Synthetic Aperture Radar Target Feature Transformation Method Based on Random Code Phase-switched Screen

As a novel passive device, phase-switched screen (PSS) imposes phase modulation onto the radar signal and has been extensively applied in radar target stealth. Recently, the blanket jamming method based on PSS is proposed against synthetic aperture radar (SAR). However, the method still remains challenging to obtain the desired jamming effect because it suffers from insufficient energy when the reflectivity of the reflector is not enough or the protected area is too large. In this paper, a target feature transformation method based on PSS is proposed to counter SAR. The method attaches the PSS material to the protected target surface and utilizes one-dimensional (1-D) or two-dimensional (2-D) random code PSS modulation to dynamically control the reflected signal. As a result, the generated target image is defocused and turned into some strip-shaped or square-shaped areas when modulated signal is received and processed by the victim radar system. The target feature is transformed greatly and cannot be detected by radar. Moreover, the shape of the generated area can be flexibly controlled by the code width and inter-pulse modulating frequency. Simulations and experimental results are utilized to verify the effectiveness of the proposed method.