常规虚拟变换技术用于波束形成时,受变换区域影响较大,在区域选择不当时甚至会引起整个方向图的严重畸变,并且零陷也过浅。提出了一种基于加权虚拟阵列的方法,给变换矩阵引入干扰方向信息。利用该方法形成波束时,能稳定地形成对准期望信号,并且有较深的零陷和较好的旁瓣抑制效果。在小快拍数和小阵元数时仍然具有良好的波束保形能力。理论分析和计算机仿真验证了该方法的有效性。
When the virtual array is used for adaptive beamforming,the performance is largely influenced with the transforming area,even the serious distortion of the whole beam map will be aroused if an improper transforming area is chosen,and the "null" is a bit shallow.This paper expressed a method based on weighed virtual array transformation,with the presented algorithm,the interference null can be deeply and steadily formed.Meanwhile,it constrains the side lobe well.Moreover,this method can form a good beam although there are a few snaps and sensors.Numerical examples reveal the correctness and the validity of the proposed algorithm.