基于杂波扩展的STAP投散射干扰方法

A Scattered Wave Jamming Method Against STAP Based on Clutter

空时自适应处理技术(STAP)在机载预警雷达中应用广泛,对其干扰的研究具有重要意义。针对传统相干干扰方法采用主瓣对主瓣的方式截获雷达信号易被发现的问题,提出一种基于杂波扩展的干扰方法。干扰机位于雷达副瓣,截获雷达杂波信号而非直达波信号作为相干干扰信号的来源,采取投散射的方式实施干扰,实现对雷达的主瓣干扰。推导了干扰机接收到的雷达直达波和雷达杂波功率的计算公式,建立了杂波信号模型和干扰信号模型,通过仿真比较了干扰机接收到的雷达直达波和雷达杂波的功率,验证了截获杂波信号的可行性,与伪杂波干扰进行了仿真对比。仿真结果表明:相比于伪杂波干扰,该干扰方法对目标先验信息准确性要求较低,干扰后在方位和多普勒频率上均形成假目标,故该方法可行有效。

Space-time adaptive processing(STAP)is widely used in airborne early warning radar.For this,the study of its interference is of great significance.A jamming method based on clutter is proposed.Being easy to be detected by using a main-lobe to main-lobe way to intercept radar signals by conventional coherent jamming methods,a jammer is located in the side-lobe of the radar to intercept the clutter signal rather than the direct signal as the source of the coherent jamming signal.The jamming is carried out by scattering to realize the main lobe jamming.The calculation formulas of radar direct wave power and radar clutter power received by the jammer are derived.A clutter signal model and a jamming signal model are established.Through simulation,the power of radar direct wave and radar clutter received by the jammer are compared,and the feasibility of clutter signal interception is verified,and compared with pseudo clutter jamming through simulation.The simulation results show that compared with the pseudo clutter jamming,the proposed method has a lower requirement for the accuracy of the prior information of the target,is feasible,and effective to the false targets formed in both azimuth and Doppler frequency after jamming.