Multibaseline interferometry for natural scatterer characterisation

Francesco De Zan(1) , Fabio Rocca(1) , and Konstantinos Papathanassiou(2)

(1) Politecnico Milano, Piazza L. Da Vinci 32, 20133 Milano, Italy
(2) German Aerospace Center (DLR), Oberpfaffenhofen, Post Box 1116, D-82230 Wessling, Germany


Multibaseline interferometric techniques have been addressed in terms of the Permanent Scatterer (PS) technique allowing a very accurate estimation of the position and the motion of individual scatterers. The obtained results are based on the utilisation of stable - in terms of spatial and temporal baseline observations - scatterers. While the majority of these stable scatterers are man-made, natural scatterers - in general - do not fulfill the required stability, either with respect to baseline (geometric decorrelation) or with respect to temporal changes (temporal decorrelation).

In this paper,the spatial and temporal variation of the radiation pattern of natural distributed scatterers is investigated with respect to their physical characterisation. The analysis is based on a coherence matrix eigenvector formulation that can help the interpretation and estimation process. Real and simulated multi-baseline data are used to demonstrate the main ideas and to draw first conclusions about the design of future multibaseline configurations.


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