A New Algorithm for Processing Interferometric Data-Stacks: SqueeSAR

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Journal Article: A New Algorithm for Processing Interferometric Data-Stacks: SqueeSAR

Abstract

Permanent Scatterer SAR Interferometry (PSInSAR) aims to identify coherent radar targets exhibiting high phase stability over the entire observation time period. These targets often correspond to point-wise, man-made objects widely available over a city, but less present in non-urban areas. To overcome the limits of PSInSAR, analysis of interferometric data-stacks should aim at extracting geophysical parameters not only from point-wise deterministic objects (i.e., PS), but also from distributed scatterers (DS). Rather than developing hybrid processing chains where two or more algorithms are applied to the same data-stack, and results are then combined, in this paper we introduce a new approach, SqueeSAR, to jointly process PS and DS, taking into account their different statistical behavior. As it will be shown, PS and DS can be jointly processed without the need for significant changes to the traditional PSInSAR processing chain and without the need to unwrap hundreds of interferograms, provided that the coherence matrix associated with each DS is properly “squeezed” to provide a vector of optimum (wrapped) phase values. Results on real SAR data, acquired over an Alpine area, challenging for any InSAR

analysis, confirm the effectiveness of this new approach.

Authors 
Alessandro Ferretti, Alfio Fumagalli, Fabrizio Novali, Claudio Prati, Fabio Rocca and Alessio Rucci








Published Journal 
IEEE Transactions on Geoscience and Remote Sensing, 2011





DOI 
10.1109/TGRS.2011.2124465

Online 
Internet link for A New Algorithm for Processing Interferometric Data-Stacks: SqueeSAR

Citation

Alessandro Ferretti,Alfio Fumagalli,Fabrizio Novali,Claudio Prati,Fabio Rocca,Alessio Rucci. 2011. A New Algorithm for Processing Interferometric Data-Stacks: SqueeSAR. IEEE Transactions on Geoscience and Remote Sensing. 49(9):3460-3470.