You can try this:
- TOPSAR Split
- Apply Orbit Files
- Calibration
- TOPSAR Deburst
- Polarimetric Decomposition
- Terrain Correction
Or using multilooking and speckle filter:
- TOPSAR Split
- Apply Orbit Files
- Calibration
- TOPSAR Deburst
- Multilooking
- Polarimetric Speckle
- Polarimetric Decomposition
- Terrain Correction