SENTINEL-1 TOPS data focusing based on a modified two-step processing approach

We present a simple solution for the phase-preserving focusing of Terrain Observation with Progressive Scan (TOPS) Sentinel-1 data. The proposed algorithm focuses each raw data burst independently. In particular, after a conventional range data compression, it is based on a modification of the two-step processing approach formerly developed to focus spotlight and hybrid stripmap/spotlight SAR data.The presented results relevant to a real Sentinel-1 data acquired over central Italy confirm the effectiveness of the proposed approach.