Articolo in rivista, 2022, ENG, 10.1109/TGRS.2021.3055648

Atmospheric Phase Screen Compensation on Wrapped Ground-Based SAR Interferograms

Falabella F.; Perrone A.; Stabile T.A.; Pepe A.

a. School of Engineering, University of Basilicata, Potenza, 85100, Italy b. Institute of Methodologies for Environmental Analysis (IMAA), National Research Council (CNR) of Italy, Tito, 85050, Italy c. Institute for the Electromagnetic Sensing of the Environment (IREA), National Research Council (CNR) of Italy, Naples, 80124, Italy

This work proposes a method for estimating and compensating the atmospheric phase screen (APS) in sets of synthetic aperture radar (SAR) interferograms generated with a ground-based SAR (GB-SAR) instrument. We address the presented approach's physical, statistical, and mathematical framework by discussing its potential and limitations. In contrast with other existing algorithms that estimate the APS from the unwrapped phase signals, our methodology is based on the straightforward analysis of the wrapped phases, directly. Therefore, the method is not affected by any potential phase unwrapping mistake, and it is suitable for multitemporal interferometric SAR (InSAR) applications. The effects of the local topography, the decorrelation noise, and the ground deformation on the APS estimates are deeply studied. Experiments performed on simulated and real GB-SAR InSAR data corroborate the validity of the theory. In particular, the simulated results show that the method is beneficial in zones with medium-to-high topographic slopes (e.g., for Alpine and mountainous regions).

IEEE transactions on geoscience and remote sensing 60 , pp. Art.n.5202115-1–Art.n.5202115-15

Keywords

Ground-based, Radar, atmosphere, interferometry

CNR authors

Falabella Francesco, Perrone Angela, Pepe Antonio, Stabile Tony Alfredo

CNR institutes

IMAA – Istituto di metodologie per l'analisi ambientale, IREA – Istituto per il rilevamento elettromagnetico dell'ambiente