A novel approach for squint InISAR imaging with dual-antenna configuration

The image distortion arises in the Interferometric Inverse Synthetic Aperture Radar (InISAR) three-dimensional (3D) imagery when the radar works in squint-mode. Existing squint InISAR imaging methods suffer from high computational complexity and poor imaging quality due to the vertical Coordinates Transformation (CT) and iterative operations for rectifying the 3D image distortion. To address this issue, we propose an imaging method for squint InISAR with two antennas. Firstly, the cross-range scaling is used to obtain initial horizontal coordinates of the target. Then, the interferometric phase is used to obtain the altitude coordinates of the target, and hence a 3D image of the target is formed. Finally, the CT is applied to rectify the 3D image distortion by correcting the acquired horizontal and vertical and altitude coordinates of the target. The dual-antenna configuration reduces the complexity of the InISAR system. We perform extensive simulations to demonstrate the effectiveness of the proposed dual-antenna squint InISAR imaging method.