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Proceedings Paper

An empirical model for interferometric coherence
Author(s): F. Chaabane; F. Tupin; H. Maitre
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Paper Abstract

Many are the examples of application of SAR and differential SAR interferometry for topographic mapping and ground deformation monitoring. However, on repeat pass geometry, the performances of these two techniques are limited by the loss of correlation (coherence) between the two radar acquisitions. The lack of coherence causes an additional noise thus a poor estimate of the interferometric phase. The disturbances can be due either to surface changes because of long period cover (temporal decorrelation) or to a too large baseline (spatial decorrelation). In this paper, we propose an empirical model for the estimate of coherence considering separately these two sources of disturbances. Starting from the observations of experimental data, we study the behaviour of coherence according to baseline and period cover in order to express the two terms of correlation. A number of 170 multi temporal and multi baseline differential interferograms covering the same region is used to validate the proposed model.

Paper Details

Date Published: 12 October 2005
PDF: 9 pages
Proc. SPIE 5980, SAR Image Analysis, Modeling, and Techniques VII, 59800E (12 October 2005); doi: 10.1117/12.627341
Show Author Affiliations
F. Chaabane, URISA-SUP'COM (France)
F. Tupin, GET-Télécom-Paris, CNRS (France)
H. Maitre, GET-Télécom-Paris, CNRS (France)

Published in SPIE Proceedings Vol. 5980:
SAR Image Analysis, Modeling, and Techniques VII
Francesco Posa, Editor(s)

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