I’m mostly referring to the Sentinel-1 Preprocessing article.
Points 1 and 2 are straightforward (thermal noise removal and sigma0 calibration with the internal look-up tables). I am lost however at the Terrain correction description:
Orthorectification converts data from ground range geometry, which does not take terrain into account, to σ°
Does that mean you used Apply radiometric normalization and Save sigma0 band with the projected local incidence angle? Or just Range Doppler Terrain correction with sigma0 as input band?
All my GRD products state in the annotation xml files
<thermalNoiseCorrectionPerformed>false</thermalNoiseCorrectionPerformed. This should mean that thermal noise has not been removed, shouldn’t it? Can you point to a documentation that states that noise is removed by the PDGS?