Geostatistical Analysis and Mitigation of the Atmospheric Phase Screens in Ku-Band Terrestrial Radar Interferometric Observations of an Alpine Glacier
Metadata only
Date
2020-11Type
- Journal Article
Abstract
Terrestrial radar interferometry (TRI) can measure displacements at high temporal resolution, potentially with high accuracy. An application of this method is the observation of the surface flow velocity of steep, fast-flowing aglaciers. For these observations, the main factor limiting the accuracy of TRI observations is the spatial and temporal variabilities in the distribution of atmospheric water vapor content, causing a phase delay [atmospheric phase screen (APS)] whose magnitude is similar to the displacement phase. This contribution presents a geostatistical analysis of the spatial and temporal behaviors of the APS in Ku-Band TRI. The analysis is based on the assumption of a separable spatiotemporal covariance structure, which is tested empirically using variogram analysis. From this analysis, spatial and temporal APS statistics are estimated and used in a two-step procedure combining regression-Kriging with generalized least squares (GLS) inversion to estimate a velocity time-series. The performance of this method is evaluated by cross-validation using phase observations on stable scatterers. This analysis shows a considerable reduction in residual phase variance compared with the standard approach of combining the linear models of APS stratification and interferogram stacking. Show more
Publication status
publishedExternal links
Journal / series
IEEE Transactions on Geoscience and Remote SensingVolume
Pages / Article No.
Publisher
IEEESubject
Atmospheric modeling; Atmospheric phase screen (APS); Differential radar interferometry (D-InSAR); Synthetic aperture radar (SAR); Terrestrial radar interferometry (TRI)Organisational unit
03849 - Hajnsek, Irena / Hajnsek, Irena
08704 - SAR Tomographie und PSI Deformationsb.
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