联合协方差矩阵重构与导向矢量校正的稳健波束形成方法

摘要

针对强期望信号和导向矢量失配同时存在时,波束形成器性能会急剧下降的问题,提出联合协方差矩阵重构与导向矢量校正的稳健波束形成方法.该方法利用空间功率谱积分重构干扰加噪声协方差矩阵,排除了采样协方差矩阵中的强期望信号分量,通过空间投影方式校正导向矢量,用校正导向矢量和重构矩阵计算最优加权矢量,进而进行波束形成.仿真实验表明,相较于重构协方差矩阵,校正导向矢量等方法,该方法在强期望信号和期望信号导向矢量失配同时存在时具有更好稳健性,在不同信噪比、不同快拍数、不同失配角度时,输出信干噪比性能接近最优波束形成.%In order to avoid sharp performance degradation when strong signal and steering vector mismatch co-exist,a robust beamforming method that joint covariance matrix reconstruction and steering vector calibration was proposed.The proposed method reconstructed interference-plus-noise covariance matrix through power spectrum integration of the interference space,which resulted in the elimination of the desired signal component in covariance matrix.and then adjusted steering vector by space projection.finally combine of the reconstructed covariance matrix with steering vector calibration to obtain the optimal weighted vector to perform beamforming. computer simulations indicate that,compared with methods of reconstructing covariance matrix as well as cali-brating steering vector,this method was more robust when both strong signal and steering vector mismatch oc-curred.And the output signal to interference plus noise ratio(SINR)performance approximated the optimal beamforming method under situations with different input signal to noise ratio(SNR),snapshot and angle mis-match etc.