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Tropospheric delay corrections to differential InSAR results from GPS observations
Citation
Janssen, V and Ge, L and Rizos, C, Tropospheric delay corrections to differential InSAR results from GPS observations, Proceedings of the 6th International Symposium on Satellite Navigation Technology, July 22-25 2003, Melbourne, Victoria, pp. 1-12. ISBN 0-646-42494-7 (2003) [Refereed Conference Paper]
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Copyright Statement
Copyright 2003 Menay Pty Ltd
Official URL: http://www.gps-society.org/satnav2003.html
Abstract
Differential Interferometric Synthetic Aperture Radar (DInSAR) techniques have been recognised as well-suited for ground deformation monitoring applications. However, the spatially and temporally variable delay of the radar signal propagating through the atmosphere represents a major limitation to accuracy. The dominant factor to be considered is the tropospheric heterogeneity, which can lead to misinterpretation of DInSAR results. In this paper a between-site and between-epoch double-differencing algorithm for the generation of tropospheric corrections to DInSAR results based on GPS observations is proposed. In order to correct the radar results on a pixel-by-pixel basis, the GPS-derived corrections have to be interpolated. Using GPS data from the Southern California Integrated GPS Network (SCIGN) it has been found that the inverse distance weighted and Kriging interpolation methods are more suitable than the spline method. Differential corrections as much as several centimetres may have to be applied in order to ensure sub-centimetre accuracy for the DInSAR result and it seems optimal to estimate the tropospheric delay from GPS data at 5-minute intervals. The algorithm and procedures described in this paper could easily be implemented in a continuous GPS data centre. The interpolated image of between-site, single-differenced tropospheric delay can be provided as a routine product to assist radar interferometry.
Item Details
Item Type: | Refereed Conference Paper |
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Keywords: | InSAR, GPS, tropospheric corrections, interpolation |
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: | 33356 |
Year Published: | 2003 |
Deposited By: | Geography and Environmental Studies |
Deposited On: | 2005-07-08 |
Last Modified: | 2014-06-06 |
Downloads: | 292 View Download Statistics |
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