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 for least squares parameter estimation. Identification parameters obtained after operation: A1 = -1.4981, A2 = 0.7038, B1 = 1.0476, B2 = 0.4704