中文说明：
DOA谱估计实值MUSIC算法把复数协方差矩阵映射成实数矩阵来处理，特征值分解计算量降低了75 ，实值music算法可以分辨相干信号源
English Description：
The real music algorithm of DOA spectrum estimation maps the complex covariance matrix to the real matrix, and the computation of eigenvalue decomposition is reduced by 75%. The real music algorithm can distinguish coherent signal sources