Dear Sentinel experts:
Please bear with me, as I am a new user with SAR data, and in some my post the answers haven’t been really clear to me.
I am trying to do Intensity and Coherence correlation analysis between 2 S1AIW images with dual Polarizartion VVVH. I have followed the tutorial S1TBX TOPSAR Interferometry. This tutorial however, does not perform geometric calibration, radiometric calibration or multilooking analysis and works with single polarised images.
I have the following question which I hope you can help me answer:

Do I need to perform calibration, radiometric and multilooking analysis. And if so, where in the workflow.

For multilooking analysis which ratio should I use? I have images of 5m *20 m resolution and the concept of multilooking is not very clear for me.

Which polarization should I use as I have 2 per subswath VV or VH? Is there any difference?

I have seen that the final result of the Interferometric process produces 3 bands, Phase, Intensity and Coherence. For the coherence correlation I believe is very straight forward and the values range from 01 as expected. I need to run this estimation using different windows sizes and I believe is possible. I just want to know if my line of thinking is correct here.

I have a formula for intensity correlation which I have attached as an image to this treat. The intensity band on the final interferometric process however leads to huge values and I dont know what I need to do to get values that range from 01 or how to apply the steps of the formula.
I wish you can help me out. Please take a look at the image for the formula.