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Shown below is the processing methodology for differential interfeometry for airborne repeat track interferometry (RTI). Unlike processing of spaceborne RTI data, where the flight path is very smooth over time such that residual errors can be easily modeled after initial processing, airborne flight tracks are not known sufficiently well in advance. It is necessary to use the data themselves to refine the time-varying the baseline between flight tracks, reprocess the data with updated flight track information, then proceed with interferometric processing.