A Novel Imaging Method for MEO SAR-GMTI Systems

This paper proposed an efficient imaging method for medium-Earth-orbit (MEO) synthetic aperture radar (SAR) ground moving target indication (GMTI) systems. MEO SAR is an attractive tool for GMTI applications, because of its advantages of large coverage, short revisit time and strong damage resistance. In this paper, first, the third-order Taylor-approximated range model of a moving target for MEO SAR is developed. Then, based on the proposed range model, the target's 2-D spectrum is derived and a novel imaging method is proposed. The proposed imaging method implements focusing without a priori knowledge of targets' motion parameters and position parameters. Finally, numerical results validate the proposed method.