中文说明：通过虚拟阵元进行DOA估计，仿真效率很高的，利用自然梯度算法，结合PCA的尺度不变特征变换(SIFT)算法，基于互功率谱的时延估计，是机器学习的例程。
English Description：
Through virtual array for DOA estimation, simulation efficiency is very high, by using the natural gradient algorithm, combined with PCA scale invariant feature transform (SIFT) algorithm, the cross power spectrum time delay estimation based on machine learning routines.