新型扩张状态观测器及其噪声抑制的特性分析

A novel nonlinear state observer and its characteristic analysis of restraining noise

为了提升对快变干扰的估计性能,把输出估计误差的非线性项和切换项作为反馈设计一种新型非线性扩张状态观测器.在对干扰具有相同的估计性能下,新型非线性扩张状态观测器的增益相对较小,因而该新型非线性扩张状态观测器比传统扩张状态观测器拥有更好的噪声抑制性能。仿真结果表明新型扩张状态观测器对干扰的估计误差是传统方法的1/4。

In order to improve the estimation performance of fast-varying interference,a novel nonlinear extended state observer(NNESO)is developed by using the nonlinear and switching terms of the output estimation error as feedback.Under the same performance of estimating interference,the observer gains of NNESO are relatively smaller compared with traditional extended state observer.Therefore,smaller observer gains give NNESO better effect on sensor noise suppression compared with traditional extended state observer(ESO).The simulation result shows that the estimation error of NNESO is a quarter of that of traditional methods.