基于子空间跟踪的波束形成算法

Improved Beamforming Algorithm Based on Subspace Tracking

在期望信号方向发生变化或未知的情况下,为了获得较理想的波束形成,基于ESPRIT(借助旋转不变技术估计信号参数)方法,借助受限摄动子空间跟踪算法,提出了一种改进的波束形成算法.由于该算法采用子空间跟踪技术,对期望信号导向矢量能实时跟踪,从而能抑制时变信号的指向误差.计算机仿真结果表明,该算法获得的结果与已知期望信号方向理想情况下的波束形成结果相近.

Based on the ESPRIT (estimating signal parameter via rotational invariance techniques) method, an improved algorithm for beamforming was proposed by utilizing the subspace tracking algorithm in perturbation analyses to obtain ideal beamforming under the condition that the direction of expected signals is unknown or changed. In this algorithm, real-time tracking for the direction vector of the expected signals is realized due to the application of the subspace tracking algorithm, as a result, the pointing error of time-varying signals can be controlled. Numerical simulations show that beamforming obtained using the improved algorithm approaches to the beamforming under the ideal condition that the direction of the expected signals is known.