SRTM oversampling for geocoding

Hi all,

Regarding to the right parameter setting, I am wondering what is the correct number as oversampling factor for the geocoding of an S1 SLC with an SRTM DEM. SRTM has the resolution 1 arc sec ~ 30 m in both directions. Is 2 in azimuth and 6 in range right? Or if we used a 5x1 multilooking it should be around 2 in range, just to match the two product’s resolution…

Thanks in advance!