对降维STAP机载雷达的延时混叠转发干扰方法分析

针对降维空时自适应处理(space-time adaptive processing, STAP)在不满足独立同分布(independent identical distribution, IID)训练样本的需求时性能严重下降的问题,提出了一种改进的延时混叠转发干扰方法。该方法主要是通过延时混叠协同频率调制,产生多个距离单元分布可控的假目标,成为STAP前向滤波阶段选取的训练样本的一部分,从而破坏训练样本IID的条件,导致形成的空时自适应权产生主瓣畸变,最终无法获得真实的目标信息。仿真结果表明,该方法产生的假目标数目多且距离单元分布可控,降维STAP系统处理性能严重下降。

Analysis of time-delay aliasing transmission jamming method for reduced dimension STAP airborne radar

Focusing on the serious performance degradation of the reduced dimension space-time adaptive processing (STAP) when it fails to meet the demand of independent identical distribution (IID) training samples, an improved time-delay aliasing transmission jamming method is proposed. This method mainly produces multiple false targets with controllable distribution of distance units through time-delay aliasing and frequency modulation, which become part of the training samples selected in the forward filtering stage of STAP. Thus, the condition of IID training samples is destroyed, leading to the main lobe distortion of the space-time adaptive weight, and the real target information cannot be obtained. The simulation results show that the false targets generated by this method are numerous and the distribution of distance units is controllable. The performance of the reduced dimension STAP system is severely degraded.