中文说明：
基于均匀线阵，利用四阶累积量产生虚拟阵元，可估计出比真实阵元数更多的信号源，已达到DOA估计的目的，且具有较好的分辨率。
English Description：
Based on the uniform linear array, the fourth-order cumulant is used to generate virtual array elements, which can estimate more signal sources than the real array elements. The purpose of DOA estimation is achieved, and the resolution is better