提出了一种基于累积量的多用户空间特征估计算法，并将该算法用于智能天线系统中的多用户相干源波达方向（ＤＯＡ）估计．该算法构造了累量域空间特征矩阵，通过对空间特征矩阵的特征分解得到用户信号的空间特征估计．基于空间特征的估计，利用前后向平滑空间特征协方差矩阵估计共信道多用户信号的ＤＯＡ，并将各用户的ＤＯＡ自动分组．仿真实验验证了算法的有效性． A multi-user spatial feature estimation algorithm based on cumulant is proposed and used to estimate DOA in multi-user coherent sources in smart antenna system. The algorithm constructs the spatial domain feature matrix of the cumulant domain, and obtains the spatial feature estimation of the user signal through the feature decomposition of the spatial feature matrix. Based on the spatial feature estimation, DOA of co-channel multi-user signals is estimated by using the covariance matrix of forward-backward smoothing spatial features, and the DOA of each user is automatically grouped. Simulation results show the effectiveness of the algorithm.