Analysis of the 2-D spectral supports in SAR spotlight acquisition mode

The spotlight acquisition mode of Synthetic Aperture Radar (SAR) offers high spatial resolution in the azimuth direction. Generally, the Omega-K algorithm is used for the focusing process of the spotlight acquisition mode with defined processing steps. However, a suitable region selection after the Stolt interpolation remains unclear. In this paper, we generate spotlight echo data with several point targets and process the focused image using the Omega-K algorithm. We propose an analysis of region selection based on the 2-D spectral supports for final imaging. Particularly, the quality of the final image depends significantly on the chosen region within the 2-D spectral supports. We present analysis results on suitable region selection and full aperture utilization. In conclusion, we propose a method for selecting a suitable region. It is crucial for the final image quality.