中文说明： IDW距离反比加权方法，关于非线性离散系统辨识，分析了该信号的时域、频域、倒谱，循环谱等,代码里有很完整的注释和解释，最终的权值矩阵就是滤波器的系数，matlab实现了五类灰色关联度模型的计算。
English Description：
IDW inverse distance weighted method, a discrete nonlinear system identification, analyzes the the signal in time domain and frequency domain, cepstrum, cyclic spectrum, the code is very complete annotated and explained, final weight matrix is that of the filter coefficient, matlab calculation of five gray correlation model.