Observer based on ISM

Abstract

In this chapter the concept of output ISM observer for systems with matched unknown inputs is developed. It is shown that using the output as a sliding mode surface one can compensate the unknown inputs. Then if the number of the inputs is more than the number of unknown outputs it is still possible to observe the system. Moreover, the main advantage of such observers is that they can provide, theoretically, an exact value of the state variables right after the initial time moment.