存在指向误差时的稳健自适应波束形成算法

针对期望信号方向存在指向误差的情况，提出了一种稳健的波束形成算法，通过对期望信号导向矢量进行旋转的方法，用新的导向矢量产生自适应加权，这样当期望信号落入波束主瓣的边缘时，依然可以保持系统输出信干噪比基本不变，提高了算法的稳健性，并给出了旋转角度选择的依据．该算法形成的自适应加权对不存在指向误差时的性能没有影响．计算机仿真结果验证了该算法的有效性。

Robust adaptive beamforming against pointing error

A novel robust adaptive beamforming algorithm is proposed for situations when the estimated direction of the desired signal is not accurate. A new steering vector is generated by rotating the steering vector of the signal estimated, which can be used to generate an adaptive weighted value. When the direction of the desired signal is at the edge of mainlobe, this method can still keep the system output signal-to-noise and interference ratio (SNIR) almost constant, which increases the robustness of the algorithm. Another method proposed here can determine the needed rotation angle value by analyzing the bandwidth of the mainlobe. When there is no direction error, the proposed method does not affect the performance of antenna array. Computer simulations verify the efficiency of this method.