A Complex Intrapulse Modulation Jamming Scheme for Spaceborne SAR

Jamming for synthetic aperture radar plays an important role in electronic countermeasures. Currently, there are many jamming methods, but each method has its own issues. Barrage jamming has the drawbacks of requiring high power and being easy to detect, while deceptive jamming faces issues such as inadequate real-time performance and the need for multiple parameters estimated with high precision. An intrapulse modulation jamming scheme with a novel jamming effect is proposed to ameliorate these issues. First, in the sidelobe, jamming parameters and optimal jamming weights are calculated by estimated parameters combined with the backscattering coefficient of the region of interest (ROI). Second, based on the jamming parameters, multiple intrapulse modulations are simultaneously applied to the received ROI echo. Then, the modulated signals are transmitted with corresponding optimal weighting power and superimposed with the original echo, leading to the damage of the ROI imaging results. Finally, the utilization of relatively low-power Gaussian noise for suppression resulted in complete covering of the target in the ROI. This scheme improves the real-time performance of generating jamming signals and significantly reduces the power required for noise for suppression. It analyzed that even in the presence of forwarding power errors and inadequate real-time performance; there will still be a significant jamming effect. Results of simulations and measured data validate that the proposed scheme can effectively destroy image information.