说明：  一个UCA-RB-ESPRIT的程序。通过波束空间变换，获得导向矢量的平移不变性，从而用ESPRIT实现DOA估计。
(A UCA-RB-ESPRIT program. Through the beam-space transformation, to obtain the steering vectors of translation invariance, and thus to achieve with the ESPRIT DOA estimates.)