Azimuth Shift

Sentinel-1 Azimuth Shift

This operator follows the Range Shift operator in the TOPS InSAR processing chain. It first estimates a global azimuth offset for the whole sub-swath of the split S-1 SLC image using a Enhanced Spectral Diversity (ESD) method. The ESD approach exploits the data at the overlapped area of the adjacent bursts. The estimation is done for every overlapped area and the final azimuth offset is obtained by averaging all the estimations.

The operator then performs shift in azimuth direction for every burst using the offset computed above with a phase ramp method in frequency domain.

Input

• The input to this operator is the resulting product from the S-1 Range Shift operator. It is the co-registered master and slave images for the same sub-swath and same polarization (e.g. IW1 - VV).

Output

• The output of the operator are the co-registered master and slave bands in I/Q format with the slave bands shifted by a small amount in azimuth direction.

Parameters Used

• No parameter is needed for this operator.