Abstract: The traditional tracking differentiator will vibrate at high frequency after entering steady state, in order to overcome this phenomenon, an improved algorithm is introduced. The tracking differentiator is modeled and packaged by using S-Function in Matlab / Simulink software, then the simulation experiment analysis is done. Numerical simulation results show that the tracking differentiator using the new comprehensive control function can track the input signal without overshoot and eliminate the high frequency vibration of the differential signal.For the mixed noise signal, it can effectively suppress the noise, restore the initial signal, and has a goodfiltering effect.

Key words: tracking differentiator, S-function, comprehensive control function, wave filtering