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针对一类混沌系统,当不满足观测器匹配条件时,讨论了基于观测器的混沌同步及保密通讯问题.通过设计辅助驱动信号,使得观测器匹配条件得以满足.为了处理辅助驱动信号中的未知变量,使用高增益观测器作为近似微分器,不仅给出了辅助驱动信号的估计值,还给出了辅助驱动信号的微分估计值.基于辅助驱动信号的估计值,提出了一种能与非线性项和干扰影响解耦的降维观测器作为响应系统,达到了与驱动系统的同步.在同步的基础上,再基于辅助驱动信号及其微分的估计值,提出了一种保密信息还原的方法.最后,针对Rssler系统进行仿真,仿真结果表明所提出的方法是有效的.
For a class of chaotic systems, the observer-based chaos synchronization and secure communication problems are discussed when the observer matching conditions are not satisfied. By designing the auxiliary drive signal, the matching conditions of the observer are satisfied. In order to deal with the unknown Variable, using a high-gain observer as the approximate differentiator, not only gives the estimated value of the auxiliary drive signal, but also gives the differential estimate of the auxiliary drive signal.According to the estimated value of the auxiliary drive signal, As the response system, the reduced-dimensional observer which decouples the linear term and disturbance influence is synchronized with the drive system. On the basis of synchronization, based on the estimated value of the auxiliary drive signal and its differential, a reduction of confidential information Finally, the simulation of Rssler system shows that the proposed method is effective.