【作者】 种小庆；

【导师】 卢辉斌；

【作者基本信息】 燕山大学 ， 通信与信息系统， 2010， 硕士

【摘要】 混沌是指在确定性非线性系统中出现的类似随机的行为,混沌运动的动力学特性可用来描述和量化许多复杂现象,混沌信号具有遍历性、非周期、连续宽带频谱、似噪声的特性,特别适合于保密通信领域。混沌同步的实现为混沌保密通信提供了理论基础,使得混沌同步及其应用研究成为当代相关学科的研究热点。本论文对超混沌同步及其在保密通信中的应用进行了深入研究,主要内容如下:首先,系统地论述了混沌同步及其应用的研究现状,重点研究了驱动-响应混沌同步、基于反馈方法的混沌同步和基于状态观测器方法的混沌同步,采用这三种方法设计了三种同步方案,并对三种方案进行数值仿真分析,可以看到基于状态观测器方法的混沌同步方案具有一定的优越性。超混沌系统的特性使其更适合应用于数字保密通信领域,接下来,设计了一种基于状态观测器方法的超混沌同步方案,并通过数值仿真验证了该方案的正确性及实现混沌同步的有效性。其次,对混沌掩盖、混沌参数调制、混沌键控和混沌扩频进行理论分析,设计了一种基于状态观测器方法的混沌掩盖方案,通过数值仿真,验证了该方案的有效性。并针对传统的混沌掩盖技术存在的不足,设计了一种基于状态观测器的超混沌同步保密通信方案,通过理论推导及数值仿真实验得出,这是一种有效的保密通信方案,且保密性较高。更多还原

【Abstract】 Chaos is a quasi-stochastic phenomenon appearing possibly in definite nonlinear dynamic systems. Chotic motion is a complex nonlinear motion and the chaotic phenomenon has been observed in a lot of real systems.The dynamic properties of chaos signal such as ergodicity, aperiodic, uncorrelated, broadband and noise-like have been proved to be useful for secure communication. The chaotic synchronization is the theory basis of secure communication.The research of the chaotic synchronization and its application becomes a new research focus in nonlinear science fields.The main content of this paper contains the analysis of hyperchaotic synchronization and application of hyperchaotic secure communication. In this dissertation, the main contributions are as follows:Firstly, the application of chaotic synchronization and its current situation is described systematiclly, then three chaotic synchronization schemes are designed with three different methods, which are the drive-response chaotic synchronization, the synchronization method based on feedback and the observer-based synchronization method. Then make numerical simulations with the three schemes, from the results, we can see that the observer-based chaotic synchronization method has more advantages than the others. Hyperchaotic systems have the features with which can make them more suitable for digital secure communications, then, a method based on state observer hyperchaotic program is designed and verified by numerical simulation of the correctness and chaotic synchronization effectiveness.Secondly, three chaotic synchronization methods used for secure communication are in depth study, namely, chaotic masking, chaotic parameter modulation, chaotic shift keying and chaotic spread-spectrum theoretical analysis. A state observer based on chaotic masking method program is designed, through numerical simulation, the effectiveness of the program is demonstrated. Because the traditional chaotic masking technology has some shortcomings, a hyperchaotic observer-based synchronization secure communication scheme is designed, from theoretical analysis and numerical simulation results, we can get that it is an effective secure communication scheme, and has higher confidentiality.更多还原