Radar Imaging Of Non-ideal Scattering Analysis

In synthetic aperture radar (SAR) and inverse SAR (ISAR) imaging, most image algorithms are based on the model of standard scattering centers. But the scattering of targets is complexity, the standard scattering centers model cannot describe all scattering centers of target. Those nonideal scattering centers make the imaging blur, but they also contain the feature of target. In this paper, we do research about the nonideal scattering centers.In this paper, we first classify the nonideal scattering centers to three kinds through analysis the assumption of ideal scattering centers model. They are dispersive scattering centers, glide scattering centers and anisotropic scattering centers. Also we conclude that all of them make the image blur by research on their display on imaging.Aim to eliminate the blur in imaging, time-frequency method are used. It can be used in imaging process as well as do with the image.At last, we analyze the image resolution and scattering's anisotropy under wide-aperture imaging. Under wide-aperture, the anisotropy of scattering centers become evidence, In this paper, we propose a new algorithm based on sub-aperture and filtered back-projection algorithm to estimate the anisotropy of scattering centers in wide-aperture imaging.