EM Scattering Center Model-Guided Passive SAR Deception Using Diverse Frequency Time-Modulation

An electromagnetic (EM) metasurface is a passive device capable of manipulating the reflected signal of a radar in both spatial and frequency domains. This article presents a novel analytical design of EM scattering center model-guided passive synthetic aperture radar (SAR) deception based on diverse frequency time modulation. The objective of this design is to disguise the real target as an intended deceptive target and conceal its original EM characteristics. To achieve this, we first extract the scattering center model of an intended deceptive target and express its SAR image analytically. The SAR image is determined by the number, amplitude, and position of the scattering center. Subsequently, we derive the SAR image of a metasurface modulated on fast and slow time scales with diverse frequencies, establishing the relation between the modulation parameters and the resulting SAR image properties. By comparing and aligning the SAR images between the scattering center model and the modulated metasurface with a predetermined similarity threshold, we successfully accomplish scattering center model-guided SAR deception. The simulated results demonstrate that the SAR image similarities of both the scattering center model and modulated metasurface exceed 0.9, indicating the effectiveness of this method as an electronic countermeasure.