预报误差法参数辨识-松弛的思想，是学习PCA特征提取的很好的学习资料，各种kalman滤波器的设计，供做算法研究人员参考，仿真效率很高的。-Prediction Error Method for Parameter Identification- the idea of relaxation, Is a good learning materials to learn PCA feature extraction, Various kalman filter design, Algorithm