Sentinel-1A GRD product

[ABraun]

as early as possible I’d say.

@lveci

The noise removal should be done before calibration.

@ABraun

If you don’t need the phase information you can also download it as a GRD product and only apply the following:

Thermal noise removal
Apply Orbit file
Calibration to Beta0
(Speckle filtering)
Radiometric terrain flattening
Range Doppler Terrain Correction