帶有數(shù)據(jù)丟失的混沌保密通信系統(tǒng)采樣同步控制研究
[Abstract]:Chaotic system is a kind of extremely complex nonlinear system. Chaotic signal has the characteristics of natural concealment, extreme sensitivity of initial value, unpredictability, similar noise and so on, so it is very suitable for application in secure communication system. In recent years, with the rapid development of digital computer technology, sampling control has attracted wide attention. However, in the actual sampling control system, there are often some phenomena such as data loss of controller and random uncertainty of sampling period, which will seriously affect the performance of the system and even destroy the stability of the system. Therefore, this paper focuses on the loss of sampling data and synchronization control of random sampling periods in chaotic secure communication systems. The main contents of this paper are as follows: firstly, under multiple random sampling periods, the strategy of maintaining input is adopted to solve the synchronization control problem of drive-response chaotic system with control data loss. The data loss is transformed into the input delay of the system, and the error system is transformed into the time-delay system by the input-time-delay method to analyze the stability of the system. The controller gain can be solved by linear matrix inequality (LM [) method. The effectiveness of the controller design is verified by numerical simulation and it is verified that the synchronization system can be well applied to the chaotic secure communication system. Secondly, the zero input strategy is adopted to solve the synchronization problem of random sampling chaos with data loss of controller. The switched system with data loss is described as a class of switched delay systems with stable and unstable subsystems by means of the switched system method and the input delay method. The exponential stability of the system is analyzed based on the mean resident time method. At the same time, the relationship between the system performance and the data loss rate is discussed. From the numerical simulation, it can be concluded that the lower the data loss rate, the shorter the synchronization time between the two chaotic systems. At the same time, the simulation results show that the proposed synchronization control method can be well applied to chaotic secure communication systems. Thirdly, aiming at the synchronization control problem of the directed complex network with data loss, the strategy of maintaining input is adopted, and the sampling feedback synchronization controller is designed for all nodes, and the sufficient conditions for the synchronization of the complex network are obtained. Taking the directed complex network with 10 Lorenz nodes as an example, the numerical simulation verifies that there is no controller data packet loss in all nodes, some node controllers lose packets at the same time, and the controller does not lose packets at the same time. The simulation results show that the designed controller can make the system stable, that is, the effectiveness of the designed controller is verified. Similarly, it is verified that the chaotic masking technique can cover up and restore useful signals well. Finally, the research work of this paper is summarized, and the direction of further research is put forward.
【學(xué)位授予單位】:東北大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類(lèi)號(hào)】:TN918;O415.5
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