中文说明：三种经典的MUSIC算法，两种ROOT_MUSIC算法，ESPRIT算法，对远场情况下波达方向的估计，还有对MUSIC算法及其它算法性能的比较
English Description：
Three algorithms for classical MUSIC, two ROOT_MUSIC algorithms, ESPRIT algorithm for DOA estimation under far field conditions, as well as on the performance of MUSIC and other algorithms