系统辨识的输入信号为一个周期的M序列，从 中分离出并显示a1 、a2、 b1、 b2，画出输出观测值z的经线图形，并显示坐标网格-system identification of the input signal for a period of the M sequence, isolated from the show and a1, a2, b1, b2, paint output observation z warp graphics, and display Grid