A Sidelobe Suppression Method for Circular Ground-Based SAR 3D Imaging Based on Sparse Optimization of Radial Phase-Center Distribution

Circular ground-based SAR (GBSAR) is a new 3D imaging GBSAR with the potential of acquiring high-quality images and deformation. However, its donut-shaped spectrum short radius antenna rotation cause high sidelobes on curved surfaces, resulting in poor quality. The multi-phase-center circular full array can effectively suppress by filling to be equivalent solid spectrum, but it requires larger number phase centers, increasing system cost engineering difficulties. In this paper, sidelobe suppression method for based sparse optimization radial phase-center distribution proposed at low cost. By deriving point spread function (PSF) taking peak level (PSL) integrated (ISL) derived PSF as multi-objective functions, we solve problem optimize centers. advantage that solved optimal limited Finally, effect verified via simulations.