基于Chirplet变换和压缩感知的空中颤振目标稀疏成像

摘要

针对在逆合成孔径雷达( ISAR )成像过程中目标非合作性机动导致的方位孔径稀疏现象与目标主体颤振引起的微多普勒效应相叠加对成像造成的影响，建立了颤振目标稀疏ISAR成像模型，分析了孔径稀疏和目标颤振对成像造成的影响，提出了一种基于Chirplet变换和压缩感知( CS)重构的成像方法，获得了颤振目标的高质量成像结果。仿真实验验证了该方法的有效性。%In the process of Inverse Synthetic Aperture Radar ( ISAR) imaging, the superposition of the phenomenon of sparse azimuth aperture caused by the uncooperative target maneuvering and the micro-Doppler effect caused by extensive fluttering in the target leads to further interference on imaging. To solve this problem, the sparse ISAR imaging model of a fluttering target is established, then the influence of sparse of aperture and fluttering on imaging is analyzed. A sparse aperture ISAR imaging method for flutte-ring target is proposed, which is based on Chirplet transform and Compressed Sensing ( CS) reconstruc-tion. The high quality imaging results of the fluttering target can be obtained by using the method. Simula-tions show the effectiveness of the proposed method.