A Review of ISAR Imaging Technology

With the requirements of radar resolution improving, the aperture of traditional radar has become the bottleneck of its development. In order to overcome this problem, phased array radar and virtual aperture radar are proposed. Virtual Aperture Radar can be divided into Synthetic Aperture Radar (SAR) and Inverse Synthetic Aperture Radar (ISAR). The ISAR has the advantages of all-day, all-weather, long-distance, and high resolution, and is widely used in military and civil fields. This paper first briefly introduces the principle of ISAR imaging, the concepts of range resolution and azimuth resolution, then introduces the common methods of envelope alignment and self-focusing, and finally analyzes several ISAR imaging methods, such as large angle imaging algorithm, compressed sensing imaging algorithm, and micromotion target imaging algorithm.