【作者】 张社；

【导师】 翁贻方；

【作者基本信息】 北京工商大学 ， 控制理论与控制工程， 2005， 硕士

【摘要】 本文旨在用智能控制的理论和方法设计特性良好的混沌同步控制方案,并基于DSP进行混沌同步语音保密通信的研究。首先简要分析了现有混沌同步的主要智能控制方案和混沌同步用于保密通信的研究进展状况,指出目前用于混沌同步的主要智能控制方案从控制策略的角度讲多属于微扰反馈控制,并将其归纳为几个主要的发展方向。在此基础上,分别对遗传算法、模糊控制、T-S模糊模型在混沌同步控制中的应用进行了研究。用遗传算法对一类同步控制器参数进行了优化,利用遗传算法强大的并行搜索能力,选取合理的适应度函数,寻得使同步效果明显改进的控制参数;针对连续变量反馈同步法(CVFS)中反馈系数整定的困难,提出将其模糊化的思想,根据已有的经验,设计模糊控制器对其进行实时改变,取得了较好的同步效果;用T-S模糊模型描述混沌系统,推导出两同构混沌系统的误差状态方程,采用并行分配补偿(PDC)法确定同步控制器结构,将同步系统的稳定性约束条件归结为一个求解线性矩阵不等式(LMI)的问题,由此构造出一种结构简单、便于实现的同步控制器。最后基于DSP进行了混沌同步在语音保密通信中的应用研究,设计了混沌频谱的改进方法,使改进后的频谱特性完全符合掩盖语音信号的要求。采用TI提供的TMS320C5402 DSK应用板构建了单工的混沌语音保密通信系统,完成了语音信号的实时采集、加密、传输、解密和播放的软件设计,并针对发送端与接收端DSK核心处理芯片存在晶振偏差所引起的同步误差积累问题提出了“定时强制”同步法,将同步误差稳定控制在一定范围之内,保证了语音通信的质量。更多还原

【Abstract】 This thesis is for the purpose of designing good-performanced chaos synchronization controller with intelligent control theory and method, and also studying the application of chaos synchronization to secure speech communication based on DSP. First of all, most existing methods of chaos synchronization through intelligent control as well as the development of secure communication through chaos synchronization are briefly analyzed, and the conclusion is made that most intelligent control methods used in chaos synchronization are based on slightly disturbed feedback control from the standpoint of control policy, and they can be sorted into several development trends.Based on this, an investigation is made into the application of genetic algorithm(GA), fuzzy control and T-S fuzzy model to chaos synchronization. GA is used to optimize parameters of a kind of synchronization controller, with its strong ability in parallel searching and a proper choice of adaptability function, optimized parameters can be found which greatly improve synchronization results. In order to overcome the difficulty of parameter-adjusting in Continuous Variable Feedback Synchronization (CVFS), the idea of fuzzifying its parameters is put forward. According to existing experience, a fuzzy controller is designed to change control parameters momentarily, which leads to a better result. T-S fuzzy model is used to describe chaotic systems, and error state equations of two chaotic systems of the same form can be deduced. Using parallel distributed compensation(PDC) to determine the structure of synchronization controller, the stability conditions of error system can boil down to a problem of Linear Matrix Inequality(LMI). In this way, a synchronization controller with simple structure and easy completion is obtained.Finally, a study of the application of chaos synchronization to secure speech communication based on DSP is carried out. Chaotic signal is pretreated in order to meet the requirements of masking speech signal, and a simplex system of secure speech communication is constructed with TMS320C5402 DSK provided by Texas Instruments. The software of sampling, encryption, transmission, decryption and broadcasting of speech signal is designed, meanwhile, the“timing compulsion synchronization”is presented to solve the更多还原