MIMO雷达非严格正交信号单脉冲测角方法

Monopulse Angle Measurement of Non-Strictly Orthogonal Signals for MIMO Radar

MIMO雷达发射正交信号波形时,可以在接收端匹配滤波后使用单脉冲和差波束比幅测角技术测量发射角(DOD)。现在讨论的正交信号一般都是严格正交的,而实际中发射信号往往非严格正交,文中将从定义上区别这两种信号。当发射信号非严格正交时,会严重恶化单脉冲测角方法中左、右、和三个波束的形状,给这种测角方法带来较大的测量误差。针对这一问题,通过分析发射信号间的互相关矩阵特性,找出了误差产生的原因,并提出了相应的解决方法,实现了这种方法下发射角的高精度测量,最后通过仿真验证了所提方法的有效性。

MIMO radar can use the monopulse angle measurement with amplitude comparison of sum and difference beams behind the matched filtering to measure the direction of departure（DOD） when trans- mitting orthogonal signals. Generally, the orthogonal signals are strictly orthogonal. However, they are more likely to be non-strictly orthogonal in {act. Here we will distinguish them from their definitions. When the signals are non-strictly orthogonal, the shapes of the left, right, and centre beams in the monopulse angle measurement method will be deteriorated seriously, and that will bring large errors to this method. Through analysis of the cross-correlation matrix of signals, we find the error reasons and propose a solving method to achieve the high accuracy measurement of this algorithm. The simulation results verify the effectiveness of the proposed method.