Multi-Step Reiterative Super Resolution: Robust Doppler-Angle Spectrum Estimation of Accelerated Targets with Antenna Position Errors

Recently, ReIterative Super Resolution (RISR) has gained attention in radar signal processing. RISR inherently provides a high-resolution angular spectrum. By expanding its error model, accurate spectrum calculations can be achieved, even with antenna position errors. However, this error model extension has previously been limited to antenna position errors alone. In this paper, we introduce a multi-step RISR (MS-RISR) algorithm designed for accurate estimation of a two-dimensional Doppler-angle spectrum in scenarios involving accelerated targets observed by array antennas with antenna position errors. The proposed algorithm redefines the acceleration components of the targets as velocity observation errors, thereby incorporating both antenna position and velocity observation errors into its system model to achieve an accurate Doppler-angle spectrum. Simulations demonstrate that the MS-RISR algorithm, consisting of multiple processing steps, can estimate the Doppler-angle spectrum with high resolution.