Synthetic Aperture Radar Image Modulation Using Phase-Switched Screen

Synthetic aperture radar (SAR) image modulation is an effective method to protect a target of interest, and thus receives intensive attention. Currently, it still remains challenging to design an image modulation method capable of both flexibility and diversity in a passive way. In this letter, a two-dimensional (2-D) image modulation method based on phase-switched screen (PSS) is proposed against the SAR. The method imposes phase modulation onto the radar reflected signal by the PSS so that 2-D multifalse targets with verisimilar characteristics are formed around the protected target position when received and processed by the victim radar receiver. The theoretical analysis indicates that the amplitude and position of the generated multifalse targets are precisely controlled by the PSS modulating parameters. Moreover, the protected target is concealed and cannot be detected by radar. Simulations and experimental results are conducted to illustrate the validity of the proposed method.