Chaotic Synchronization Control And Its Application In Secure Communication

Chaotic phenomena widely exist in the objective world. An important achievement in nonlinear science is the understanding of chaos phenomena. In recent years,chaos are widely studied and applied in secure communication, which has important academic significance and application value. However , the theory of chaotic control and synchronization is still very unripe presently and there are a lot of problems on theory and technology need to be resolved. The research of it is mainly limited within the attempt under the ideal circumstance such as noise-free and parameter match. This dissertation mainly deals with chaotic synchronization, its control and application in non-ideal situation.First, this dissertation reviews the development trend and current research situation of chaotic synchronization and its application of secure communication. It also introduces the basic concepts,main feature and research method of chaos. This paper researches deeply several method of synchronization, which includes PC synchronization method, observer control method, feedback synchronization method, impulsive synchronization method, self-adapt synchronization method. In addition, appropriate simulation is made and realized synchronization of different structure chaotic systems based on adaptive simulation.Secondly, the paper discussed error estimation of synchronization of chaotic systems under noisy circumstance. The simulation is made whose result show that this method is effective. Then it studies the adaptive anti-synchronization of Lorenz System in noisy and parameter-unmatched situation. It designs the corresponding controller and adaptive laws based on the noise that is boundaries in practical environments, which is proved by the numerical simulation can make chaos systems achieve synchronization within noise.Finally, the research fruits are applied to the secure communication based on the chaos synchronization. In addition, the paper designs a secure communication scheme based on observer and feedback. These two kinds of methods are feasible, which is proved by the numerical simulation, and find that the method based on observer under the same noise is better than the anti-noise property of method based on feedback.