An Inverse Synthetic Aperture Radar Image Modulation Method Based on Coding Phase-Switched Screen

Multiple false target images deception is an effective strategy to protect vital military targets from detection and recognition by inverse synthetic aperture radar (ISAR). Previous research about it focuses mainly on the interrupted-sampling and sub-Nyquist sampling repeater jamming based on digital radio frequency memory (DRFM). The digital image synthesis (DIS) technique or scatter-wave modulation is used to simulate electromagnetic scattering of the real target. However, it is difficult to realize due to the high reconnaissance accuracy requirement and a heavy computational burden. Moreover, the protected target remains in the same location and the false targets' amplitude envelope based on periodic modulation is relatively fixed, which is not conducive to deception. In this paper, an ISAR image modulation method based on coding phase-switched screen (PSS) is proposed against ISAR. The method uses the target bait made of PSS or attaches the PSS to the protected target surface to impose phase modulation onto the reflected signal. As a result, multiple false target images with verisimilar properties are formed around the protected target position when the reflected signal is received and processed by the victim ISAR. Besides, the protected target is concealed and the flexible amplitude control of false targets is achieved. The simulation results are performed to verify the effectiveness of the proposed method.