3-D ISAR imaging reconstruction of non-uniformly rotating targets with FRFT technique

In this paper, a novel 3D ISAR image reconstruction method based on FRFT is proposed. Although the RID algorithm, based on time-frequency analysis, has been used to improve the 2D image of the non-uniformly rotating target, the 3D image reconstruction is difficult for the conventional time-frequency analysis method. To solve this problem, we introduce the FRFT technique to reconstruct the 3D ISAR image of the non-uniformly rotating target. For its good property, the high resolution 2D image can be achieved effectively, as well as the interferometric phase difference can be extracted easily. So the final 3D ISAR image of the non-uniformly rotating target can be reconstructed effectively.