Range Cell Migration Correction for Phase Error Compensation of Highly Squinted SAR

Abstract:
Phase error compensation within motion compensation techniques requires range cell migration corrected SAR data. The main contribution of this paper is providing a non-approximated range cell migration correction (RCMC) for processing highly squinted SAR data. Embedded in the conventional Ω-K processing, the approach consists of two coordinate transformations carried out in the 2D frequency domain and a modification made to the 2D matched filter. The first coordinate transformation is a rotation that removes the effect of the squint angle, the second one is an azimuth wavenumber dependent shift of the range wavenumber. It is shown that the proposed approach works for squint angles up to 60deg.