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Network Adjustment of Orbit Errors in SAR Interferometry

Bähr, Hermann; Hanssen, Ramon F.

Abstract:
Orbit errors can induce significant long wavelength error signals in synthetic aperture radar (SAR) interferograms and thus bias estimates of wide-scale deformation phenomena. The presented approach aims for correcting orbit errors in a preprocessing step to deformation analysis by modifying state vectors. Whereas absolute errors in the orbital trajectory are negligible, the influence of relative errors (baseline errors) is parametrised by their parallel and perpendicular component as a linear function of time. As the sensitivity of the interferometric phase is only significant with respect to the perpendicular baseline and the rate of change of the parallel baseline, the algorithm focuses on estimating updates to these two parameters. This is achieved by a least squares approach, where the unwrapped residual interferometric phase is observed and atmospheric contributions are considered to be stochastic with constant mean. To enhance reliability, baseline errors are adjusted in an overdetermined network of interferograms, yielding individual orbit corrections per acquisition.

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Volltext §
DOI: 10.5445/IR/1000028180
Zugehörige Institution(en) am KIT Geodätisches Institut (GIK)
Publikationstyp Proceedingsbeitrag
Jahr 2010
Sprache Englisch
Identifikator ISBN: 978-92-9221-241-4
ISSN: 1609-042X
urn:nbn:de:swb:90-281805
KITopen-ID: 1000028180
Erschienen in Proceedings of the Workshop FRINGE 2009 : 30 November - 4 December 2009, Frascati, Italy. Ed.: H. Sawaya-Lacoste
Verlag ESA Communications, Noordwijk (Niederlande)
Serie Special publications / European Space Agency (ESA SP) ; 677
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