I'm using SNAP to create and interferogram. The images are S1A and S1B_IW_SLC_1SDV. After splitting the images I try to apply Radiometric Calibration as the Sentinel images are from 2016. However, it does not generate intensity bands. I keep all processing parameters as default. The sigma0 output it creates I cannot use for S-1 Back geocoding. Does anyone know this problem?