为解决近程分布源下引信欺骗干扰抑制问题,提出了联合盲分离和正交投影的抗干扰算法。针对伪码引信,利用接收信号互相关后首个峰值位置构造正交投影矩阵,通过正交投影滤除干扰;针对LFM引信,SMSP干扰与LFM信号的不相关性,先利用盲分离滤出干扰,再用干扰信号构造正交投影向量以得到回波。仿真结果表明,算法具有良好的干扰抑制能力,当SMSP干扰重复周期小于5µs时,分离干扰相似度大于92%,当分离干扰相似度大于82%时,正交投影后干扰信号即被滤除。

The algorithms based on BSS and orthogonal projection were proposed to solve the problem of deception jamming suppression under near-field sources. First, the orthogonal projection matrix was constructed using the first peak position after the received signals' matched filtering for the PN fuze, so the deception jamming can be filtered out using orthogonal projection algorithm; and for the LFM fuze, the jamming was separated using BSS to construct orthogonal projection matrix according to their independence, so the echo was received using the same principle. Simulation results show that the proposed algorithms have good performance, the similarity of separated jamming is greater than 92% when the repeated cycle is smaller than 5 µs, and the jamming can be eliminated when the similarity is greater than 82%.