阻塞矩阵方法对消主瓣干扰

Mainlobe interference cancelling method via block matrix

当存在主瓣干扰且有期望信号混入情况下,用常规自适应波束形成方法进行自适应干扰对消,不但会引起主瓣变形,而且期望信号也会被抑制,从而影响对消性能。提出一种新的阻塞矩阵方法,对接收数据进行预处理,消除它们对计算数据协方差阵的影响,再用其它方法确定自适应权值。理论分析和计算机仿真表明,用阻塞矩阵方法可以获得较大的性能提升。

When target signal is in the sample data, the performance of adaptive digital beamformer （ADBF） will be degraded. If the interference falls into rnainlobe, the rnainbearn will be distorted with conventional ADBF. A new block matrix（NBM） method is proposed which preprocesses the sample data via a block matrix so that the influence of signal-of-interest（SOI） and mainlobe jamming is diminished. This method avoids mainlobe distortion and has the better performance of interference cancelling than,the direct sample matrix inversion （SMI） method. The results of simulation support the theoretical predictions.