Ifg problems with ERS and ENVISAT

Microwave Toolbox Interferometry
#1

I am currently working on the last project of my degree in Geomatics at the University of Jaén (Spain). This addresses the way to quantify the ground deformation caused by earthquakes.

I am using SNAP software to analyse some images of ERS, ENVISAT and ALOS in order to compare the results from L’Aquila earthquake happened on 6/April/2009.

For ENVISAT, I’m using this images:

ASA_IMS_1PNESA20090201_092421_000000182076_00079_36205_0000.N1
ASA_IMS_1PNESA20090412_092420_000000182078_00079_37207_0000.N1

And for ERS:

SAR_IMS_1PXESA20090415_211845_00000016A146_00129_73129_0002.E2
SAR_IMS_1PXESA20090308_095517_00000017A145_00079_72578_0168.E2

I’m following the sames steps like sentinel process, but i dont obtain any results in the interferogram.

  1. Apply Orbits
  2. Subset and Multillok.
  3. Coregistration.
  4. ifg.
    am I forgotten some step? i got the same problem for ERS…

I would really appreciate yours answers.