中文摘要：

针对应答脉冲信号的混扰现象影响二次雷达询问机解码的问题,提出了一种基于和差单脉冲天线以及二次雷达信号代数性质的二次雷达信号盲分离新算法。该算法通过分析二次雷达信号的ZCM（零/恒模）特性,采用了一种用于二次雷达信号分离的代价函数,进而由代价函数最小值对应的单脉冲比求解得到混合矩阵和分离矩阵,最终实现二次雷达信号的盲分离。仿真结果表明,当信噪比不低于20 d B时,该算法无需任何先验条件可有效分离出二次雷达信号。

英文摘要：

A blind source separation algorithm of SSR signals based on sum-difference monopulse antenna and algebraic property is proposed,which can overcome the problem of decoding errors of Secondary Surveillance Radar（SSR）due to the presence of garble.Firstly,the algorithm proposes a cost function for separating SSR signals by means of analyzing the Zero/Constant Modulus（ZCM）property of SSR signals.Then the algorithm finds the mixture matrix and weight matrix by using the monopulse ratio associated with the minimum value of cost function.Finally the algorithm separates the SSR signals with the weight matrix.The numerical simulation results show that the algorithm can separate the SSR signals effectively without any prior conditions when SNR is higher than 20 d B.