A Novel Deceptive Jamming Method Against Two-Channel SAR-GMTI Based on Two Jammers

Abstract

The traditional synthetic aperture radar (SAR) deceptive jamming can effectively create false static and moving targets in the SAR image. However, the deceptive capability could be significantly reduced or denied by the two-channel SAR-ground moving target indication (GMTI) system. To achieve the effective deception, the impact of SAR deceptive jamming against two-channel SAR-GMTI system is first analyzed. Then, a novel effective deceptive jamming method based on two jammers is described. Using this method, the two stationary jammers are made to be located at different positions along the azimuth direction. By applying the complex modulation in each jammer, the additional phase term of the synthetic jamming signals in the two coregistered SAR images is canceled. It is shown that the expected modulation coefficient for each jammer can be precisely calculated by solving a linear system of equations of two unknowns. Finally, the proposed deceptive jamming against the two-channel SAR-GMTI system is achieved by generating the jamming signal in each jammer via the efficient deceptive jamming technique. By utilizing the optimal layout of the jammers, this scheme is both robust and computationally efficient. It will generate false static and moving targets with high fidelity in the two SAR images. Only the false moving targets can be detected by the displaced phase center antenna (DPCA) and then relocated to the correct positions by along-track interferometry (ATI) in the two-channel SAR-GMTI system. Some simulations are provided to demonstrate the effectiveness of the proposed method.