合成孔径雷达-地面动目标指示(SAR-GMTI)系统通常采用多个通道对杂波和干扰进行抑制和对消,传统的合成孔径雷达(SAR)噪声调频压制干扰难以对SAR-GMTI实施有效干扰。文中针对多通道SAR-GMTI提出基于运动干扰站的相干噪声调频干扰。该方法利用运动干扰站转发式干扰的成像特性实现方位向扩展,利用方位向相干噪声调频实现距离向扩展,将二者有机结合,可同时实现干扰目标在方位向和距离向的二维扩展。研究结果表明:该方法可获得部分方位向处理增益,有效降低了干扰功率需求,对SAR和SAR-GMTI均可产生灵活可控的干扰条带,可同时保护地面分布式静止目标和运动目标。理论分析和仿真实验验证了该干扰方法的可行性和有效性。

Synthetic aperture radar-ground moving target indication (SAR-GMTI) systems usually use multiple channels to suppress clutter and jamming signals, and the traditional jamming method for synthetic aperture radar (SAR) is invalid for SAR-GMTI, so a new jamming method against multi-channel SAR-GMTI is proposed, that is coherent noise frequency modulation jamming based on moving jamming station. The repeater jamming imaging feature of moving jamming station is used to realize azimuth extension, and the azimuth coherent noise frequency modulation is used to realize range extension, so the combination can realize 2-D extension of jamming targets in range and azimuth. The research results show that the method can obtain part of azimuth processing gain and effectively reduce the demand for jamming power, so it can produce flexible and controlled 2-D jamming stripe for SAR and SAR-GMTI, and protect the ground moving targets and stationary targets at the same time. Theoretical analysis and computer simulation justify the validity and efficiency of the proposed jamming method.

TN974