Displacement from Sentinel1

A nice tutorial with TerraSAR-X data is given here:
https://saredu.dlr.de/unit/insar_deformation

InSAR processing with Sentinel-1 data is demonstrated here:
http://sentinel1.s3.amazonaws.com/docs/S1TBX%20TOPSAR%20Interferometry%20with%20Sentinel-1%20Tutorial.pdf

Theory behind InSAR
http://earth.esa.int/workshops/ers97/program-details/speeches/rocca-et-al/

This source describes how fringes can be interpreted:
http://vldb.gsi.go.jp/sokuchi/sar/mechanism/interpretation-e.html
http://vldb.gsi.go.jp/sokuchi/sar/mechanism/mechanism04-e.html

These topics may also clear some questions: