针对传统四通道主瓣干扰抑制单脉冲测角技术在同时存在主副瓣压制式干扰时不再适用的问题,提出一种基于特征投影预处理的自适应单脉冲测角算法。首先,利用特征投影预处理滤除采样信号中的主瓣干扰;然后,利用预处理后的采样信号计算约束自适应波束形成的权值来抑制回波信号中的旁瓣干扰,并形成四通道单脉冲系统;最后,对四个通道中的信号进行四通道主瓣干扰抑制单脉冲测角技术。仿真实验表明:所提算法在主瓣干扰和多个旁瓣干扰同时存在的情况下,可达到良好的目标角度估计性能。

When both mainlobe and sidelobe barrage jamming exist, the traditional four-channel mainlobe jamming suppression technique is no longer applicable for monopulse angle measurement. To tackle this problem, an adaptive monopulse angle measurement algorithm is proposed based on eigen-projection matrix preprocessing. Firstly, the eigen-projection matrix preprocessing is used to filter the mainlobe jamming in the sampling signal. Then, to suppress the sidelobe jamming in the echo signals, the adaptive beamforming with constraint is calculated by using the preprocessed sampling signals. Moreover, a four-channel monopulse system is formed. Finally, the monopulse angle measurement technique based on four-channel mainlobe jamming suppression is applied to the signals in the four channels. Simulation results show that the proposed algorithm can achieve good performance in angle estimation when both the mainlobe jamming and multiple sidelobe jamming exist at the same time.

TN973.1