二阶滑模跟踪微分器与带通滤波器频域分析

Frequency Domain Analysis for the Second Order Sliding Mode Tracking Differentiator and the Band-Pass Filter

简要介绍了二阶滑模跟踪微分器的基本原理，应用描述函数法对其频率特性进行了分析。在此基础上设计了带通滤波器并对其频率特性进行了分析，给出了二阶滑模跟踪微分器及由其所构成带通滤波器的参数选择和调试方法。仿真结果表明，通过适当选取有关设计参数，带通滤波器能够从几种频率合成信号中提取出特定频率的信号。

The basic theory of the second order sliding mode tracking differentiator was introduced, and its frequency characteristic was analyzed by describing function. On this basis a band-pass filter was designed andits frequency characteristic was analyzed. The methods for choosing and adjusting the parameters of the second order sliding mode tracking differentiator and the band-pass filter were summarized. Simulation results showedthat, if proper parameters were chosen, the band＇pass filter would select the required signal with specific frequency from the compounded signals.