In your first step make sure to apply the corrected orbits.
For insar processing you don’t need calibration or speckle filter.
Have a look at the insar tutorials at http://step.esa.int/main/doc/tutorials/
and especially at http://www.esa.int/About_Us/ESA_Publications/InSAR_Principles_Guidelines_for_SAR_Interferometry_Processing_and_Interpretation_br_ESA_TM-19
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