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Reliable estimation of orbit errors in spaceborne SAR interferometry. The network approach

Bähr, Hermann 1; Hanssen, Ramon F.
1 Geodätisches Institut (GIK), Karlsruher Institut für Technologie (KIT)

Abstract:

An approach to improve orbital state vectors by orbit error estimates derived from residual phase patterns in synthetic aperture radar interferograms is presented. For individual interferograms, an error representation by two parameters is motivated: the baseline error in cross-range and the rate of change of the baseline error in range. For their estimation, two alternatives are proposed: a least squares approach that requires prior unwrapping and a less reliable gridsearch method handling the wrapped phase. In both cases, reliability is enhanced by mutual control of error estimates in an overdetermined network of linearly dependent interferometric combinations of images. Thus, systematic biases, e.g., due to unwrapping errors, can be detected and iteratively eliminated. Regularising the solution by a minimum-norm condition results in quasi-absolute orbit errors that refer to particular images. For the 31 images of a sample ENVISAT dataset, orbit corrections with a mutual consistency on the millimetre level have been inferred from 163 interferograms. The method itself qualifies by reliability and rigorous geometric modelling of the orbital error signal but does not consider interfering large scale deformation effects. ... mehr


Volltext §
DOI: 10.5445/IR/1000029390
Originalveröffentlichung
DOI: 10.1007/s00190-012-0571-6
Scopus
Zitationen: 34
Web of Science
Zitationen: 32
Dimensions
Zitationen: 33
Cover der Publikation
Zugehörige Institution(en) am KIT Geodätisches Institut (GIK)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2012
Sprache Englisch
Identifikator ISSN: 0949-7714
urn:nbn:de:swb:90-293900
KITopen-ID: 1000029390
Erschienen in Journal of Geodesy
Verlag Springer Verlag
Band 86
Heft 12
Seiten 1147-1164
Nachgewiesen in Web of Science
Scopus
Dimensions
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