Hybrid CramÉr-Rao Bounds for Crustal Displacement Field Estimators in SAR Interferometry

This paper focuses on the performance achievable by spaceborne Synthetic Aperture Radar Interferometry (InSAR) in the estimation of line-of-sight crustal deformations from acquisitions over a distributed scatterer. Our model is suited for exploiting the Hybrid Cramér-Rao Bound (HCRB), where the unknowns are both deterministic parameters and stochastic variables. We take into account both target decorrelation and Atmospheric Phase Screen (APS). This approach leads to a viable evaluation of InSAR performance as a function of system configuration, target decorrelation, and APS variance.