Research On Interferometric Inverse Synthetic Aperture(InISAR)Three-Dimensional Imaging For Space Target

Interferometric Inverse Synthetic Aperture Radar(InISAR)imaging is of great significance for the space target recognition and monitoring.Three-dimensional(3D)images of space targets can be obtained by multiple radar deployments at different locations and motions of targets.However,there are also some problems to be solved in the imaging process,such as the effect of high-speed motion of the target on imaging,ISAR image mismatch and InISAR 3D imaging in the squint model.Aiming at the above problems in interferometric ISAR 3D imaging,this paper starts from the characteristics of high-speed motion of space targets,firstly studies the 2D ISAR imaging of high-speed moving targets.Secondly,before the 3D imaging,the ISAR image registration is studied.Finally,in view of the characteristics of relative squint between the target and the radar,InISAR 3D imaging in squint model is also one of the main research contents.Firstly,ISAR imaging of high-speed targets.According to the characteristics of high-speed motion of space targets,a high-speed moving target echo model is established,and the influence of high-speed motion of the target on ISAR imaging is analyzed.And,then,the high-speed motion compensation is realized by the Chirp Fourier transform,and the high-resolution ISAR image is obtained.Secondly,ISAR image registration method based on wave path difference compensation.The main cause of the ISAR image mismatch is the wave path difference of the radar receiving echoes.For the wave path difference estimation and compensation problem,the rotational angular velocity of the target relative radar is estimated by using the Chirp Fourier transform to obtain the wave path difference.Then,the wave path difference compensation is realized by phase compensation.Finally,the analysis of InISAR 3D imaging performance.Aiming at the characteristics of the relative squint model InISAR imaging,the influence of the squint model on the interference phase is analyzed,and compared with the front view condition,which can be regarded as a special case.