超混沌系统滑模自适应同步控制及其在保密通信中的应用

Sliding Mode Adaptive Synchronization Control of Hyperchaotic System and Its Application in Secure Communication

由于混沌系统具有内禀随机性、初值敏感性和宽频谱等特性,利用混沌系统实施保密通信已成为提高信息安全的有效手段.为了进一步改进通信保密性能以及抗干扰能力,该文基于经典的Lorenz系统设计了部分参数时变的四维超混沌系统.将明文信号参与该混沌系统的运算,采用滑模自适应控制方法设计单维信号控制,实现了同结构超混沌系统同步.在达到同步的情况下,接收端能有效地恢复出隐藏信号.数字仿真表明,这种同结构超混沌系统滑模自适应同步控制是有效的.

Due to their intrinsic randomness, sensitivity to initial values and broadband spectrum, chaotic systems have been used to implement secure communication. To improve security and enhance anti-interference ability, a four-dimensional hyperchaotic system with unknown parameter is designed based on the classical Lorenz chaotic system. A single signal control is proposed based on sliding mode adaptive control to synchronize hyperchaotic systems with the same structure. When synchronization is achieved, the hidden signal can be restored effectively at the receiving end. Numeric simulation shows effectiveness of the proposed technique.