You should use the TOPS coregistration rather than using cross correlation and warp. Otherwise you may get phase jump between bursts in some scenes.
Speckle filtering is applied only on the intensity and your output will not be complex data.
The Goldstein filter is to make the phase less noisy. The azimuth and range filtering is to filter the non-overlapping spectra when the Doppler centroid frequency of the master and slave products are different.
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