A TYPE OF NONLINEAR FILTER——BEING ABLE TO IDENTIFY STATES AND PARAMETERS SIMULTANEOUSLY

It is essential for building precise nonlinear control system to exactly and fast identify state and parameter of nonlinear dynamic system simultaneously.In this paper some mistakes in reference1 are pointed out, and an improved nonlinear filter is proposed.It can be used to identify the state and parameter of the system simultaneously.The effectiveness of the filter is proved by computer simulation.