基于场景欺骗的景象匹配末制导干扰策略

Scene-deception-based jamming strategy of scene matching terminal guidance

现代电子对抗领域中,对弹载合成孔径雷达(synthetic aperture radar,SAR)的景象匹配末制导系统产生持续有效的干扰是一个巨大的挑战。针对这一问题,本文研究了基于连续回波模拟的组合干扰策略来克服它。通过分析SAR的距离多普勒成像原理,并依据快速频域回波模拟算法,逆向地生成与掩护目标一致的虚假场景回波;通过剖析景象匹配的末制导过程中的薄弱环节,使用双通道干扰机释放可调干信比的模拟回波,形成连续图像帧的场景欺骗和压制干扰效果,以对导引头产生诱导;利用干扰机的平台照明特性,对不同通道的压制信号和欺骗信号强度进行适配来实现最优的干扰效能。数值仿真结果表明,本文提出的干扰决策方法对弹载SAR的景象匹配末制导系统有较好的破坏效果。

In the field of modern electronic countermeasures,it is a huge challenge to generate continuous and effective jamming to the scene matching terminal guidance system of missile-borne synthetic aperture radar(SAR),thus a combinational jamming strategy based on continuous echo simulation is designed to overcome it.According to the fast frequency-domain echo simulation algorithm,the false scene echoes consistent with the covering target are generated reversely by analyzing the range Doppler imaging principle of SAR.By analyzing the anti-jamming weakness in the process of scene matching terminal guidance,a dual-channel jammer is used to release the simulated echoes with adjustable jamming-signal-ratio(JSR),so as to produce reasonable guidance for the seeker based on deceptive scenes and suppressive noise in successive image frames.The platform illumination effect of jammer is used to decide the suppression jamming and deception jamming signals’strength from different channels to achieve optimal jamming efficiency.The simulation results reveal that the proposed approach has a good disruptive effect on the scene matching terminal guidance system of missile-borne SAR.