一种宽带零陷展宽恒定束宽波束形成算法

摘要

数字波束形成技术是一种以数字方法来实现波束形成的技术。传统的线性约束最小方差( LCMV)宽带波束形成算法在期望方向上的阵列响应施加等式约束，过多地消耗用于抑制干扰和噪声的自由度，导致阵列天线的输出性能受限、对干扰信号的抑制能力变差。针对传统的LCMV宽带波束形成算法存在的问题，文章提出了一种宽带零陷展宽恒定束宽波束形成算法。该算法在期望方向上的阵列响应施加不等式约束，获得了更高的干扰抑制能力和输出信干比性能；并结合SRV约束，有效简化了在期望方向上的约束条件，获得了更多的自由度；同时使用零陷展宽技术，在干扰方向附近施加线性约束条件，展宽了在干扰方向形成的零陷。最后，通过仿真实验，对算法的性能进行了分析和验证。%Digital beam forming is a beam forming technology using digital method. Traditional robust LCMV wideband beam forming algorithm setting equality constraint in the expected direction of array response would consume the degrees of freedom used to restrain interference and noise too much. This would restrain the output quality of array antenna and debase rejection capacity to interference signal. In order to overcome the weakness of robust LCMV wideband beam forming algo-rithm,this paper proposes a wideband null broadening and constant beam width beam forming method. This method sets ine-quality constraint in the expected direction of array response boosting rejection capacity to interference signal and output SINR quality. Then The SRV constraint is combined to simplify the constraint conditions in the expected direction and get more the degrees of freedom. Meanwhile the null broadening method is used to set linear constraint in the expected direction and broaden the null in the interference direction. Finally,the quality of this method is analyzed and verified in simulation experiment.