CAJ | 학술논문

线阵三维SAR系统可实现对地面场景的三维成像,是近年来研究的热点,但受载机平台和实际条件的限制,其切航迹向分辨率难以提高.结合三维场景中的目标稀疏特征,提出了一种基于压缩冗余采样的线阵三维SAR超分辨成像方法.相比于匹配滤波成像方法,该方法需要较少的阵元数就可以进行超分辨成像,并且冗余基的采样结构使成像位置更加精确,在抑制旁瓣的同时大大提高了切航迹向的分辨率.仿真实验证明了算法的有效性.
선진삼유SAR계통가실현대지면장경적삼유성상,시근년래연구적열점,단수재궤평태화실제조건적한제,기절항적향분변솔난이제고.결합삼유장경중적목표희소특정,제출료일충기우압축용여채양적선진삼유SAR초분변성상방법.상비우필배려파성상방법,해방법수요교소적진원수취가이진행초분변성상,병차용여기적채양결구사성상위치경가정학,재억제방판적동시대대제고료절항적향적분변솔.방진실험증명료산법적유효성.
Linear array SAR system is a research focus in recent years,and can realize three-dimensional imaging of ground scene,But its resolution of the cross flight trace direction is difficult to improve due to the limitation of the airborne platform and the actual conditions. A linear array 3D SAR super-resolution imaging method based on the redundant compressive sampling is proposed in this paper according to the sparsity characteristics of targets in 3D scene. Compared with the matching filter imag-ing method,the proposed method exploits the less antenna elements to achieve the super-resolution imaging,and the redundant based sampling structure makes the imaging location more accurate. In short,meanwhile the sidelobe is suppressed,the resolu-tion in cross flight-trace direction is improved. Simulation results demonstrate the validity and accuracy of the proposed algorithm.