How to use polarimetric module in SNAP?

There are some function in polarimetric module, for example:Launch PolSARPro Polarimetric Matrix Generation…etc.
I’m confused, how to use sentinel-1 in this module?
Recently I committed to the study of Polarimetric SAR interferometry measurement, Whether it is feasible?
Thank you!

Sentinel-1 (and many other SAR satellites) only operates in single or dual polarisation. For the polarimetric matrix generation and most other PolSAR applications) you need quad-polarized data (HH/HV/VH/VV) which is acquired by only few SAR satellites (ALOS, Radarsat, few TerraSAR-X scenes).

Please also have a look at this post:

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