Implementation issues for electronic chaos controllers

Possibilities of electronic implementations of chaos controllers are analyzed. We consider only such controllers which exploit specific properties of chaotic systems: sensitive dependence on initial conditions and existence of unstable periodic orbits embedded within the attractor. Two classes of chaos controllers are taken into account: 1) based on the Ott-Grebogi-Yorke (OGY) approach (1990); and 2) occasional proportional feedback (OPF) controllers. The influence of accuracy of digital implementation of the OGY algorithm and its partial hardware implementation are discussed in detail. We describe which parts of the algorithm can be implemented in hardware and how to build a feedback controller with computer assisted goal determination. Furthermore, we consider the OPF controller introduced by Hunt (1996). Modifications and improvements of Hunt´s controller are discussed