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Tropospheric corrections to SAR interferometry from GPS observations


Janssen, V and Ge, L and Rizos, C, Tropospheric corrections to SAR interferometry from GPS observations, GPS Solutions, 8, (3) pp. 140-151. ISSN 1080-5370 (2004) [Refereed Article]


Copyright Statement

Copyright 2004 Springer

DOI: doi:10.1007/s10291-004-0099-1


Interferometric Synthetic Aperture Radar (InSAR) techniques have been recognised as an ideal tool for many ground deformation monitoring applications. However, the spatially and temporally variable delay of the radar signal propagating through the atmosphere is a major limitation to accuracy. The dominant factor to be considered is the tropospheric heterogeneity, which can lead to misinterpretation of InSAR results. In this paper a between-site and between-epoch double-differencing algorithm for the generation of tropospheric corrections to InSAR results based on GPS observations is tested. In order to correct the radar results on a pixel-by-pixel basis, the GPS-derived corrections have to be interpolated. Using experimental data it has been found that the inverse distance weighted and kriging interpolation methods are more suitable than the spline interpolation method. Differential corrections as large as several centimetres may have to be applied in order to ensure subcentimetre accuracy for the InSAR result. The algorithm and procedures described in this paper could easily be implemented in a continuous GPS network data centre. The interpolated image of between-site, singledifferenced tropospheric delays can be derived as a routine product to assist radar interferometry.

Item Details

Item Type:Refereed Article
Keywords:InSAR, GPS, troposphere, corrections
Research Division:Earth Sciences
Research Group:Geophysics
Research Field:Geodesy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Janssen, V (Dr Volker Janssen)
ID Code:33346
Year Published:2004
Web of Science® Times Cited:36
Deposited By:Geography and Environmental Studies
Deposited On:2005-07-08
Last Modified:2014-06-05
Downloads:209 View Download Statistics

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