中文说明：此算法为最小二乘参数估计的递推算法。运行后得到辨识参数：a1= -1.4981， a2= 0.7038， b1= 1.0476， b2= 0.4704。
English Description：
This algorithm is a recursive algorithm of least squares parameter estimation. After running, the identification parameters are obtained: A1 = - 1.4981, A2 = 0.7038, B1 = 1.0476, B2 = 0.4704.