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针对一类不确定混沌系统,在观测器匹配条件不满足的前提下,讨论了基于观测器设计的混沌同步及其基于混沌同步的保密通讯问题.首先基于相对阶的概念,构造了辅助驱动信号,使混沌系统针对该辅助驱动信号满足观测器匹配条件.接着设计能直接消去非线性项和未知干扰影响的降维观测器作为响应系统来达到混沌同步.然后设计高阶高增益滑模观测器估计辅助驱动信号及微分项.将上述方法应用于保密通讯,提出一种信息还原的方法.最后,针对Ro¨ssler混沌系统进行仿真,结果表明了该方法的有效性.
Aiming at the chaotic system of a class of uncertainties, the observer-based chaos synchronization and its secure communication based on chaos synchronization are discussed under the condition that the observer matching conditions are not satisfied.Firstly, based on the concept of relative order, an auxiliary drive signal , So that the chaotic system satisfies the observer matching conditions for the auxiliary driving signal.And then, a dimension-reduced observer that can directly eliminate the influence of nonlinear terms and unknown interference is designed as the response system to achieve the synchronization of chaos.Then the design of high-order high-gain sliding mode observer Estimate auxiliary driving signal and differential term.According to the Ro¨ssler chaotic system, the method is applied to the secure communication and a method of information reduction is proposed.Finally, the simulation results show the effectiveness of the proposed method.