阻塞矩阵抗干扰方法性能分析

阻塞矩阵抗干扰方法在阵列抗干扰方面已有较多研究，该方法利用阻塞预处理将主瓣干扰信号去除，之后自适应波束形成处理实现副瓣干扰抑制和主瓣保形，但其抗干扰性能尚缺乏详细分析。文中推导了算法的实现原理，引入抗干扰等效权矢量，并采用阵列输出信干噪比增益指标、抗干扰方向图等对抗干扰性能进行分析，仿真结果表明，当存在主瓣干扰时，该方法会带来副瓣电平增高、主波束变形及偏移等问题，同时还会引起阵列自由度损失，导致抗干扰性能变差。 

Performance Analysis of Anti-jamming Method via Block Matrix

The anti-jamming method via block matrix has been analyzed for array jamming suppression. This method firstly blocks the mainlobe jamming signal, then accomplishes anti-jamming process by adaptive beamforming (ABF), whose performance is still lack of detailed analysis. This paper deduces the algorithm implementation principle, introduces anti-jamming equivalent weight vector and analyzes the anti-jamming performance via the array output signal to interference and noise ratio (SINR) gain index and anti-jamming beam pattern. Finally, simulation results show that for the mainlobe jamming suppression, the block matrix method will suffer much distortion (high sidelobes and distorted mainbeam) and loss of array effective aperture, having worse performance than ABF.