Multitarget Barrage Jamming Against Azimuth Multichannel HRWS SAR via Phase Errors Modulation of Transmitted Signal

The high-resolution and wide-swath (HRWS) mode in azimuth multichannel systems has been widely used in current on-orbit and future spaceborne synthetic aperture radar (SAR) systems. It is crucial to explore jamming methods for these systems. This letter proposes a jamming method for HRWS SAR that can flexibly produce controllable barrage effects on multiple targets simultaneously. First, a position modulation function is designed based on a reconstruction method for the azimuth multichannel HRWS SAR system. This function modulates the intercepted signal, allowing for flexible control of periodic jamming positions. Next, a coverage modulation function is designed. The intercepted signal is then modulated by this coverage modulation function, enabling control over the coverage of noise-like jamming. Finally, the modulated signal is retransmitted by the jammer, creating a flexibly controllable periodic multitarget barrage jamming effect in the SAR image. In both point target and area target simulation experiments, quantitative comparisons of the position control factor and coverage control factor show that the experimental results align with theoretical analysis and deductions, verifying the effectiveness of the proposed method in the azimuth multichannel HRWS SAR system.