qFSP reduction for ionosphere#333
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This PR introduces qFSP phase-slip artifact correction into the ionosphere phase correction workflow. The main goal is to prevent qFSP-related phase artifacts in the differential interferogram from propagating into the estimated dispersive ionosphere phase screen.
The correction is applied before dispersive and non-dispersive phase estimation. This ensures that compute_disp_nondisp() uses the qFSP-corrected differential phase rather than the original differential phase containing phase-slip artifacts.
The qFSP artifact region is identified using the InSAR mask anomaly bits derived from the reference and secondary
inputDataExceptionMaskfields. Non-anomaly pixels are used to estimate a smooth background phase, and the qFSP artifact template is estimated and removed from the affected region.The qFSP artifact region is identified from the InSAR mask anomaly bits derived from the reference and secondary inputDataExceptionMask fields. Reliable non-anomaly pixels are used to fit a smooth background phase using a low-order polynomial surface. The qFSP artifact is then estimated from the residual between the original differential phase and the fitted background inside the anomaly region.
The estimated artifact is smoothed, optionally feathered near the artifact boundary, and subtracted from the original differential phase. This removes localized qFSP phase-slip artifacts while preserving the large-scale phase structure needed for ionosphere estimation.