利用遗忘因子递推最小二乘法做的参数估计，介绍还算详尽-Forgetting factor recursive least squares method using the parameter estimates do

对四阶系统的最小二乘辨识； 其根本思想能表现为新的估计值 是在老的估计值 的基础上修正而得的(Least squares identification of fourth order system; Its fundamental idea can be expressed as a new estimate is based on the old estimate based on the revised)