中文说明： 复化三点Gauss-lengend公式求pi，插值与拟合的matlab实现，感应双馈发电机系统的仿真，解耦，恢复原信号，关于小波的matlab复合分析，基于互功率谱的时延估计。
English Description：
Matlab realization of PI, interpolation and fitting, simulation of induction doubly fed generator system, decoupling, recovery of original signal, matlab composite analysis of wavelet, time delay estimation based on cross power spectrum.