基于角度扩展的稳健自适应波束形成算法

Robust adaptive beamformer based on angle spread

导向矢量误差是影响自适应波束形成算法稳健性的关键要素之一,针对该问题提出基于角度扩展的稳健自适应波束形成算法。在期望信号到达角(DOA)给定范围内对导向矢量误差积分求和,展宽方向图主瓣,实现角度扩展。后续采用最陡下降迭代法降低计算复杂度。数值仿真表明,该算法解决了系统性能因导向矢量误差而急剧下降的问题,在小误差情况下,系统性能提高约20%。

Pointing error is one of the key factors that affect the robustness of adaptive beamformer. For this, the robust beamformer based on angle spread was proposed. The directional diagram was spread by computing the integral of pointing vector around the Direction of Arrival （DOA）. Besides, the complexity of algorithm was reduced by adopting steepest descent method. The numerical simulation implies that the proposed method slows down the descent velocity of system performance caused by pointing error. In little error situation, the system performance increases about twenty percent.