Abstract:

A 3D motion and geometric information system of single-antenna radar is proposed, which can be supported by spotlight synthetic aperture radar (SAR) system and inverse SAR (ISAR) system involving relative 3D motion of the rigid target. In this system, applying the geometry invariance of the rigid target, the unknown 3D shape and motion of the radar target can be reconstructed from the 1D range data of some scatterers extracted from the high-resolution range image. Compared with the current 1D-to-3D algorithm, in the proposed algorithm, the requirement of the 1D range data is expanded to incomplete formation involving large angular motion of the target and hence, the quantity of the scatterers and the abundance of 3D motion are enriched. Furthermore, with the three selected affine coordinates fixed, the multi-solution problem of the reconstruction is solved and the technique of nonlinear optimization can be successfully utilized in the system. Two simulations are implemented which verify the higher robustness of the system and the better performance of the 3D reconstruction for the radar target with unknown relative motion.