基于噪声乘积调制的SAR-GMTI间歇采样干扰方法

为阻止合成孔径雷达地面动目标显示(synthetic aperture radar-ground moving target indication, SAR-GMTI)对地面运动目标的侦察, 提出了基于噪声乘积调制的间歇采样灵巧干扰方法。该方法在间歇采样的基础上, 辅之以噪声乘积调制, 在保证干扰机天线收发隔离的同时, 仅通过离线模板设计, 即可灵活高效地产生多假目标欺骗和密集性假目标遮盖的不同干扰效果。该方法调制过程首先对截获信号进行间歇采样, 然后与线下调制好的噪声模板进行乘积, 建立了干扰模型, 推导了对SAR和SAR-GMTI的干扰效果, 详细阐述了侦察误差对性能的影响。理论分析和仿真表明, 所提方法可有效弥补单一间歇采样干扰生成的假目标分布规律明显、易于辨识的缺陷, 拓展干扰的作用范围, 干扰效果灵活多变。

Jamming method of intermittent sampling against SAR-GMTI based on noise multiplication modulation

In order to prevent the reconnaissance of synthetic aperture radar-ground moving target indication (SAR-GMTI) to moving targets on the ground, a smart jamming method of intermittent sampling based on noise multiplication modulation is proposed. Combining the intermittent sampling jamming with noise multiplication modulation, the jamming method can not only guarantee transceiver isolation, but also efficiently produce different effects of multiple target deception and dense target cover by the offline template design. The process performs intermittent sampling firstly, and then multiplys product modulation with the designed template. The jamming signal model is established and the interference effect on SAR and SAR-GMTI is analyzed, the influence of reconnaissance error on performance is explained. The results show that the proposed method can make up for the defect of intermittent sampling effectively, whose distribution of false target is regular and distinguishable. The jamming scope is expanded and the jamming result is flexible.