Articolo in rivista, 2022, ENG, 10.1109/TGRS.2022.3216083

On the Phase Non-Closure of Multi-look SAR Interferogram Triplets

Falabella F.; Pepe A.

School of Engineering, University of Basilicata, Potenza, Italy, ; Institute for the Electromagnetic Sensing of the Environment (IREA), National Research Council (CNR) of Italy, Naples, Italy, , ; Institute for the Electromagnetic Sensing of the Environment (IREA), National Research Council (CNR) of Italy, Naples, Italy, ,

This work explores the properties characterizing the phase non-closure of multi-look synthetic aperture radar (SAR) interferograms. Specifically, we study the implications of multi-look phase time incongruences on the generation of ground displacement time-series through small baseline (SB) multi-temporal InSAR (Mt-InSAR) methods. Our research clarifies how these phase inconsistencies can propagate through a time-redundant network of SB interferograms and contribute, along with phase unwrapping (PhU) errors, to the quality of the generated ground displacement products. Moreover, we analyze the effects of short-lived phase bias signals that could happen in sequences of short baseline (SB) interferograms and propose a strategy for their mitigation. The developed methods have been tested using both simulated and real SAR data. The latter were collected by the Sentinel-1A/B (C-band) sensors over the study areas of Nevada state, U.S., and Sicily Island, Italy.

IEEE transactions on geoscience and remote sensing

Keywords

InSAR, deformation

CNR authors

Falabella Francesco, Pepe Antonio

CNR institutes

IREA – Istituto per il rilevamento elettromagnetico dell'ambiente