DESIGN CONSIDERATIONS FOR ELECTRONIC CHAOS CONTROLLERS

We analyze general possibilities of electronic implementations of chao s controllers. We consider in particular two classes of chaos controll ers: those based on the OGY approach, and occasional proportional feed back (OFF) controllers. Influence of accuracy of digital implementatio n of the OGY algorithm and its partial hardware implementation is disc ussed in detail. We describe which parts of the algorithm can be imple mented in hardware and how to build a feedback controller with compute r-assisted goal determination. As a second task, we consider the OPF c ontroller introduced by Hunt for stabilizing periodic solutions in aut onomous chaotic systems. Its original version has a major drawback bec ause it requires an external synchronizing signal. We describe a modif ied version of Hunt's controller which obviates the need for an extern al synchronizing signal. Advantages and disadvantages of both methods from the implementation point of view are discussed in detail. (C) 199 8 Elsevier Science Ltd. All rights reserved.