Sentinel-1 IW GRD cluttered noise

My problem is comparable (but not the same) as the one mentioned here.

The data is badly damaged and I dont think this is the sort of noise that can be removed by “Thermal Noise correction“ or “Speckel filtering“. It is neither as regular as being a radio frequency interference (RFI) from the ground.

Is there a name for such noise? Does it have a known source? Is there a remedy?

Those definitely looks like interference to me.
You can technically remove them from Level-0 data but I haven’t tried. A simpler way would be by sub-aperture processing but it does lower the spatial resolution.

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Yes that is RFI, possibly a radar.

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