Focused SAR Image Formation of Moving Targets Based on Doppler Parameter Estimation
This paper addresses the matter of focusing moving targets in artificial aperture radar (SAR) images. This task is solved here by using an inverse SAR (ISAR) technique. The ISAR technique performs an autofocus procedure by implementing exhaustive search algorithms, which are improved by classical convex optimization, of functions based mostly on image distinction or entropy. During this paper, we tend to discuss the chance to perform an autofocus ISAR technique by exploiting the estimation of the target Doppler parameters, particularly the Doppler centroid and also the Doppler rate, which are related to the target motion parameters. The current algorithm is predicated on the reuse of efficient autofocus approaches that are classically used in direct SAR imaging. The effectiveness of the proposed method is tested on COSMO-SkyMed Spotlight SAR data of maritime targets. Furthermore, the proposed Doppler parameter estimation algorithm is compared with a widely known ISAR technique, specifically the image-distinction-based mostly technique.
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