说明：  已知d(n)=0.8d(n-1)+w(n),w(n)为高斯白噪声，方差为0.36,x(n)=d(n)+v(n),v(n)为方差为1的白噪声
(Known d (n) = 0.8d (n-1)+ w (n), w (n) is white Gaussian noise with variance 0.36, x (n) = d (n)+ v (n), v ( n) is the variance of white noise 1)