Time-Varying Reflectivity Modulation on Inverse Synthetic Aperture Radar Image Using Active Frequency Selective Surface

Interrupted-sampling repeater modulation (ISRM) can generate multiple virtual target images by sampling and forwarding radar signals to confront the inverse synthetic aperture (ISAR). However, repeating delay is unavoidable system complex. Moreover, numerous works mainly discuss ISAR image deception based on periodic modulation, effect relatively limited. Active frequency selective surface (AFSS) perform intermittent amplitude reflected signal varying reflectivity, thus, it achieve function of ISRM. In this paper, possibility AFSS applied in generation discussed, an image-modulation method proposed. The periodically modulated which accomplished AFSS-loaded PIN diodes. On basis, modulating randomly varied a slow time domain. When processed system, produced unfocused cannot be recognized radar. Simulation results are utilized demonstrate effectiveness proposed method.