Focusing algorithms analysis for Ground-Based SAR images

Ground-Based Synthetic Aperture Radar (GB-SAR) is emerging as a relatively new system for specific short ranges and frequent monitoring applications. The main GB-SAR focusing algorithms proposed in literature are compared in terms of focusing quality and ability to manage the approximation of the space-varying two-dimensional kernel. Residual migration and phase errors which have implications on the target impulse response deformation, are given both in analytic and numerical forms, using simulations and real data acquired with a Ku-band system.