当输入由白噪声产生的随机信号时，使期望输出和实际输出之间的均方根误差达到最小的线性系统。一种以状态变量的线性最小方差递推估算的方法。-When the input generated by the random white noise signal, the desired output and actual output of the RMS error to a minimum between the linear system. A kind of state variables of t