基于斜投影算子的引信抗主瓣干扰方法

目的 利用信号极化域信息滤除干扰信号，解决回波阵列期望信号和主瓣干扰信号的入射角一致导致空域滤波抗干扰失效的问题。方法 由于主瓣干扰信号的极化状态通常是未知的，为此提出基于斜投影的抗主瓣干扰方法。该方法利用极化域–空域联合谱多信号分类算法，估计主瓣干扰信号的极化状态。然后，利用期望信号和主瓣干扰信号极化状态的差异，通过构造斜投影算子，处理阵列接收数据，从而滤除主瓣干扰信号。结果 当主瓣干扰导向矢量失配，或者期望信号与主瓣干扰信号的极化状态满足一定程度的差异时，基于斜投影的抗主瓣干扰方法均取得良好效果。结论 基于斜投影的抗主瓣干扰方法具有稳定性好、鲁棒性强等优点，可应用于雷达、无线电引信等系统对主瓣干扰的抑制，提升雷达、无线电引信等系统适应复杂电磁环境的能力。

An Anti-mainlobe Jamming Method for Fuzes Based on Oblique Projection

For the problem that the incidence angle of the expected signal of an antenna array and the mainlobe jamming signal are the same, which leads to the null domain filtering anti-jamming failure, the signal polarization domain information can be used to filter out the jamming, but the polarization state of the mainlobe jamming signal is usually unknown, and for this reason, a polarization array anti-mainlobe jamming method based on oblique projection is proposed. The anti-mainlobe jamming method of polarized array based on oblique projection uses the polarization domain and space domain joint spectral multi-signal classification algorithm to estimate the polarization state of the mainlobe jamming signal. Then, the difference between the polarization state of the desired signal and the mainlobe jamming signal is used to filter out the mainlobe jamming signal by constructing a skew projection operator to process the array received data. The simulation experiments showed that when the mainlobe interference guide vector is mismatched, or when the polarization state of the desired signal and the mainlobe interference signal meet a certain degree of difference, the polarization array mainlobe anti-jamming method based on oblique projection achieves good results. It can be concluded that the anti-mainlobe jamming method of polarization array based on oblique projection achieves good results, with good stability, robustness and other advantages. The method can be applied to radar, radio fuze and other systems to suppress mainlobe interference and improve the ability of radar, radio fuze and other systems to adapt to complex electromagnetic environment.