Alicja Ossowska

Processing of Sliding Spotlight Mode Data with Consideration of Orbit Geometry

In this paper a processing algorithm for sliding spotlight SAR raw data with consideration of orbit geometry is presented. The processing is based on the chirp scaling algorithm with a pre-processing step for the sliding spotlight mode. The chirp scaling processing algorithm for SAR raw data assumes a flat Earth geometry. This approximation is not valid for a high resolution satellite Proposed algorithm considers a circular orbit and corrects the processing algorithm accordingly through a range dependent velocity ratio. The processing algorithm is evaluated on a simulated raw data of a scene consisting of ideal point targets.

Hybrid strip-map/spotlight mode processing based on chirp scaling processing

The hybrid mode provides radar images with resolution better than in stripmap mode with swath length longer than in the spotlight mode. In the paper described is a processor for hybrid radar data. The algorithm bases on the chirp scaling algorithm. In order to process the hybrid mode data an azimuth filter is applied before the chirp scaling algorithm.