In this letter, we focus on the high-resolution imaging of ship targets under sparse aperture condition and its application in three-dimensional (3D) imaging. A bi-static high-resolution algorithm dealing with the sparse echo condition is proposed, which consists of the following processing steps: (1) A side-lobe apodization–multiple orthogonal least-square method is proposed to recover the complete signal and reduce the influence of side-lobe at the same time, which enhances the precision of phase extraction in interferometric inverse synthetic aperture radar (InISAR) imaging; (2) The bi-static configuration is used to accentuate the relative motion between the target and radar, such that the requirement for long coherence processing time can be avoided and (3) The 3D InISAR technique is employed to obtain the 3D images of the ship targets. Experiments with simulated and real data are utilized to demonstrate the effectiveness of the proposed method.

在这封信中，我们将重点放在稀疏孔径条件下的舰船目标高分辨率成像及其在三维（3D）成像中的应用。提出了一种处理稀疏回波条件的双静态高分辨率算法，该算法包括以下处理步骤：（1）提出了一种旁瓣切趾-多正交最小二乘法，以恢复完整信号并减少信号的失真。同时影响旁瓣，从而提高了干涉式反向合成孔径雷达（InISAR）成像中相位提取的精度；（2）使用双基地配置来强调目标与雷达之间的相对运动，从而避免了对长相干处理时间的要求，并且（3）使用3D InISAR技术获得了目标的3D图像。运送目标。