系统辨识中，一个很重要的方法是用相关分析法辨识脉冲响应，该程序可以计算出输入和输出序列的互相关函数，以及计算出脉冲响应估计值-system identification, a very important way is to analyze the identification impulse response, the program can calculate the input and output sequence of cross-correlation function, and c