混沌系统同步及其在保密通讯中的应用

Synchronization of Chaotic System and its Application in Secret Communication

基于稳定性理论,用自适应控制的方法构造了一个同步系统,实现了对任意传输信号的及时准确恢复.基本方法是:把外界对传输信号的影响等效为一个时变函数,传输信道为时变信道,通过一个直流信号去预测时变信道对传输信号的影响,在接收端用自适应控制器来补偿.并用此方法对CHEN系统进行了数值仿真,结果表明系统能很好地达到同步.该系统应用到保密通讯中,信息信号和混沌信号相加构成混沌传输信号,在接收端信息信号能被有效复原,仿真研究表明该通信方案确实可行.

A synchronizing system is created using the selfadaptive control approach which is based on the stability theory, which can restore timely and accurately any transmitted signal. In this paper, the effect of the environment on the transmitted signal is equated to a time - varied function, the signal - transmitting channel a time - varied signal channel. The effect of time - varied signal channel on the transmitted signal is predicted using the direct current signal and the effect is compensated using self - adaptive control equipment at the part of the receiving. The simulation is conducted for CHEN system and the simulation results show that with the help of the self - adaptive control ap- proach, chaotic system can be synchronized effectively. The method is applied to secret communication. The information signal is added with the chaotic signal to produce the chaotic transmitted signal. The information signal is restored at the part of the receiving effectively. The simulation results indicate that the communication scheme is feasible.