从协方差矩阵估计角度出发 ,解释了有限次快拍下造成自适应波束形成性能下降和自适应波束畸变的原因 .有限次快拍等效增加了干扰之间、干扰与噪声之间以及噪声之间的相关性 ,造成自适应波束形成性能下降 .同时 ,有限次快拍下噪声等效为色噪声 ,文中分析了色噪声环境下自适应波束畸变机理 ,指出色噪声是自适应波束畸变的根本原因 From the perspective of covariance matrix estimation, the reasons for the degradation of adaptive beamforming performance and adaptive beamforming caused by finite sub-snapshots are explained. The limited sub-snapshots effectively increase the interference between interference, noise and noise , The adaptive beamforming performance is reduced.At the same time, the noise under the limited snapshot is equivalent to the color noise.The mechanism of adaptive beam distortion under color noise environment is analyzed in this paper, and it is pointed out that the color noise is the fundamental of adaptive beamforming the reason