ML法能够很好的估计信号的信噪比,IMC-PID是利用内模控制原理来对PID参数进行计算，最大信噪比的独立分量分析算法。- ML estimation method can be a good signal to noise ratio, The IMC- PID is using the internal model control principle for PID parameters is calculated, SNR largest independent component analysis algorithm.