Hydrometeorological Models Open
To enrich the understanding of the dynamic evolution of the water resources in North China, terrestrial water storage anomalies (TWSA) from January 2003 to June 2017 are derived using the new GRACE time-variable gravity field model Tongji-…
View article: Signal Extraction from GNSS Position Time Series Using Weighted Wavelet Analysis
Signal Extraction from GNSS Position Time Series Using Weighted Wavelet Analysis Open
The daily position time series derived by Global Navigation Satellite System (GNSS) contain nonlinear signals which are suitably extracted by using wavelet analysis. Considering formal errors are also provided in daily GNSS solutions, a we…
View article: A Wavelet-Based Outlier Detection and Noise Component Analysis for GNSS Position Time Series
A Wavelet-Based Outlier Detection and Noise Component Analysis for GNSS Position Time Series Open
Various signals of crustal deformation and mass loading deformation are contained in a GNSS position time series. However, a GNSS position time series is also polluted by outliers and various colored noise, which must be reasonably modelle…