中文摘要：

设计了一种参数观测器，对不确定Rossler系统中的未知参数进行了识别，采用backstepping方法实现了异结构不确定Rossler系统和Coullet系统之间的混沌同步．根据稳定性原理，确定了同步控制器的结构和控制增益的取值范围．仿真模拟结果表明，在参数观测器和backstepping控制器的共同作用下，Coullet系统所有的状态变量严格地跟踪了不确定Rossler系统的混沌轨迹，从而证明了该观测器和控制器的有效性．

英文摘要：

A parameter observer is designed to identify Rossler system with unknow parameters. Chaos synchronization between uncertain Rossler system and Coullet system is realized via backstepping method. The synchronization controller is presented based on stability theory, and the area of controlling gain is determined. The simulation results show that all the state variables in the Coullet system can track any desired trajectory in the Rossler system exactly when the parameter observer and backstepping controller are functioning,which shows the method is effective and feasible.