A New Algorithm for Processing Interferometric Data-Stacks: SqueeSAR
A. Ferretti and A. Fumagalli and F. Novali and C. Prati and F. Rocca and A. Rucci

@ARTICLE{5765671,
author={A. Ferretti and A. Fumagalli and F. Novali and C. Prati and F. Rocca and A. Rucci},
journal={IEEE Transactions on Geoscience and Remote Sensing},
title={A New Algorithm for Processing Interferometric Data-Stacks: SqueeSAR},
year={2011},
volume={49},
number={9},
pages={3460-3470},
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.},
keywords={data analysis;geophysical techniques;radar interferometry;radar signal processing;remote sensing by radar;synthetic aperture radar;Alpine area;PSInSAR;SqueeSAR;city;coherence matrix;coherent radar targets;distributed scatterers;geophysical parameters;high phase stability;interferograms;interferometric data-stacks processing algorithm;man-made objects;permanent scatterer SAR interferometry;point-wise objects;statistical behavior;Coherence;Covariance matrix;Decorrelation;Estimation;Pixel;Radar imaging;Coherence matrix;InSAR;distributed scatterers (DS);permanent scatterers;space-adaptive filtering},
doi={10.1109/TGRS.2011.2124465},
ISSN={0196-2892},
month={Sept},}