A new asymptotic polynomial observer to synchronization problem

Reduced‐order fractional integral observer for synchronisation and anti‐synchronisation of fractional‐order chaotic systems

“…In this case, the chaotic system is taken as a ‘master’ and an observer is designed, which estimates the dynamics of its unknown states by means of its output; this is why the observer is known as ‘slave’ system. Different kinds of observers have been used as slave systems, such as the Luenberger [11, 12], high‐gain [13], adaptive [14], reduced‐order [15], polynomial [16] and bounded error [17]. Recently, the differential algebraic approach has been used for the design of reduced‐order observers [18].…”